Showing posts with label Earth. Show all posts
Showing posts with label Earth. Show all posts

Sunday, December 13, 2015

The annual Geminid meteor shower peaks tonight, Dec. 13-14, as Earth passes through a stream of gravelly debris from "rock comet" 3200 Phaethon


by Dr. Tony Phillips.

GEMINID METEOR SHOWER--TONIGHT!


The annual Geminid meteor shower peaks tonight, Dec. 13-14, as Earth passes through a stream of gravelly debris from "rock comet" 3200 Phaethon. Dark-sky observers in both hemispheres could see as many as 120 meteors per hour during the dark hours between midnight and sunrise on Dec. 14th. Last night, Dec. 12-13, NASA's all-sky meteor network detected 15 Geminid fireballs over the USA. That number will surely grow on peak night--tonight! Got clouds? Listen for Geminid echoes in the audio feed from our live meteor radar.



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Geminids meteor shower prediction: Moonless and marvelous
 
 
  • Geminids meteor shower is peaking
  • Geminid meteors can flash into view anywhere in the night sky

(Sky and Telescope)The nights of December 13-14 offer dark skies for a popular, underappreciated meteor display.

The Geminid meteor shower competes with August's Perseids for showiness — yet it's not nearly as well-known. The Geminids are easier on your sleep schedule, too. Their radiant (near Castor in Gemini) climbs as high by 11 p.m. standard time (45 degrees above the local horizon) as the Perseid radiant does by 2 a.m. daylight time on the peak Perseid nights. The higher the radiant, the more meteors you'll see.

The Geminid meteors can flash into view anywhere in the late-night sky when the shower peaks in mid-December. But if you follow their paths back far enough, they all appear to diverge from a point in the constellation Gemini.
The International Meteor Organization (IMO) predicts that the Geminids should reach an impressive zenithal hourly rate of 120 this year. (ZHR is how many meteors you'd see see per hour in a very dark sky if the radiant were at the zenith. This year the peak should be centered on roughly 18h Universal Time on December 14. Unfortunately, that's 1 p.m. EST and 10 a.m. PST. So in North America the shower's performance is likely to be similar on the nights of December 13-14 and 14-15.
 
As the IMO notes, "Near-peak Geminid rates persist for almost a day, so much of the world has a chance to enjoy something of the shower's best." In addition, "mass-sorting within the stream means fainter telescopic meteors should be most abundant almost a day ahead of the visual maximum," and the meteors after maximum are typically brighter than average.

The moon will be a waxing crescent a few days old, no trouble at all.



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Sunday, November 29, 2015

In the last few weeks NASA has revealed the overall amount of ice has increased at the Antarctic and the amount of sea ice has also extended. ANTARCTIC temperatures have cooled over the past six years, study finds.




GLOBAL WARMING? NASA says Antarctic has been COOLING for past SIX years

ANTARCTIC temperatures have cooled over the past six years, according to US space agency NASA.

 

 
PUBLISHED: 07:51, Sat, Nov 28, 2015 | UPDATED: 12:58, Sat, Nov 28, 2015
 
Heimdal Glacier in southern Greenland, in an image captured on Oct. 13, 2015, from NASA Langley Research Center's Falcon 20 aircraft flying 33,000 fee 

NASA

Heimdal Glacier southern Greenland, from NASA's Falcon 20 aircraft at 33,000 feet above sea level.
An intensive scientific study of both Earth's poles has found that from 2009 to 2016 overall temperature has dropped in the southern polar region.NASA’s Operation IceBridge is an airborne survey of polar ice and has finalised two overlapping research campaigns at both the poles.In the last few weeks NASA has revealed the overall amount of ice has increased at the Antarctic and the amount of sea ice has also extended.Coupled with the latest announcement of slight cooling in the area, it has fuelled claims from climate change deniers that human industrialisation is not having the huge impact on global tenperature as often is claimed.
 
