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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 350.9 km/sec
density: 1.0 protons/cm3
explanation | more data
Updated: Today at 2345 UT
X-ray Solar Flares
6-hr max: B3
1805 UT Sep11
24-hr: B4
0810 UT Sep11
explanation | more data
Updated: Today at: 2340 UT
Daily Sun: 11 Sept 10
Old sunspot 1100 is returning after a two-week transit around the far side of the sun. It will probably be re-numbered "1106" by NOAA later today. Credit: SDO/HMI
Resolutions: 4096, 1024, 512
Sunspot number: 11
What is the sunspot number?
Updated 10 Sep 2010

Spotless Days
Current Stretch: 2 days
2010 total: 41 days (16%)
2009 total: 260 days (71%)
Since 2004: 809 days
Typical Solar Min: 486 days
explanation | more info
Updated 10 Sep 2010


The Radio Sun
10.7 cm flux: 75 sfu
explanation | more data
Updated 10 Sep 2010

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 1
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 2.7 nT
Bz: 0.5 nT north
explanation | more data
Updated: Today at 2346 UT
Coronal Holes: 10 Sept 10
There are no large coronal holes on the Earth-facing side of the sun. Credit: SDO/AIA
SPACE WEATHER
NOAA Forecasts
Updated at: 2010 Sep 11 2201 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
01 %
01 %
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 Sep 11 2201 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
25 %
25 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
30 %
30 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
 
Saturday, Sep. 11, 2010
What's up in space
 

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

 

NEW ERUPTION--UPDATE: During the waning hours of Sept. 10th, a magnetic filament erupted in the sun's northern hemisphere: SDO movie. Newly-arriving data from the Solar and Heliospheric Observatory clearly show a CME emerging from the blast site: SOHO movie. Although the CME is not heading toward Earth, the outskirts of the expanding cloud could hit our planet's magnetic field during the late hours of Sept 12th or Sept. 13th. High-latitude sky watchers should be alert for auroras.

SUNSET SKY SHOW: When the sun goes down tonight, step outside and face west. Venus and the crescent Moon are shining through the twilight in beautiful conjunction, less than 10o apart: sky map.

Tavi Greiner caught the two converging over Shallotte, North Carolina, on Sept 10th:

"The conjunction made me late for dinner," says Greiner. "I was driving to the grocery store when I caught sight of this gorgeous sunset. I turned the car around, dashed home and grabbed my camera. The grocery store will always be there, but scenes like this are few and fleeting." (See a labeled version of Greiner's photo.)

The show will be even better on Sept. 11th. Browse the links for a preview: from Mohammad Mehdi Asgari of Arak, Markazi, Iran; from Stefano De Rosa of Turin, Italy; from Kevin Jung of Grand Rapids, Michigan; from P. Nikolakakos of Sparta Greece; from James Beauchamp of Doha, Qatar; from Mojtaba Taheri of Tehran, Iran

ALIEN BEAUTY: Multiwavelength images of the sun beamed to Earth by NASA's Solar Dynamics Observatory (SDO) have a beauty that can only be described as ... alien. We've never seen the sun quite like this before. Consider the following movie of the Sept. 8th eruption of departing sunspot 1105:

SDO sees the sun through a set of extreme ultraviolet filters that go far beyond the limits of human vision. That's good because extreme UV is where the action is; it's the kind of radiation that solar activity loves to emit. But sometimes it looks a little unfamiliar.

Today's highlighted movie was created by Ralph Seguin of Lockheed-Martin's Solar and Astrophysics Lab. He combined data from three of SDO's extreme UV filters, chosing wavelengths (211 Å, 193 Å, and 171 Å) favored by plasma in the temperature range 1 to 2 million degrees K. Hot stuff! Another movie at 304 Å shows cooler gas, around 80,000 K. By comparing the hot movie vs. the cool movie, researchers hope to learn much about the underlying physics of the eruption.

Look for more alien beauty at NASA's SDO home page.


Sept. 2010 Northern Lights Gallery
[previous Septembers: 2009, 2008, 2007, 2006, 2005, 2004, 2002, 2001, 2000]

  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 11, 2010 there were 1144 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2010 LY63
Sep 7
56 LD
18
1.2 km
2010 RX30
Sep 8
0.6 LD
27
15 m
2010 RF12
Sep 8
0.2 LD
28
9 m
2010 RJ53
Sep 9
8.1 LD
24
80 m
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 EZ16
Nov 30
73.9 LD
18
1.0 km
2000 JH5
Dec 7
47 LD
17
1.5 km
2010 JL33
Dec 9
16.6 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 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
Current Solar Images
  from the National Solar Data Analysis Center
Science Central
   
  more links...
 
 
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