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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 307.6 km/sec
density: 0.2 protons/cm3
explanation | more data
Updated: Today at 2342 UT
X-ray Solar Flares
6-hr max: B4
1758 UT Apr10
24-hr: B5
1612 UT Apr10
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 10 Apr 11
None of these sunspots poses a threat for strong solar flares. Credit: SDO/HMI
Sunspot number: 56
What is the sunspot number?
Updated 09 Apr 2011

Spotless Days
Current Stretch: 0 days
2011 total: 1 day (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Since 2004: 820 days
Typical Solar Min: 486 days

Updated 09 Apr 2011


The Radio Sun
10.7 cm flux: 105 sfu
explanation | more data
Updated 09 Apr 2011

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 4.0 nT
Bz: 0.7 nT south
explanation | more data
Updated: Today at 2343 UT
Coronal Holes: 10 Apr 11
A solar wind stream flowing from the indicated coronal hole could brush against Earth's magnetic field during the next 48 hours. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2011 Apr 10 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
01 %
01 %
CLASS X
01 %
01 %
Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at: 2011 Apr 10 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
35 %
20 %
MINOR
05 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
40 %
25 %
MINOR
10 %
01 %
SEVERE
05 %
01 %
 
Sunday, Apr. 10, 2011
What's up in space
 

Metallic photos of the sun by renowned photographer Greg Piepol bring together the best of art and science. Buy one or a whole set. They make a stellar gift.

 
Metallic pictures of the Sun

AROUND THE BEND: A coronal mass ejection (snapshot) observed today by the SOHO spacecraft heralds the approach of an active region to the Earthside of the sun. The source of the blast is currently located behind the sun's northeastern limb, but solar rotation will turn it in our direction in the days ahead.

AURORAS IN MOTION: So far, April has been a good month for Northern Lights. Almost every night, bright auroras have been dancing around the Arctic Circle--really dancing. Click on the arrow to view a 5 MB video of auroras in motion over Quebec's Lagrande river on April 7th:

To make the video, photographer Michel Tournay (pictured above) assembled more than 800 pictures taken with his Nikon D3s. "I especially like the moment where the aurora became very intense for a few seconds showing some smoke on the river," says Tourney. "Normally I would have edited out that part because the aurora was over exposed, but I wanted to show how the scenery got illuminated by it!"

More auroras are possible tonight. NOAA forecasters estimate a 40% chance of geomagnetic activity during the next 48 hours, when a solar wind stream is expected to buffet Earth's magnetic field. A coronal mass ejection (movie) detected by NASA's STEREO probes on April 9th could also reach Earth and contribute to a possible display on April 11th. Aurora alerts: voice, text.

April 2011 Aurora Gallery
[previous Aprils: 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002]

SOLAR NEPHELOCOCCYGIA: It's a noun. Nephelococcygia: The act of seeking and finding shapes in clouds. Today in Selsey, UK, Pete Lawrence set up his solar telescope and performed nephelococcygia on the sun. "I think I found a fish," he says.

The fish-shaped form at the base of the image is a cloud of plasma held above the stellar surface by magnetic fields. It looks dark because it is cooler than the inferno below. Readers with solar telescopes are encouraged to monitor this fishy form--and learn to pronounce nephelococcygia.

more images: from Cai-Uso Wohler of Bispingen, Germany


April 2011 Aurora Gallery
[previous Aprils: 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002]

  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 April 10, 2011 there were 1214 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2011 GW9
Apr 6
0.5 LD
--
10 m
2011 GP28
Apr 6
0.2 LD
--
6 m
2011 FT29
Apr 7
6.3 LD
--
38 m
2011 GZ2
Apr 8
2.7 LD
--
26 m
2011 FT53
Apr 9
6 LD
--
34 m
2011 GE
Apr 13
4.8 LD
--
28 m
2011 GP59
Apr 15
1.4 LD
--
60 m
2002 DB4
Apr 15
62.5 LD
--
2.2 km
2011 GJ3
Apr 27
7.7 LD
--
24 m
2008 UC202
Apr 27
8.9 LD
--
10 m
2009 UK20
May 2
8.6 LD
--
23 m
2008 FU6
May 5
75.5 LD
--
1.2 km
2003 YT1
May 5
65.3 LD
--
2.5 km
2002 JC
Jun 1
57.5 LD
--
1.6 km
2009 BD
Jun 2
0.9 LD
--
9 m
2002 JB9
Jun 11
71.5 LD
--
3.2 km
2001 VH75
Jun 12
42.2 LD
--
1.1 km
2004 LO2
Jun 15
9.9 LD
--
48 m
2001 QP181
Jul 2
35.1 LD
--
1.0 km
2011 GA55
Jul 6
62.9 LD
--
1.0 km
2003 YS117
Jul 14
73.9 LD
--
1.0 km
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.
  Essential web links
NOAA Space Weather Prediction Center
  The official U.S. government space weather bureau
Atmospheric Optics
  The first place to look for information about sundogs, pillars, rainbows and related phenomena.
Solar Dynamics Observatory
  Researchers call it a "Hubble for the sun." SDO is the most advanced solar observatory ever.
STEREO
  3D views of the sun from NASA's Solar and Terrestrial Relations Observatory
Solar and Heliospheric Observatory
  Realtime and archival images of the Sun from SOHO.
Daily Sunspot Summaries
  from the NOAA Space Environment Center
Heliophysics
  the underlying science of space weather
Conquest Graphics
  for out-of-this-world printing and graphics
Science Central
   
  more links...
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