SPACE WEATHER
Current
Conditions

Solar Wind
speed: 497.0 km/s
density: 2.2 protons/cm³
explanation | more data
Updated: Today at 2236 UT

X-ray Solar Flares
6-hr max: C2 2025 UT Dec22
24-hr: C2 2025 UT Dec22
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 22 Dec '04
Sunspot 713 does not pose a threat for strong solar flares. Credit: Howard Eskildsen of Ocala, Florida

NOTE: The Solar and Heliospheric Observatory (SOHO) has temporarily entered a telemetry keyhole. SOHO sun-pictures that normally appear on SpaceWeather.com won't return until Dec. 26th when SOHO exits the keyhole. Meanwhile, if you're a solar photographer, please send us your pictures. Full-disk images are especially welcomed.

Sunspot Number: 25
What is the sunspot number?
Updated: 21 Dec 2004

Interplanetary Mag. Field
B_total: 5.7 nT
B_z: 2.9 nT north
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

There are no large coronal holes on the sun today. Image credit: NOAA's Solar X-ray Imager

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 are on a collision course with our planet, although astronomers are finding new ones all the time.

Nov.-Dec. 2004 Earth-asteroid encounters

ASTEROID		MISS DISTANCE	MAG.
2004 TP1	Nov. 2	13 LD	15
2004 UE	Nov. 9	10 LD	15
2004 RZ164	Dec. 8	7 LD	12
2004 VW14	Dec. 24	5 LD	13

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.

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. See also Snow Crystals.

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 --a gallery of up-to-date solar pictures from the National Solar Data Analysis Center at the Goddard Space Flight Center. See also the GOES-12 Solar X-ray Imager.

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

SOHO Farside Images of the Sun from SWAN and MDI.

The Latest SOHO Coronagraph Images -- from the Naval Research Lab

The Sun from Earth -- daily images of our star from the Big Bear Solar Observatory

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

Observable Comets -- from the Harvard Minor Planet Center.

What is the Interplanetary Magnetic Field? -- A lucid answer from the University of Michigan. See also the Anatomy of Earth's Magnetosphere.

Real-time Solar Wind Data -- from NASA's ACE spacecraft. How powerful are solar wind gusts? Read this story from Science@NASA.

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

Aurora Forecast --from the University of Alaska's Geophysical Institute

Daily Solar Flare and Sunspot Data -- from the NOAA Space Environment Center.

Lists of Coronal Mass Ejections -- from 1998 to 2001

What is an Iridium flare? See also Photographing Satellites by Brian Webb.

Vandenberg AFB missile launch schedule.

What is an Astronomical Unit, or AU?

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1999; 2000; 2001; 2002; 2003; Jan-Mar., 2004;

Space Audio Streams: (University of Florida) 20 MHz radio emissions from Jupiter: #1, #2, #3, #4; (NASA/Marshall) INSPIRE: #1; (Stan Nelson of Roswell, New Mexico) meteor radar: #1, #2;

Recent International Astronomical Union Circulars

GLOSSARY | SPACE WEATHER TUTORIAL