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Solar wind
speed: 480.0 km/sec
density: 2.1 protons/cm3
explanation | more data
Updated: Today at 2346 UT
X-ray Solar Flares
6-hr max: C1
1953 UT Apr13
24-hr: C1
0334 UT Apr13
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 13 Apr 13
Sunspots AR1718, AR1719, and AR1721 all have 'beta-gamma' magnetic fields that harbor energy for M-class solar flares. Credit: SDO/HMI
Sunspot number: 128
What is the sunspot number?
Updated 13 Apr 2013

Spotless Days
Current Stretch: 0 days
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Since 2004: 821 days
Typical Solar Min: 486 days

Update
13 Apr 2013

The Radio Sun
10.7 cm flux: 138 sfu
explanation | more data
Updated 13 Apr 2013

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 4.7 nT
Bz: 0.1 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 13 Apr 13
There are no large coronal holes on the Earthside of the sun. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2013 Apr 13 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
40 %
40 %
CLASS X
10 %
10 %
Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at: 2013 Apr 13 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
30 %
15 %
MINOR
45 %
05 %
SEVERE
15 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
25 %
20 %
SEVERE
35 %
20 %
 
Saturday, Apr. 13, 2013
What's up in space
 

When is the best time to see auroras? Where is the best place to go? And how do you photograph them? These questions and more are answered in a new book, Northern Lights - a Guide, by Pal Brekke & Fredrik Broms.

 
Northern Lights - a Guide

CME IMPACT: A coronal mass ejection (CME) hit Earth's magnetic field on April 13th around 22:45 UT. The impact was not a strong one, but geomagnetic storms could be in the offing as Earth passes through the CME's wake. Stay tuned for updates! Aurora alerts: text, voice.

This is the CME, leaving the sun at 600 miles per second on April 11th:

The CME was propelled into space by an M6-class eruption in the magnetic canopy of sunspot AR1719. SOHO photographed the expanding cloud using an onboard coronagraph. Speckles near the end of the movie are caused by energetic solar protons hitting the coronagraph's CCD detector.

Note that although the CME appears to hit Mars and Venus, there is no actual physical contact. The cloud is merely passing in front of the two planets. Solar Flare alerts: text, voice.

Realtime Space Weather Photo Gallery


Realtime Comet Photo Gallery


Realtime Aurora Photo Gallery


Realtime Noctilucent Cloud Photo Gallery
[previous years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011]

  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 13, 2013 there were 1395 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2013 GB55
Apr 12
9.8 LD
31 m
2013 GT66
Apr 13
7.1 LD
38 m
2010 GM23
Apr 13
3.9 LD
50 m
2013 GH66
Apr 15
4 LD
10 m
2013 GJ69
Apr 15
7.8 LD
23 m
2013 GH23
Apr 19
5.5 LD
32 m
2005 NZ6
Apr 29
24.9 LD
1.3 km
2001 DQ8
Apr 30
74.3 LD
1.1 km
2004 BV102
May 25
69.9 LD
1.4 km
1998 QE2
May 31
15.2 LD
2.1 km
2000 FM10
Jun 5
50.3 LD
1.3 km
2002 KL3
Jun 6
66.4 LD
1.1 km
1999 WC2
Jun 12
39.2 LD
1.9 km
2006 RO36
Jun 18
70.9 LD
1.2 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
Space Weather Alerts
   
  more links...
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