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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: 439.1 km/sec
density: 3.4 protons/cm3
explanation | more data
Updated: Today at 2345 UT
X-ray Solar Flares
6-hr max: B1
2025 UT Aug02
24-hr: B8
0425 UT Aug02
explanation | more data
Updated: Today at: 2340 UT
Daily Sun: 02 Aug 10
Sunspot 1092 poses a continued threat for C-class solar flares. Credit: SDO/HMI
Resolutions: 4096, 1024, 512
Sunspot number: 13
What is the sunspot number?
Updated 01 Aug 2010

Spotless Days
Current Stretch: 0 days
2010 total: 35 days (16%)
2009 total: 260 days (71%)
Since 2004: 803 days
Typical Solar Min: 486 days
explanation | more info
Updated 01 Aug 2010


The Radio Sun
10.7 cm flux: 80 sfu
explanation | more data
Updated 01 Aug2010

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: 3.4 nT
Bz: 0.4 nT north
explanation | more data
Updated: Today at 2346 UT
Coronal Holes:
There are no large coronal holes on the Earth-facing side of the sun. Credit: SDO/AIA
SPACE WEATHER
NOAA Forecasts
Updated at: 2010 Aug 02 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 Aug 02 2201 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
40 %
MINOR
05 %
20 %
SEVERE
01 %
05 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
25 %
45 %
MINOR
10 %
25 %
SEVERE
01 %
10 %
What's up in Space
August 2, 2010

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

 

NEW MOVIE: Researchers working with data from the Solar Dynamics Observatory have prepared a new movie of yesterday's eruption. Click on the following links to watch the filament lift off the sun in red-hot color: 21 Mb Quicktime, 2 MB iPad, 0.8 MB iPhone.

COMPLEX ERUPTION ON THE SUN: On August 1st around 0855 UT, Earth orbiting satellites detected a C3-class solar flare. The origin of the blast was sunspot 1092. At about the same time, an enormous magnetic filament stretching across the sun's northern hemisphere erupted. NASA's Solar Dynamics Observatory recorded the action:


Click to launch a movie (EUV 304 Å)

The timing of these events suggest they are connected, and a review of SDO movies strengthens that conclusion. Despite the ~400,000 km distance between them, the sunspot and filament seem to erupt together; they are probably connected by long-range magnetic fields. In this movie (171 Å), a shadowy shock wave (a "solar tsunami") can be seen emerging from the flare site and rippling across the northern hemisphere into the filament's eruption zone. That may have helped propel the filament into space.

In short, we have just witnessed a complex global eruption involving almost the entire Earth-facing side of the sun.

A coronal mass ejection (CME) produced by the event is heading directly for Earth: SOHO movie. High-latitude sky watchers should be alert for auroras when it arrives on or about August 3rd.

more images: from Francois Rouviere of Mougins, France; from Rogerio Marcon of Campinas SP Brasil; from Didier Favre of Brétigny-sur-Orge, France; from Cai-Uso Wohler of Bispingen, Germany; from Wouter Verhesen of Sittard, The Netherlands; from Michael Buxton of Ocean Beach, California

SUNSPOT SUNRISE: Sunspot 1092, a key player in yesterday's Earth-directed eruptions, is big enough to see without the aid of a solar telescope. Oleg Toumilovitch "spotted" it on July 31st rising over Blairgowrie, South Africa:


Photo details: Canon EOS-350D, ISO-800, 1/1600s exposure

"During the first few minutes of sunrise only a fraction of the sunlight makes it's way to the observer - mostly from the red part of visible spectrum," notes Toumilovitch. "During this time large sunspots can be seen without a special solar filter." Be careful, though! Even when dimmed by clouds and haze, direct sunlight can hurt your eyes. "If you try to take a picture like this," advises Toumilovitch, "look only at the screen of your digital camera, not the optical viewfinder."

more sunspot shots: from Roman Vanur of Nitra, Slovakia, EU; from Alan Friedman of Buffalo, NY; from Pavol Rapavy of Observatory Rimavska Sobota, Slovakia; from Rogerio Marcon of Campinas SP Brasil; from Michael Boschat of Halifax, Nova Scotia; from THEO BAKALEXIS of Peristeri, Attikh, Greece;


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 August 2, 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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