 
Map showing the extent of ice during the NASA studies 
NASA
Map showing the extent of ice during the NASA studies

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Examiner.com

New paper claims no pause in warming, but unaltered data says otherwise

November 25, 2015 9:20 AM MST
Authors Naomi Oreskes (L) and Erik Conway attend the 'Merchants of Doubt' premiere during the 2014 Toronto International Film Festival.
Photo by Aaron Harris

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Next: How NOAA rewrote climate data to hide global warming pause

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Nasa Earth Observatory

Earth is Cooling…No It’s Warming



In 1967 Hansen went to work for NASA’s Goddard Institute for Space Studies, in New York City, where he continued his research on planetary problems. Around 1970, some scientists suspected Earth was entering a period of global cooling. Decades prior, the brilliant Serbian mathematician Milutin Milankovitch had explained how our world warms and cools on roughly 100,000-year cycles due to its slowly changing position relative to the Sun. Milankovitch’s theory suggested Earth should be just beginning to head into its next ice age cycle. The surface temperature data gathered by Mitchell seemed to agree; the record showed that Earth experienced a period of cooling (by about 0.3°C) from 1940 through 1970. Of course, Mitchell was only collecting data over a fraction of the Northern Hemisphere—from 20 to 90 degrees North latitude. Still, the result drew public attention and a number of speculative articles about Earth’s coming ice age appeared in newspapers and magazines.


Graph of Northern Hemisphere temperatures, 1860 through 1970

Initial efforts to observe Earth’s temperature were limited to the Northern Hemisphere, and they showed a cooling trend from 1940 to 1970 (jagged line). Scientists estimated the relative effects of carbon dioxide (warming, top curve) and aerosols (cooling, bottom curve) on climate, but did not have enough data to make precise predictions. (Graph from Mitchell, 1972.)


But other scientists forecasted global warming. Russian climatologist Mikhail Budyko had also observed the three-decade cooling trend. Nevertheless, he published a paper in 1967 in which he predicted the cooling would soon switch to warming due to rising human emissions of carbon dioxide. Budyko’s paper and another paper published in 1975 by Veerabhadran Ramanathan caught Hansen’s attention. Ramanathan pointed out that human-made chlorofluorocarbons (or CFCs) are particularly potent greenhouse gases, with as much as 200 times the heat-retaining capacity of carbon dioxide. Because people were adding CFCs to the lower atmosphere at an increasing rate, Ramanathan expressed concern that these new gases would eventually add to Earth’s greenhouse effect and cause our world to warm. (Because CFCs also erode Earth’s protective ozone layer, their use was mostly abolished in 1989 with the signing of the Montreal Protocol.)



 
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This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric CO2 has increased since the Industrial Revolution. (Source: [[LINK||http://www.ncdc.noaa.gov/paleo/icecore/||NOAA]])
This graph, based on the comparison of atmospheric samples contained in ice cores and more recent direct measurements, provides evidence that atmospheric CO2 has increased since the Industrial Revolution. (Credit: Vostok ice core data/J.R. Petit et al.; NOAA Mauna Loa CO2 record.)
 
The Earth's climate has changed throughout history. Just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 7,000 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives.

Scientific evidence for warming of the climate system is unequivocal.
- Intergovernmental Panel on Climate Change

The current warming trend is of particular significance because most of it is very likely human-induced and proceeding at a rate that is unprecedented in the past 1,300 years.1
 
Earth-orbiting satellites and other technological advances have enabled scientists to see the big picture, collecting many different types of information about our planet and its climate on a global scale. This body of data, collected over many years, reveals the signals of a changing climate.



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The evidence for rapid climate change is compelling:


  • Republic of Maldives: Vulnerable to sea level rise
    Photograph by Shahee Ilyas  
    Malé, capital of Maldives  Wikipedia.org

    Sea level rise

    Global sea level rose about 17 centimeters (6.7 inches) in the last century. The rate in the last decade, however, is nearly double that of the last century.4
    + expand
     
     

  • Global temperature rise

    All three major global surface temperature reconstructions show that Earth has warmed since 1880.5 Most of this warming has occurred since the 1970s, with the 20 warmest years having occurred since 1981 and with all 10 of the warmest years occurring in the past 12 years.6 Even though the 2000s witnessed a solar output decline resulting in an unusually deep solar minimum in 2007-2009, surface temperatures continue to increase.7
     
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  • Warming oceans

    The oceans have absorbed much of this increased heat, with the top 700 meters (about 2,300 feet) of ocean showing warming of 0.302 degrees Fahrenheit since 1969.8
     
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  • Flowing meltwater from the Greenland ice sheet

    Shrinking ice sheets

    The Greenland and Antarctic ice sheets have decreased in mass. Data from NASA's Gravity Recovery and Climate Experiment show Greenland lost 150 to 250 cubic kilometers (36 to 60 cubic miles) of ice per year between 2002 and 2006, while Antarctica lost about 152 cubic kilometers (36 cubic miles) of ice between 2002 and 2005.

