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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 473.7 km/sec
density: 1.4 protons/cm3
explanation | more data
Updated: Today at 2345 UT
X-ray Solar Flares
6-hr max: B7
1921 UT Dec30
24-hr: B7
1921 UT Dec30
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 30 Dec 12
None of these sunspots is actively flaring. Credit: SDO/HMI
Sunspot number: 49
What is the sunspot number?
Updated 30 Dec 2012

Spotless Days
Current Stretch: 0 days
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Since 2004: 821 days
Typical Solar Min: 486 days

Update 30 Dec 2012


The Radio Sun
10.7 cm flux: 104 sfu
explanation | more data
Updated 30 Dec 2012

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: 4.1 nT
Bz: -0.0 nT
explanation | more data
Updated: Today at 2346 UT
Coronal Holes: 30 Dec 12
There are no large coronal holes on the Earthside of the sun. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2012 Dec 30 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
10 %
10 %
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: 2012 Dec 30 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
05 %
15 %
MINOR
01 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
10 %
20 %
SEVERE
05 %
20 %
 
Sunday, Dec. 30, 2012
What's up in space
 

Thirty-five new items have just been added to our Meteorite Jewelry collection. Browse the Space Weather Store for something out of this world.

 
Meteorite jewelry

QUIET SUN: With no sunspots actively flaring, the space weather forecast is quiet. NOAA analysts put the odds of a significant eruption today at no more than 10%. Solar flare alerts: text, voice.

WINGED SUNSPOT: The sunspot number briefly jumped yesterday, Dec. 29th, when a winged silhouette flew across the face of the sun. It was the International Space Station (ISS). Earl Foster photographed the transit from Garland, Texas:

Flying faster than 17,000 mph, the ISS took only a fraction of a second to cross the entire solar disk. "I knew precisely when to look thanks to CalSky," says Foster, who used a Solarmax90 solar telescope and a DMK41 digital camera to record the event.

The station's path took it directly in front of an unnumbered active region just north of sunspot AR1638. Solar activity has been low for weeks. So, as expected, no flares occured during the transit. With the sun so quiet, the only breaks in the monotony are provided by spaceships passing by.

Realtime Space Weather Photo Gallery

NACREOUS CLOUDS: Arctic sky watchers should be alert for bright splashes of color this weekend: The nacreous clouds are back. Göran Strand of Östersund, Sweden, photographed this specimen on Dec. 28th:

"The sky was dotted with small but intense nacreous clouds," says Strand. "They lasted for a couple of hours and changed form very often." A close-up photo highlights the vivid colors that are the signature of these clouds.

Atmospheric optics expert Les Cowley comments: "Of all Earth's clouds, nacreous clouds are the most spectacular, and a very rare treat for skywatchers. For up to an hour after sunset or before dawn they glow like eerie electric discharges or gas jets in the darkening sky, their filmy shapes slowly curling and uncurling with intense shifting colors. They are composed of tiny ice crystals more than twice as high as ordinary clouds, 9-16 miles up, in the stratosphere and form at temperatures of minus 85 Celsius and below. The crystals are all of similar size and they diffract the high altitude sunlight to make the colours."

"Search for nacreous clouds at high latitudes (e.g., Scotland, Scandinavia, Iceland, Northern US) in winter and preferably downwind of mountains," Cowley advises. "They like stormy weather that perhaps creates gravity waves to loft the necessary moisture to make them upwards across the tropopause into the stratosphere. Once seen they are never forgotten!"

Realtime Nacreous Cloud Photo Gallery

VAN GOGH CLOUDS: On Christmas morning, Gene Hart of Jonesport, Maine, woke up early to enjoy the sunrise before opening presents. What he saw may have been the best gift of all. "There was a cloud formation showing a remarkable series of wave shapes," says Hart. "They were backlit by the rising sun over Moosabec Reach." He snapped this picture of the harbor using a 14-megapixel digital camera:

"I also took some 28x zoom images of the wave structure," says Hart. The close-ups are a must-see.

These clouds, sometimes called "billow clouds," are produced by the Kelvin-Helmholtz instability when horizontal layers of air brush by one another at different velocities. A better name might be van Gogh clouds: It is widely believed that these waves in the sky inspired the swirls in van Gogh's masterpiece The Starry Night.

Realtime Space Weather Photo Gallery


Realtime Aurora Photo Gallery


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

  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 December 30, 2012 there were 1362 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
1998 WT24
Dec 23
69.2 LD
1.1 km
2012 XM55
Dec 23
3 LD
12 m
2012 YS1
Dec 24
8.1 LD
44 m
2012 XP55
Dec 27
9.2 LD
72 m
1999 HA2
Feb 5
58 LD
1.3 km
3752 Camillo
Feb 12
57.5 LD
3.4 km
1999 YK5
Feb 15
49.1 LD
2.1 km
2012 DA14
Feb 15
0.09 LD
57 m
2009 AV
Feb 25
59.7 LD
1.0 km
2007 EO88
Mar 18
4.4 LD
23 m
1993 UC
Mar 20
49 LD
3.8 km
1997 AP10
Mar 28
45.9 LD
1.8 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
Heliophysics
  the underlying science of space weather
Space Weather Alerts
   
  more links...
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