SPACE WEATHER
Current
Conditions

Solar Wind
speed: 519.8 km/s
density: 2.1 protons/cm³
explanation | more data
Updated: Today at 2245 UT

X-ray Solar Flares
6-hr max: C3 2235 UT Aug11
24-hr: C6 1140 UT Aug11
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 11 Aug '04
Sunspot 649 has a "beta-gamma-delta" magnetic field that harbors energy for X-class solar flares. Image credit: SOHO/MDI

The Far Side of the Sun

This holographic image reveals a mid-sized sunspot on the far side of the sun. Image credit: SOHO/MDI

Sunspot Number: 93
What is the sunspot number?
Updated: 10 Aug 2004

Interplanetary Mag. Field
B_total: 3.6 nT
B_z: 0.1 nT south
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

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

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.

July-Sept. 2004 Earth-asteroid encounters

ASTEROID		MISS DISTANCE	MAG.
1999 MN	July 11	8 LD	16
2001 OY13	July 14	25 LD	16
2000 PH5	July 25	5 LD	17
2003 UX34	Sept. 9	22 LD	18
2004 JA27	Sept. 10	23 LD	19
1998 OX4	Sept. 14	25 LD	18
Toutatis	Sept. 29	4 LD	9

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