    + expand
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News release reports , Earth's magnetic field is not about to flip. Disputing reports of over 1 year ago stating the contrary




 

Earth's Magnetic Field is Not About to Flip, Like Previously Thought

First Posted: Nov 24, 2015 11:09 AM EST
 
Magnetic Field
(Photo : Huapei Wang, with source files courtesy of NASA's Earth Observatory/NOAA/DOD)
 
Earth's magnetic field is not about to flip. While the intensity of this field has weakened in the last couple hundred of years, researchers have found that this doesn't mean it's about to reverse.
 
Humans have lived through dips in magnetic field intensity before. However, there are debates about whether reversals of the magnetic field in the distant past had any connection to species extinctions. Today, a magnetic field reversal would have a huge impact due to one very important thing: technology. The magnetic field deflects the solar wind and cosmic rays. This means that with a weaker field, more radiation gets through which can disrupt power grids and satellite communications.
 
"The field may be decreasing rapidly, but we're not yet down to the long-term average," said Dennis Kent, one of the researchers, in a news release. "In 100 years, the field may even go back the other direction [in intensity]."


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Scientific American

Earth's Magnetic Field Flip Could Happen Sooner Than Expected

Changes measured by the Swarm satellite show that our magnetic field is weakening 10 times faster than originally predicted, especially over the Western Hemisphere
 
Changes measured by the Swarm satellite
Changes measured by the Swarm satellite over the past 6 months shows that Earth's magnetic field is changing. Shades of red show areas where it is strengthening, and shades of blue show areas that are weakening.
Credit: ESA/DTU
Earth's magnetic field, which protects the planet from huge blasts of deadly solar radiation, has been weakening over the past six months, according to data collected by a European Space Agency (ESA) satellite array called Swarm.
 
The biggest weak spots in the magnetic field — which extends 370,000 miles (600,000 kilometers) above the planet's surface — have sprung up over the Western Hemisphere, while the field has strengthened over areas like the southern Indian Ocean, according to the magnetometers onboard the Swarm satellites — three separate satellites floating in tandem.

The scientists who conducted the study are still unsure why the magnetic field is weakening, but one likely reason is that Earth's magnetic poles are getting ready to flip, said Rune Floberghagen, the ESA's Swarm mission manager. In fact, the data suggest magnetic north is moving toward Siberia.
"Such a flip is not instantaneous, but would take many hundred if not a few thousand years," Floberghagen told Live Science. "They have happened many times in the past."[50 Amazing Facts About Planet Earth]



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Wednesday, November 18, 2015

Earth Approaching Objects : November 18th, 2015




 

All Sky Fireball Network

 

by Dr. Tony Phillips.


Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on Spaceweather.com.
On Nov. 17, 2015, the network reported 38 fireballs.
(23 sporadics, 9 Northern Taurids, 3 Leonids, 2 November I Draconids, 1 omicron Eridanid)
In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]

Near Earth Asteroids


Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
On November 18, 2015 there were 1634 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2015 VR64
Nov 12
3 LD
14 m
2015 VV105
Nov 13
9 LD
10 m
2015 VU65
Nov 14
5.2 LD
23 m
2015 VY105
Nov 15
0.09 LD
7 m
2015 VN105
Nov 16
5.5 LD
13 m
2015 VD105
Nov 16
7.2 LD
52 m
2015 VC106
Nov 18
7 LD
24 m
2005 UL5
Nov 20
5.9 LD
390 m
2015 VE66
Nov 21
7.5 LD
64 m
2015 VO142
Nov 24
1 LD
7 m
2015 VH2
Nov 24
12.9 LD
14 m
2003 EB50
Nov 29
48.8 LD
2.2 km
2007 BG29
Dec 1
54.1 LD
1.1 km
2015 VZ145
Dec 8
9.2 LD
81 m
1998 WT24
Dec 11
10.9 LD
1.1 km
2011 YD29
Dec 24
9.7 LD
24 m
2003 SD220
Dec 24
28.4 LD
1.8 km
2008 CM
Dec 29
22.8 LD
1.5 km
2004 MQ1
Jan 2
55.4 LD
1.1 km
1999 JV6
Jan 6
12.6 LD
410 m
Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.

A magnetic filament on the sun erupted hurling inky-black fragments of itself into space. CME expected this week.




by Dr. Tony Phillips.

GLANCING-BLOW CME EXPECTED THIS WEEK:

 

A magnetic filament on the sun erupted during the late hours of Nov. 15th, hurling inky-black fragments of itself into space. Shortly thereafter, a CME was observed racing away from the sun:



Storm track models from NOAA suggest that the CME will deliver a glancing blow to Earth's magnetic field on Nov. 18th or 19th. There is a 70% chance of polar geomagnetic storms when the CME arrives.

