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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 562.0 km/sec
density: 5.2 protons/cm3
explanation | more data
Updated: Today at 2341 UT
X-ray Solar Flares
6-hr max: B6
2252 UT Jul30
24-hr: M9
0209 UT Jul30
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 30 Jul 11
Sunspots 1260 an 1261 pose a threat for strong M-class solar flares. Credit: SDO/HMI
Sunspot number: 88
What is the sunspot number?
Updated 29 Jul 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 29 Jul 2011


The Radio Sun
10.7 cm flux: 112 sfu
explanation | more data
Updated 29 Jul 2011

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 5 storm
24-hr max: Kp= 5
storm
explanation | more data
Interplanetary Mag. Field
Btotal: 4.7 nT
Bz: 0.4 nT south
explanation | more data
Updated: Today at 2344 UT
Coronal Holes: 30 Jul 11
A solar wind stream flowing from this coronal hole should reach Earth on July 31st or Aug. 1st. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2011 Jul 30 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
45 %
45 %
CLASS X
05 %
05 %
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 Jul 30 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
35 %
35 %
MINOR
15 %
15 %
SEVERE
05 %
05 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
40 %
40 %
MINOR
20 %
20 %
SEVERE
10 %
10 %
 
Saturday, Jul. 30, 2011
What's up in space
 

Turn your cell phone into a field-tested satellite tracker. Works for Android and iPhone.

 
Satellite flybys

GEOMAGNETIC STORM: High-latitude sky watchers should be alert for auroras. A polar geomagnetic storm (magnitude Kp=5) is underway in response to solar wind buffeting Earth's magnetic field.

WHAT LIES INSIDE JUPITER?The clouds of Jupiter hide many mysteries--from the roots of monster storms to possible stores of exotic matter. NASA's Juno spacecraft, scheduled to launch on August 5th, is going to find out what lies inside the giant planet. [full story] [video]

STRONG FLARE: Sunspot AR1261 unleashed a brief but strong M9-class solar flare on July 30th at 0209 UT. NASA's Solar Dynamics Observatory recorded the flare's extreme ultraviolet flash:

Because of its brevity, the eruption did not hurl a substantial cloud of material toward Earth. No CME is visible in SOHO coronagraphs. The eruption was not geoeffective, although future eruptions could be as the active region continues to turn toward Earth. Solar flare alerts: text, voice.

SHAPE-SHIFTING SUNSPOT: Three big sunspot groups are rotating across the Earth-facing side of the sun. One of them, AR1261, is morphing into a circular ring. Click on the image to view a 24-hour movie:

The magnetic field of this shape-shifting sunspot is crackling with C- and M-class solar flares, including a powerful M9-blast to begin the day on July 30th. NOAA forecasters estimate a 40% chance of more such flares during the next 24 hours. Readers with solar telescopes are encouraged to monitor developments.

more images: from Efrain Morales Rivera of Aguadilla, Puerto Rico; from Rogerio Marcon of Campinas SP Brasil; from John Stetson of Falmouth, Maine; from John Minnerath of Crowheart, Wyoming; from Pepe Manteca of Begues, Barcelona, Spain; from Michael Boschat of Halifax, Nova Scotia, Canada; from Monty Leventhal OAM of Sydney. Australia


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


June 2011 Aurora Gallery
[Aurora alerts: text, voice] [previous Junes: 2010, 2008, 2001]

  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 July 30, 2011 there were 1237 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2007 DD
Jul 23
9.3 LD
--
31 m
2003 BK47
Jul 26
77.6 LD
--
1.1 km
2009 AV
Aug 22
49.7 LD
--
1.1 km
2003 QC10
Sep 18
50 LD
--
1.2 km
2004 SV55
Sep 19
67.5 LD
--
1.2 km
2007 TD
Sep 23
3.8 LD
--
58 m
2002 AG29
Oct 9
77.1 LD
--
1.0 km
2000 OJ8
Oct 13
49.8 LD
--
2.5 km
2009 TM8
Oct 17
1.1 LD
--
8 m
2011 FZ2
Nov 7
75.9 LD
--
1.6 km
2005 YU55
Nov 8
0.8 LD
--
175 m
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
Science Central
 
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