SPACE WEATHER
Current
Conditions

Solar Wind
speed: 437.1 km/s
density: 1.4 protons/cm³
explanation | more data
Updated: Today at 2257 UT

X-ray Solar Flares
6-hr max: B3 1720 UT May25
24-hr: B7 1140 UT May25
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 25 May '04
Sunspot 618 has developed 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 one sunspot group on the far side of the Sun. Image credit: SOHO/MDI

Sunspot Number: 118
What is the sunspot number?
Updated: 24 May 2004

Interplanetary Mag. Field
B_total: 4.8 nT
B_z: 0.0 nT
explanation | more data
Updated: Today at 2257 UT

Coronal Holes:

The indicated coronal hole is probably too far north to send a solar wind stream toward Earth. Image credit: SOHO Extreme UV 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.

May-July 2004 Earth-asteroid encounters

ASTEROID		MISS DISTANCE	MAG.
2001 US16	May 8	11 LD	15
2004 HC39	May 12	13 LD	17
2004 FJ11	May 24	12 LD	18
1998 SF36	June 26	5 LD	13
1999 MN	July 14	7 LD	16

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 Soft 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