Actually, the arrival of the CME could be the second strike. A co-rotating interaction region (CIR) is also expected to hit Earth's magnetic field on Nov. 18th. CIRs are transition zones between fast- and slow-moving solar wind streams. Solar wind plasma piles up in these regions, producing density gradients and shock waves that do a good job of sparking auroras.

The double impact, CIR followed by CME, could produce a G1 or G2-class geomagnetic storm and bright auroras around the Arctic Circle. Observers in northern-tier US states from Maine to Washington should be alert for colorful lights in the midnight sky


Thursday, November 5, 2015

It Rains Fireballs - Earth is Passing Through a Stream of Debris from Comet Encke

nemesis maturity

Tuesday, November 3, 2015

Earth approaching objects - November 3rd, 2015

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Image Source  NASA
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All Sky Fireball Network

By Dr. Tony Phillips.


Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on Spaceweather.com.
On Nov. 2, 2015, the network reported 37 fireballs.
(22 sporadics, 14 Northern Taurids, 1 Orionid)


In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]

Near Earth Asteroids
Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.
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  Earth approaching objects (objects that are known in the next 30 days)
Object NameApporach DateLeftAU DistanceLD DistanceEstimated Diameter*Relative Velocity
(2010 UJ7)02nd November 20150 day(s)0.158261.622 m - 49 m13.31 km/s47916 km/h
(2015 TG238)03rd November 20151 day(s)0.186572.676 m - 170 m12.02 km/s43272 km/h
(2015 TD179)03rd November 20151 day(s)0.027110.635 m - 78 m10.12 km/s36432 km/h
(2009 LD)05th November 20153 day(s)0.139754.415 m - 34 m9.49 km/s34164 km/h
(2002 XY38)05th November 20153 day(s)0.082832.270 m - 160 m8.85 km/s31860 km/h
(2015 TM143)06th November 20154 day(s)0.069026.851 m - 110 m6.37 km/s22932 km/h
(2015 TL143)06th November 20154 day(s)0.065725.670 m - 160 m8.57 km/s30852 km/h
(2008 VA15)06th November 20154 day(s)0.075029.251 m - 110 m5.47 km/s19692 km/h
(2008 WQ2)08th November 20156 day(s)0.067926.437 m - 82 m8.45 km/s30419.999999999996 km/h
(2012 HG8)08th November 20156 day(s)0.192474.9310 m - 680 m19.44 km/s69984 km/h
138852 (2000 WN10)10th November 20158 day(s)0.125949.0240 m - 540 m13.78 km/s49608 km/h
(2010 XC15)10th November 20158 day(s)0.150858.7140 m - 310 m12.75 km/s45900 km/h
(2005 UN)12th November 201510 day(s)0.155060.318 m - 39 m8.59 km/s30924 km/h
(2000 WP19)15th November 201513 day(s)0.058622.880 m - 180 m10.43 km/s37548 km/h
(2012 LA11)16th November 201514 day(s)0.067826.416 m - 36 m4.88 km/s17568 km/h
(2009 WN6)18th November 201516 day(s)0.108742.331 m - 68 m10.02 km/s36072 km/h
(2015 TO178)18th November 201516 day(s)0.091335.533 m - 75 m6.19 km/s22284 km/h
413577 (2005 UL5)19th November 201517 day(s)0.01535.9240 m - 540 m18.99 km/s68364 km/h
(2002 VV17)19th November 201517 day(s)0.158261.6270 m - 590 m10.26 km/s36936 km/h
(2005 UJ6)20th November 201518 day(s)0.158061.5130 m - 300 m17.60 km/s63360.00000000001 km/h
(2005 EW169)21st November 201519 day(s)0.094036.6400 m - 900 m8.90 km/s32040 km/h
(2015 RQ82)23rd November 201521 day(s)0.073928.797 m - 220 m8.24 km/s29664 km/h
(2011 YS62)23rd November 201521 day(s)0.091535.6310 m - 680 m14.10 km/s50760 km/h
(2009 WB105)24th November 201522 day(s)0.038515.058 m - 130 m18.88 km/s67968 km/h
(2010 YC1)26th November 201524 day(s)0.194875.8150 m - 330 m14.08 km/s50688 km/h
(2004 BG41)26th November 201524 day(s)0.077030.035 m - 78 m10.25 km/s36900 km/h
(2012 XA133)26th November 201524 day(s)0.113444.1180 m - 390 m26.99 km/s97164 km/h
(2011 HJ7)26th November 201524 day(s)0.089334.8100 m - 230 m13.57 km/s48852 km/h
(2015 LE21)27th November 201525 day(s)0.112643.831 m - 68 m3.71 km/s13356 km/h
163696 (2003 EB50)28th November 201526 day(s)0.125448.81.4 km - 3.1 km23.68 km/s85248 km/h
(2007 EA26)28th November 201526 day(s)0.111543.4210 m - 470 m8.19 km/s29484 km/h
(1999 VN6)29th November 201527 day(s)0.186572.6350 m - 780 m12.33 km/s44388 km/h
345722 (2007 BG29)30th November 201528 day(s)0.139054.1670 m - 1.5 km11.26 km/s40536 km/h
(2014 WM7)30th November 201528 day(s)0.079631.051 m - 110 m10.08 km/s36288 km/h
(2005 XT77)01st December 201529 day(s)0.167965.3180 m - 390 m9.70 km/s34920 km/h
1 AU = ~150 million kilometers,1 LD = Lunar Distance = ~384,000 kilometersSource: NASA-NEO
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Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.

