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Solar wind
speed: 342.6 km/sec
density: 1.3 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B7
2208 UT Apr02
24-hr: B9
1515 UT Apr02
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 02 Apr 13
Sunspot AR1711 is large but quiet. The chance of flares today is low. Credit: SDO/HMI
Sunspot number: 84
What is the sunspot number?
Updated 02 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
02 Apr 2013

The Radio Sun
10.7 cm flux: 119 sfu
explanation | more data
Updated 02 Apr 2013

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 3.1 nT
Bz: 0.6 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 02 Apr 13
Solar wind flowing from this coronal hole should reach Earth on April 6-7. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2013 Apr 02 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
05 %
05 %
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: 2013 Apr 02 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
20 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
30 %
30 %
SEVERE
25 %
25 %
 
Tuesday, Apr. 2, 2013
What's up in space
 

Listen to radar echoes from satellites and meteors, live on listener-supported Space Weather Radio.

 
Spaceweather Radio is on the air

SLIM CHANCE OF FLARES: NOAA forecasters estimate a slim 10% chance of M-class solar flares today. None of the sunspots on the Earthside of the sun has the kind of complex magnetic field that harbors energy for strong eruptions. Solar flare alerts: text, voice.

POLAR FILAMENT ERUPTION: Not every eruption requires a sunspot. On April 1st, a magnetic filament snaking some 800,000 km around the sun's north pole rose up and erupted, hurling part of itself into space. NASA's Solar Dynamics Observatory (SDO) recorded the event:

Watch the movie again and pay attention to the southern hemisphere. Another filament erupted there in apparent sympathy with events in the north. Coincidence? Probably not. Invisible threads of magnetism connect widely separated parts of the sun, so an explosion in one place can trigger another explosion very far away. SDO has observed many such chain reactions--the iconic example being the global eruption of August 2010.

Much of the northern filament remains intact, which means more eruptions are possible in the days ahead. Stay tuned.

Realtime Space Weather Photo Gallery

COMET-GALAXY ENCOUNTER: Comet Pan-STARRS is heading for the Andromeda Galaxy (aka M31). On the nights of April 2nd through 5th, the bright comet will pass so close to the pinwheel star system that they will be visible as a tight pair in the fields of view of wide-field telescopes and digital cameras. Asko Aikkila of Kuusamo, Finland, photographed the convergence on April 1st:

"It was a beautiful sight in very clear skies," says Aikkila.

At closest approach on April 3-4, the comet will be just a few degrees from the galaxy. Deep exposures might even show the comet's tail touching Andromeda's outermost spiral arms. In fact, no physical contact will occur; the comet is still in the solar system while Andromeda is 2.5 million light years away.

Both the comet and the galaxy are barely visible to the unaided eye as faint fuzzy patches in the western sky after sunset. To find them, scan the sky with binoculars or set your GOTO telescope to "Andromeda."

More about Pan-STARRS: NASA video, 3D orbit, ephemeris, light curves.

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 2, 2013 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2013 EL89
Mar 29
4.6 LD
29 m
2013 FB8
Mar 30
4.2 LD
44 m
2010 GM23
Apr 13
3.9 LD
50 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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