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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
SPACE WEATHER
Current conditions
Solar wind
speed: 397.3 km/sec
density: 2.4 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: A0
2340 UT Apr25
24-hr: A0
2340 UT Apr25
explanation | more data
Updated: Today at: 2340 UT
Daily Sun: 25 Apr 09
The sun is blank--no sunspots. Credit: SOHO/MDI
Sunspot number: 0
What is the sunspot number?
Updated 24 Apr 2009

NEW: Spotless Days
Current Stretch: 4 days
2009 total: 101 days (88%)
Since 2004: 612 days
Typical Solar Min: 485 days
explanation | more info
Updated 24 Apr 2009

Far side of the Sun:
This holographic image reveals no large sunspots on the far side of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
What is the auroral oval?
Interplanetary Mag. Field
Btotal: 2.2 nT
Bz: 0.9 nT north
explanation | more data
Updated: Today at 2347 UT
Coronal Holes:
There are no large coronal holes on the Earth-facing side of the sun. Credit: SOHO Extreme UV Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2009 Apr 25 2201 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: 2009 Apr 25 2201 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
05 %
05 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
05 %
05 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
What's up in Space
April 25, 2009

AURORA ALERT: Did you sleep through the Northern Lights? Next time get a wake-up call: Spaceweather PHONE.

 

SATELLITE DECAY: According to US Strategic Command, Iran's Omid satellite reentered Earth's atmosphere today, April 25th, during an 8-hour window centered on 0342 UT. The most likely reentry location is over the south Atlantic Ocean approximately east of Buenos Aires, Argentina. No sightings have been reported.

NOTE: The Safir-2 rocket that launched Omid is still in Earth orbit. Check the Simple Satellite Tracker for viewing opportunities.

WEEKEND SKY SHOW: Keep an eye on the sunset this weekend. Mercury has emerged from the glare of the sun for its best apparition of the year. Even the birds are watching:

Dennis Put sends the picture from Brielle, The Netherlands. "I used my Canon EOS 350D for a few second exposure at ISO 400."

The view improves on Sunday evening, April 26th, when the crescent Moon joins Mercury for a three-way conjunction with the Pleiades star cluster. Only a real bird brain would miss that. Get the full story and a sky map from Science@NASA.

more images: from Doug Zubenel of Shawnee County, Kansas; from Pete Lawrence of Selsey, West Sussex, UK;

NOT-SO-QUIET SUN: The sun produced an unexpected burst of activity on April 23rd when an enormous prominence rose over the northeastern limb and erupted. SOHO recorded the blast from beginning to end with a series of high-cadence UV snapshots. Click on the image to set the scene in motion:


Click to view a movie

The complex explosion produced not one but two coronal mass ejections (CMEs): movie. An impact from such a double-CME would almost surely spark magnetic storms around the poles of Earth, but it is not heading in our direction. The chance of auroras remains low.


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


Explore the Sunspot Cycle

       
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 25, 2009 there were 1053 potentially hazardous asteroids.
April 2009 Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2009 FU30
Apr. 2
8.8 LD
19
44 m
2004 VC
Apr. 3
51.3 LD
17
785 m
2002 EB3
Apr. 10
41.3 LD
16
1.3 km
2003 SG170
Apr. 19
57.7 LD
18
1.2 km
2009 HF21
Apr. 21
7.4 LD
19
27 m
2009 HJ21
Apr. 23
1.3 LD
18
14 m
2009 FJ30
Apr. 24
9.7 LD
17
130 m
2001 VG5
Apr. 26
58.5 LD
15
2.1 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 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 and Heliospheric Observatory
  Realtime and archival images of the Sun from SOHO.
STEREO
  3D views of the sun from NASA's Solar and Terrestrial Relations Observatory
Daily Sunspot Summaries
  from the NOAA Space Environment Center
Current Solar Images
  from the National Solar Data Analysis Center
Science Central
   
  more links...
   
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