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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: 533.9 km/sec
density: 0.6 protons/cm3
explanation | more data
Updated: Today at 2346 UT
X-ray Solar Flares
6-hr max: B6
1910 UT Jul31
24-hr: B6
1910 UT Jul31
explanation | more data
Updated: Today at: 2340 UT
Daily Sun: 31 Jul 10
Sunspot 1089 is decaying and poses a declining threat for C-class solar flares. Credit: SDO/HMI
Resolutions: 4096, 1024, 512
Sunspot number: 29
What is the sunspot number?
Updated 30 July 2010

Spotless Days
Current Stretch: 0 days
2010 total: 35 days (17%)
2009 total: 260 days (71%)
Since 2004: 803 days
Typical Solar Min: 486 days
explanation | more info
Updated 30 July 2010


The Radio Sun
10.7 cm flux: 83 sfu
explanation | more data
Updated 30 July 2010

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 3.2 nT
Bz: 1.4 nT north
explanation | more data
Updated: Today at 2346 UT
Coronal Holes:
Earth is inside a solar wind stream flowing from the indicated coronal hole. Credit: SDO/AIA
SPACE WEATHER
NOAA Forecasts
Updated at: 2010 Jul 31 2201 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: 2010 Jul 31 2201 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
35 %
35 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
30 %
30 %
MINOR
10 %
10 %
SEVERE
01 %
01 %
What's up in Space
July 31, 2010

ANDROID FLYBYS: Our field-tested satellite tracker is now available for Android phones. Features: Global predictions and flyby alarms! Learn more.

 

SPECTACULAR SUNSPOT: Today, big sunspot 1092 and its surroundings are putting on a spectacular show for anyone with a solar telescope. Click on the links for snapshots from around the world: #1, #2, #3, #4, #5, #6, #7, #8, #9

CELESTIAL TRIANGLE: When the sun goes down tonight, step outside and look west. Venus, Saturn, and Mars have converged to form a skinny triangle in the sunset sky. Stefano De Rosa sends this picture from the shores of Viverone lake in Turin, Italy:

"Superbright Venus popped out of the twilight first, followed minutes later by Mars and Saturn," says De Rosa. "The sight of the lovely celestial triangle over the calm water of the lake was really great!"

The three planets will remain in triangular formation for many nights to come, only the angles will change. Keep an eye on the sunset! Sky maps: July 31, August 1, 2, 3, 4, 5, 6, 7, 8

more triangle images: from Amirreza Kamkar of Qayen, Khorasan, Iran; from Gary A. Becker of Coopersburg, PA; from Stefano De Rosa of Viverone lake, Turin, Italy; from Richard Glenn of Gold Beach, Oregon; from Adrian New of San Antonio, Texas

CORONAL MASS EJECTION: During the late hours of July 30th, a magnificent coronal mass ejection (CME) billowed away from the eastern limb of the sun. Click on the image to set the cloud in motion:

If a CME like this hit Earth, polar sky watchers would likely see bright auroras. In this case, however, the cloud is not aimed in our direction. At most, it would deliver a glancing blow to Earth's magnetic field around August 2nd, producing only minor geomagnetic activity.

The source of the blast was apparently sunspot 1092. Future CMEs could be more geoeffective as the sunspot turns to face Earth in the days ahead. Stay tuned!


Solar Eclipse Photo Gallery
[NASA: South Pacific Eclipse] [animated map]

 
       
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 31, 2010 there were 1140 potentially hazardous asteroids.
Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2010 KZ117
Aug 4
72.6 LD
18
1.0 km
6239 Minos
Aug 10
38.3 LD
18
1.1 km
2005 NZ6
Aug 14
60.5 LD
18
1.3 km
2002 CY46
Sep 2
63.8 LD
16
2.4 km
2010 LY63
Sep 7
56.1 LD
18
1.2 km
2009 SH2
Sep 30
7.1 LD
25
45 m
1998 UO1
Oct 1
32.1 LD
17
2.1 km
2005 GE59
Oct 1
77 LD
18
1.1 km
2001 WN5
Oct 10
41.8 LD
18
1.0 km
1999 VO6
Oct 14
34.3 LD
17
1.8 km
1998 TU3
Oct 17
69.1 LD
15
5.3 km
1998 MQ
Oct 23
77.7 LD
17
2.0 km
2007 RU17
Oct 29
40.6 LD
18
1.0 km
2003 UV11
Oct 30
5 LD
19
595 m
3838 Epona
Nov 7
76.8 LD
16
3.4 km
2005 QY151
Nov 16
77.7 LD
18
1.3 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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