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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids

SpaceWeather.com
Science news and information about the Sun-Earth environment.

SPACE WEATHER
Current
Conditions

Solar Wind
speed: 652.3 km/s
density:
0.6 protons/cm3
explanation | more data
Updated: Today at 2246 UT

X-ray Solar Flares
6-hr max:
A0 2020 UT Dec22
24-hr: A5 0455 UT Dec22
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 22 Dec '06

The sun is blank and solar activity is low. Credit:
SOHO/MDI

Sunspot Number: 0
What is the sunspot number?
Updated: 21 Dec 2006

Far Side of the Sun

This holographic image reveals, apparently, a new and large sunspot on the far side of the sun. Image credit: SOHO/MDI

Interplanetary Mag. Field
Btotal: 4.3 nT
Bz:
0.6 nT north
explanation | more data
Updated: Today at 2247 UT

Coronal Holes:

Earth is inside a solar wind stream flowing from the indicated coronal hole. Credit: SOHO Extreme UV Telescope


SPACE WEATHER
NOAA
Forecasts

Solar Flares: Probabilities for a medium-sized (M-class) or a major (X-class) solar flare during the next 24/48 hours are tabulated below.
Updated at 2006 Dec 22 2203 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 2006 Dec 22 2203 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 30 % 20 %
MINOR 10 % 05 %
SEVERE 01 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 40 % 30 %
MINOR 20 % 10 %
SEVERE 05 % 01 %

What's Up in Space -- 22 Dec 2006
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Auroras for Christmas? It could happen... Sign up for Spaceweather PHONE.

THE NEXT SOLAR CYCLE: Evidence is mounting that the next solar cycle, due to peak in 2010 or 2011, is going to be a big one. Get the full story from Science@NASA.

HAPPY CHELLEH NIGHT: This morning at 22 minutes past midnight Universal Time, the sun reached its lowest declination of the year: minus 23.5 degrees. Astronomers call this the "winter solstice"--the first day of northern winter and the longest night of the year.

In Iran, "we celebrate the long night (CHELLEH night or YALDA night) by staying up late with family members," says Poyan Shahidi, an Iranian in Toronto, Canada. "We read Hafez poems, listen to Iranian music, eat nuts and fruits, especially pomegranate and watermelon." (continued below)

"In the picture, you can see the table I have set for this special night. I arranged the candles as the winter constellation Orion."

"Happy Chelleh night!"

ROUND AND ROUND "...and round she goes, but where to land? Only NASA knows." Actually, NASA doesn't know where Discovery will land today. It all depends on the weather.

Sitting at his computer this morning, wondering which of three landing sites Discovery will choose, Gary Palmer of Los Angeles created this artistic interpretation of the sizzling re-entry:


The background image was taken by G. Palmer using a Coronado SolarMax90.

Trivia: The surface temperature of the sun is 9000 F. The shuttle's heat of re-entry is "only" 3000 F. So it's not truly as as hot as a G-type star--but still plenty hot.

Check NASA.gov for updates about Discovery's scheduled touchdown this afternoon. To the crew: Safe landing!

Shuttle Galleries: Night Launch and Undocking



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 22 Dec 2006 there were 831 known Potentially
Hazardous Asteroids

Dec 2006 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
2006 WQ127

Dec. 2

7.9 LD

19

~94 m
2006 WB

Dec. 5

7.0 LD

17

~130 m
2004 XL14

Dec. 20

10.1 LD

15

~225 m
2006 XD2

Dec. 24

10.7 LD

16

~260 m
Notes: LD is a "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 Environment 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. (European Mirror Site)

Daily Sunspot Summaries -- from the NOAA Space Environment Center.

Current Solar Images -- from the National Solar Data Analysis Center

X-ray images of the Sun: GOES-12 and GOES-13

Recent Solar Events -- a summary of current solar conditions from lmsal.com.

What is the Magnetosphere?

The Lion Roars -- visit this site to find out what the magnetosphere sounds like.

List of Potentially Hazardous Asteroids -- from the Harvard Minor Planet Center.

Observable Comets -- from the Harvard Minor Planet Center.

Real-time Solar Wind Data -- from NASA's ACE spacecraft.

How powerful are solar wind gusts? Not very! Read this story from Science@NASA.

More Real-time Solar Wind Data -- from the Solar and Heliospheric Observatory Proton Monitor.

Lists of Coronal Mass Ejections -- from 1996 to 2006

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1994, 1995, 1996, 1997, 1998, 1999; 2000; 2001; 2002; 2003; 2004; 2005; Jan-Mar 2006; Apr-Jun 2006; Jul-Sep 2006; Oct-Dec 2006.

This site is penned daily by Dr. Tony Phillips: email


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