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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: 389.6 km/sec
density: 3.1 protons/cm3
explanation | more data
Updated: Today at 2246 UT
X-ray Solar Flares
6-hr max: B2
1730 UT Dec15
24-hr: B3
0920 UT Dec15
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 15 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: 35
What is the sunspot number?
Updated 14 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= 0
quiet
explanation | more data
Current Auroral Oval:

Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Updated: 2007 Dec 15 2154 UT
What is the auroral oval?
Interplanetary Mag. Field
Btotal: 2.2 nT
Bz: 1.1 nT south
explanation | more data
Updated: Today at 2247 UT
Coronal Holes:
A solar wind stream flowing from the indicated coronal hole should reach Earth on or about Dec. 17th. Credit: Hinode X-ray Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Dec 15 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 15 2203 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
30 %
MINOR
10 %
20 %
SEVERE
01 %
05 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
35 %
MINOR
15 %
25 %
SEVERE
05 %
10 %

What's up in Space
December 15, 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 BREAKUP: Giant sunspot 978 is dispersing. The Solar and Heliospheric Observatory (SOHO) has been monitoring the spot and recorded this 9-day movie chronicling its evolution from birth to present:

This is a good opportunity for amateur astronomers with backyard solar telescopes to watch a Jupiter-sized object break apart.

more images: from Rogerio Marcon of Sao Paulo, Brazil; from the Hinode spacecraft in Earth orbit; from S. Johansen, J. Fairfull and John Stetson of South Portland, Maine; from Franck Charlier of Marines, Val d'Oise - France; from Alcaria Rego of Almada - Portugal; from Eric Soucy of Ohain, Brabant wallon, Belgium; from James Kevin Ty of Manila, the Philippines;

GEMINIDS CONTINUED: If it's dark where you live, be alert for Geminids; although the the shower is subsiding, it is still producing some impressive meteors.

"The Geminids were terriffic tonight (Dec. 15th)," reports airline pilot Dan Wood. "I just finished a trip from New Orleans and we got to watch the show through the airplane's windows. At times there were three or more Geminids per minute with seven or eight really bright green ones. I even saw a few while on the ground in Las Vegas--not the darkest place on the planet!"

Half a world away, a similar flurry appeared over China:

"More than one hundred people at the Beijing Planetarium enjoyed the glittering meteors," says photographer Xin Li. He combined ten photos taken with his Canon EOS 30D to produce a composite "meteor splash." Tracing the meteors backwards in time shows that they all come from a common radiant in the constellation Gemini.

In Reno, Nevada, James Mangum "sprawled out in the snow and counted more than 80 meteors in an hour. One rust-colored fireball lasted nearly 4 seconds as it crossed the sky, leaving bits and pieces in its path. Others were quite bright and blue in color. Great shower!"

2007 Geminid Meteor Gallery
[World Map of Geminid Sightings]
[sky map] [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 15, 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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