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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: 361.6 km/sec
density: 8.3 protons/cm3
explanation | more data
Updated: Today at 2246 UT
X-ray Solar Flares
6-hr max: B1
2030 UT Dec16
24-hr: C1
0355 UT Dec16
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 16 Dec 07
Giant sunspot 978 is breaking up. This is a good opportunity for amateur astronomers with backyard solar telescopes to watch a planet-sized object dissolve. Credit: SOHO/MDI
Sunspot number: 39
What is the sunspot number?
Updated 15 Dec 2007
Far side of the Sun:
This holographic image reveals one small sunspot on the farside of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 1
quiet
explanation | more data
Current Auroral Oval:

Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Updated: 2007 Dec 16 2130 UT
What is the auroral oval?
Interplanetary Mag. Field
Btotal: 3.0 nT
Bz: 0.7 nT north
explanation | more data
Updated: Today at 2247 UT
Coronal Holes:
A solar wind stream flowing from the indicated coronal hole should reach Earth on Dec. 17th or 18th. Credit: Hinode X-ray Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Dec 16 2203 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
05 %
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: 2007 Dec 16 2203 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
35 %
20 %
MINOR
20 %
15 %
SEVERE
10 %
05 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
35 %
30 %
MINOR
25 %
25 %
SEVERE
10 %
10 %

What's up in Space
December 16, 2007
Where's Saturn? Is that a UFO--or the ISS? What's the name of that star? Get the answers from mySKY--a fun new astronomy helper from Meade.

SUN BUZZ: The solar physics community is abuzz this week. No, there haven't been any great eruptions or solar storms. The source of the excitement is a modest knot of magnetism that popped up on the sun, possibly heralding the start of a new solar cycle: full story.

SUNSPOT FAREWELL: Giant sunspot 978 is approaching the sun's western limb where it will soon disappear. Rogerio Marcon of Sao Paulo, Brazil, took this last minute shot using a Coronado SolarMax40:

Sunspot 978 is decaying as it goes. Magnetic instabilities accociated with this process could hurl filaments and clouds of gas over the limb, making the days around its disappearance most entertaining. Stay tuned.

more images: from the Langkawi National Observatory, Langkawi Island, Malaysia; from Howard Eskildsen of Ocala, Florida; from Franck Charlier of Marines, Val d'Oise - France; from S. Johansen, J. Fairfull and John Stetson of South Portland, Maine;

SUBSIDING GEMINIDS: After two nights in a row of impressive flurries and fireballs, the Geminid meteor shower has finally subsided. Rates are now less than 10% of the 100+ per hour peak on Dec. 14th and 15th.

In Guffey, Colorado, an all-sky camera operated by Chris Peterson captured 111 of the brightest meteors on Dec. 12th - 15th:

"At least 65 are confirmed Geminids," says Peterson. "Several very bright fireballs are apparent, as well as the curved trails of Mars and Sirius."

The Geminids of 2007 began on Dec. 13th less flamboyantly than expected, but the shower quickly developed into one of the best Geminid displays in years. According to the International Meteor Organization, counts under ideal dark-sky conditions reached 140 meteors per hour. Dec. 15th produced an extra helping of fireballs making the night after the predicted Dec. 14th peak visually best of all.

2007 Geminid Meteor Gallery
[World Map of Geminid Sightings]
[Geminid recap] [meteor alerts] [Night Sky Cameras]

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 16, 2007 there were 911 potentially hazardous asteroids.
Dec-Jan Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2007 XZ9
Dec. 1
8.1 LD
18
45 m
2007 VD184
Dec. 9
7.8 LD
18
95 m
3200 Phaethon
Dec. 10
47 LD
14
5 km
2007 TU24
Jan. 29
1.4 LD
19
405 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 bureau for real-time monitoring of solar and geophysical events, research in solar-terrestrial physics, and forecasting solar and geophysical disturbances.
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.
Daily Sunspot Summaries
  From the NOAA Space Environment Center
Current Solar Images
  from the National Solar Data Analysis Center
  more links...
©2007, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.
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