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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: 356.4 km/sec
density: 2.9 protons/cm3
explanation | more data
Updated: Today at 2345 UT
X-ray Solar Flares
6-hr max: C4
1830 UT Aug15
24-hr: C4
1830 UT Aug15
explanation | more data
Updated: Today at: 2340 UT
Daily Sun: 15 Aug 10
Sunspot complex 1093-1099 poses a threat for C-class solar flarres. Credit: SDO/HMI
Resolutions: 4096, 1024, 512

more images: from Alan Friedman of Buffalo, NY; from Sascha Somodji of Krefeld, Germany; from Fabio Mariuzza of Biauzzo, Italy; from John Stetson of South Porland, Maine; from John C McConnell of Maghaberry Northern Ireland.
Sunspot number: 31
What is the sunspot number?
Updated 14 Aug 2010

Spotless Days
Current Stretch: 0 days
2010 total: 35 days (15%)
2009 total: 260 days (71%)
Since 2004: 803 days
Typical Solar Min: 486 days
explanation | more info
Updated 14 Aug 2010


The Radio Sun
10.7 cm flux: 85 sfu
explanation | more data
Updated 14 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: 5.6 nT
Bz: 1.7 nT south
explanation | more data
Updated: Today at 2346 UT
Coronal Holes:
A narrow ssolar wind stream flowing from this sinuous coronal hole could reach Earth on August 15th. Credit: SDO/AIA
SPACE WEATHER
NOAA Forecasts
Updated at: 2010 Aug 15 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 15 2201 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
30 %
35 %
MINOR
10 %
10 %
SEVERE
01 %
01 %
What's up in Space
August 15, 2010

AURORA ALERTS: Did you miss the Northern Lights? Next time get a wake-up call from Space Weather PHONE

 

CME ACTIVITY: The sun has produced three bright coronal mass ejections (CMEs) this weekend. None is heading directly for Earth, although the CME of Aug. 14th might deliver a glancing blow to Earth's magnetic field on August 17th. Click here for CME snapshots fro the Solar and Heliospheric Observatory (SOHO).

PERSEID RECAP: According to the International Meteor Shower, the Perseid meteor shower peaked on August 12th around 1800 UT with a maximum of 117 meteors per hour (ZHR). The nearly new Moon provided dark skies for excellent viewing, so the shower was widely observed. Browse the updated gallery for snapshots from around the world.

SUNSPOTS ERUPT IN TANDEM: On August 14th around 1005 UT, magnetic fields connecting sunspot 1093 and 1099 erupted, producing a two-sunspot solar flare (C4-class) and hurling a huge blob of plasma into space. Click on the image to launch a Solar Dynamics Observatory (SDO) movie of the event:


movie formats: 2.4 MB mpeg; 0.9 MB iPhone; 0.7 MB iPad

The explosion lasted for more than two hours, giving many amateur astronomers time to catch the eruption in action. UPDATE: New data from the Solar and Heliospheric Observatory (SOHO) show a coronal mass ejection (CME) emanating from the blast site. The cloud is not heading directly for Earth, but it could deliver a glancing blow to Earth's magnetic field on August 17th. NOAA forecasters estimate a 40% chance of high-latitude geomagnetic activity when it arrives.

more images: from Kristian Molnar of Blahova, Slovakia; from Cai-Uso Wohler of Bispingen, Germany; from Z. Roy and J.Stetson of South Portland, Maine; from Jan Timmermans of Valkenswaard, The Netherlands;

IONOSPHERIC DISTURBANCE: The C4-class solar flare of Aug. 14th bathed Earth's upper atmosphere in X-rays and caused a wave of ionization to sweep over Europe. This improved the propagation of low-frequency radio signals which use the ionosphere as a reflector to skip over the horizon. A SID monitor operated by Jan Karlovsky of Hlohovec, Slovakia, recorded the effect:

"SID" stands for Sudden Ionospheric Disturbance, and a "SID monitor" is a radio receiver that monitors ~20 kHz signals from distant transmitters. "My system easily detected the effects of the solar flare," says Karlovsky. "I monitor two stations: DHO38 in Germany (23.4 kHz) and GQD in Great Britian (22.1 kHz). The German signal was most strongly boosted."

With solar activity on the rise, sudden ionospheric disturbances will become more common. Interested? Stanford University tells you how to build your own SID monitor.


2010 Perseid Photo Gallery
[meteor radar] [Perseid fireball cam]


August 2010 Northern Lights Gallery
[previous Augusts: 2009, 2008, 2007, 2006, 2005, 2004, 2003]

 

 

 

 
       
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 15, 2010 there were 1142 potentially hazardous asteroids.
Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
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 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
1.9 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
2008 KT
Nov 23
5.6 LD
28
10 m
2002 CY46
Sep 2
63.8 LD
16
2.4 km
2010 LY63
Sep 7
56 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
1.9 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
2008 KT
Nov 23
5.6 LD
28
10 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 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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