Swedish photographer captures sprawling sunspot complex, finds a spaceship hiding among its dark cores








 

Sunspot AR2443 is so big, it is attracting the attention of astrophotographers around the world. Earlier today when Peter Rosén of Stockholm, Sweden, photographed the sprawling complex, he found a spaceship hiding among its dark cores. Seriously. Take a close look at the image below:




Can't find the spaceship? Click here and here. "It is the International Space Station," explains Rosén. "I caught it making a split-second transit of the giant sunspot."

Indeed, AR244 is huge. From end to end it measures almost 200,000 km. Many of the dark cores are as large as terrestrial continents--and a couple are as large as Earth itself. These dimensions make it an easy target for backyard solar telecopes.

Of greater interest is the sunspot's potential for explosive activity. The spotty complex has a 'beta-gamma' magnetic field that harbors energy for strong M-class solar flares. Any such explosions will be geoeffective as the sunspot turns squarely toward Earth in the days ahead.

Wednesday, October 14, 2015

A gigantic hole in the sun's atmosphere has opened up and a broad stream of solar wind is flowing out of it.







 
A gigantic hole in the sun's atmosphere has opened up and a broad stream of solar wind is flowing out of it. This is called a "coronal hole." It is the deep blue-colored region in this extreme UV image from NASA's Solar Dynamics Observatory:




Coronal holes are places in the sun's atmosphere where the magnetic field unfurls and allows solar wind to escape. In the image above, the sun's magnetic field is traced by white curving lines. Outside the coronal hole, those magnetic fields curve back on themselves, trapping solar wind inside their loops. Inside the coronal hole, no such trapping occurs. Solar wind plasma is free to fly away as indicated by the white arrows.

For much of the next week, Earth's environment in space will be dominated by winds flowing from this broad hole. This should activate some beautiful Arctic auroras. NOAA forecasters estimate a 65% of polar geomagnetic storms today as Earth moves deeper into the solar wind stream.


Tuesday, September 29, 2015

Something is Affecting the Entire Solar System

 

 

 

 

 

nemesis maturity

Thursday, May 22, 2014

All Sky Fireball Network - May 20th, 2014

All Sky Fireball Network


Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on Spaceweather.com.
On May. 20, 2014, the network reported 8 fireballs.
(8 sporadics)
In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]

Near Earth Asteroids


Potentially Hazardous Asteroids (PHAs) are space rocks larger than approximately 100m that can come closer to Earth than 0.05 AU. None of the known PHAs is on a collision course with our planet, although astronomers are finding new ones all the time.

On May 21, 2014 there were 1475 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:
Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.


Asteroid
Date(UT)
Miss Distance
Size
2010 JO33
May 17
4 LD
43 m
2014 KD
May 19
7.7 LD
57 m
2014 KD2
May 20
5.2 LD
41 m
2005 UK1
May 20
36.7 LD
1.1 km
1997 WS22
May 21
47.1 LD
1.5 km
2002 JC
May 24
48.7 LD
1.4 km
2014 HQ124
Jun 8
3.3 LD
620 m
2011 PU1
Jul 18
7.6 LD
43 m
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Notes: LD means "Lunar Distance." 1 LD = 384,401 km, the distance between Earth and the Moon. 1 LD also equals 0.00256 AU. MAG is the visual magnitude of the asteroid on the date of closest approach.
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