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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 456.6 km/sec
density: 2.3 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B9
1757 UT Sep04
24-hr: C2
0507 UT Sep04
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 04 Sep 12
Sunspot 1564 is suddenly growing. It has a 'beta-gamma' magnetic field that harbors energy for M-class solar flares. Credit: SDO/HMI
Sunspot number: 156
What is the sunspot number?
Updated 04 Sep 2012

Spotless Days
Current Stretch: 0 days
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 04 Sep 2012


The Radio Sun
10.7 cm flux: 142 sfu
explanation | more data
Updated 04 Sep 2012

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 4
unsettled
explanation | more data
Interplanetary Mag. Field
Btotal: 13.2 nT
Bz: 1.5 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 04 Sep 12
There are no large coronal holes on the Earthside of the sun. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2012 Sep 04 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
25 %
25 %
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: 2012 Sep 04 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
15 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
30 %
20 %
SEVERE
30 %
25 %
 
Tuesday, Sep. 4, 2012
What's up in space
 

Hang the Transit of Venus on your wall! Hubble-quality images from NASA's Solar Dynamics Observatory are now available as metallic posters in the Space Weather Store.

 
Venus Transit metal posters

NEAR-EARTH ASTEROID: A relatively large asteroid, just discovered on August 28th, will fly past the Earth-Moon system on Sept 14th only 2.8 million km (7.4 lunar distances) away. 2012 QG42 is about as wide as three football fields and comes to us from just beyond the orbit of Mars. Astronomers who are now monitoring the space rock say it shines about as brightly as a 15th magnitude star. [3D orbit] [ephemeris]

SUBSIDING STORM: A geomagnetic storm that began on Sept. 3rd when a coronal mass ejection (CME) hit Earth's magnetic field is subsiding. The impact at 1200 UT (5 am PDT) induced significant ground currents in the soil of northern Scandinavia and sparked bright auroras around the Arctic Circle. Ole C. Salomonsen photographed the display over Naimakka, Finland, on Sept. 4th:

"There I was standing all alone deep in the Finish forest, just in awe of this display of light above my head," says Salomonsen. "This is just one of many images of spectacular auroras I shot on this wonderful night."

Stay tuned to the aurora gallery for new photos of the storm. Aurora alerts: text, phone.

Realtime Aurora Photo Gallery

SUNSPOT AR1564: The next strong flare could be just around the corner. Sunspot AR1564 is growing rapidly and has developed a 'beta-gamma' magnetic field that harbors energy for M-class flares. NASA's Solar Dynamics Observatory took this picture of the active region during the early hours of Sept. 4th:

NOAA forecasters estimate a 40% chance of M-flares during the next 24 hours. Any eruptions will likely be Earth-directed as the active region is turning toward our planet. Solar Flare alerts: text, phone.

Realtime Space Weather 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 September 4, 2012 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2009 AV
Aug 26
62.8 LD
--
1.0 km
2012 QZ16
Aug 30
7 LD
--
33 m
2012 QG42
Sep 14
7.4 LD
--
355 m
2012 QC8
Sep 14
22.7 LD
--
1.1 km
1998 UO1
Oct 4
60.1 LD
--
2.1 km
2005 GQ21
Oct 12
77 LD
--
1.0 km
1998 ST49
Oct 18
28.7 LD
--
1.3 km
1991 VE
Oct 26
34 LD
--
1.1 km
2012 QF49
Oct 29
77.7 LD
--
1.6 km
2001 CV26
Oct 30
68 LD
--
2.4 km
2007 PA8
Nov 5
16.8 LD
--
2.4 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
Trade Show Displays
   
  more links...
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