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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: 379.5 km/sec
density: 1.9 protons/cm3
explanation | more data
Updated: Today at 2244 UT
X-ray Solar Flares
6-hr max: B5
1650 UT Dec09
24-hr: B8
1605 UT Dec09
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 09 Dec 07
Sunspot 978 continues to grow but it does not yet pose a threat for strong solar flares. Credit: SOHO/MDI
Sunspot number: 36
What is the sunspot number?
Updated 03 Dec 2007
Far side of the Sun:
This holographic image shows sunspot 978 rotating from the farside to the near side of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 1 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 09 2125 UT
What is the auroral oval?
Interplanetary Mag. Field
Btotal: 4.3 nT
Bz: 1 nT south
explanation | more data
Updated: Today at 2246 UT
Coronal Holes:
A solar wind stream flowing from the indicated coronal hole could hit Earth on Dec. 11th or 12th. Credit: Hinode X-ray Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Dec 09 2204 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
15 %
15 %
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 09 2204 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
20 %
MINOR
05 %
15 %
SEVERE
01 %
05 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
25 %
MINOR
15 %
15 %
SEVERE
05 %
05 %

What's up in Space
December 9, 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.

LAUNCH POSTPONED: Continued problems with fuel sensors have prompted mission controllers to postpone today's planned launch of space shuttle Atlantis on an 11-day construction mission to the International Space Station. The next launch window: January 2008. NASA says January 2nd is the earliest Atlantis will leave the launch pad (photo credit: Mike Theiss).

SUNSPOT SUNSET: Sunspot group 978 continues to grow (movie) and it now occupies an expanse of sun more than 6 times wider than Earth. "Sunspot 978 is quite big and interesting," says Peter Heinzen of Raron, Switzerland. "I photographed the spot last night just as the sun was setting behind some fir trees here in the Swiss Alps."

 

He used a Canon EOS 40D and a sun-filtered Takahashi FS-78 refractor to capture this rare "sunspot sunset." Although sunspot 978 is large and growing, the sunspot's magnetic field remains uncomplicated and stable; no big solar flares are in the offing. Stay tuned for updates.

more images: from Franck Charlier of Marines, Val d'oise - France; from Javier Temprano of Santander, Spain; from Rogerio Marcon of Campinas - Sao Paulo, Brazil; from Oldfield of Hong Kong; from the Hinode spacecraft in Earth orbit; from J. Fairfull and J. Stetson of South Portland, Maine; from John Nassr of Baguio, Philippines; from Pete Lawrence of Selsey, UK; from Cai-Uso Wohler of Bispingen, Germany;

SUNSET MIRAGE: "Every day recently I've been taking my camera to work where I have a nice view over Santa Monica Bay," reports photographer Jeff Hapeman of Santa Monica, California. "On December 4th I caught this amazing sunset mirage."


Photo details: Canon G9, ISO 80, 1/640s, f/4.8.

A temperature inversion layer split the setting sun into 3 ... 4 ... 5 pieces! Atmospheric optics expert Les Cowley says the California Coast is a good place to see such things. "The combination of cold offshore ocean current and warm winds from the land give temperature inversions, layers of abnormally hot and cold air that bend the sun’s rays to form sunset mirages and green flashes."

In this particular case, "just one inversion has given us three squashed suns, one setting above the layer, one rising from the sea and another sinking towards it. Microstructure or multiple stacked inversions have split the topmost sun into three more little pieces."

The topmost sun often disappears with a final green flash. Says Hapeman, "I'm hoping to catch that next!"


Comet 17P/Holmes Photo Gallery
[Interactive World Map of Comet Photos]
[sky map] [ephemeris] [3D orbit] [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 9, 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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