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

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Science news and information about the Sun-Earth environment.

SPACE WEATHER
Current
Conditions

Solar Wind
speed: 399.4 km/s
density:
3.5 protons/cm3
explanation | more data
Updated: Today at 2245 UT


X-ray Solar Flares

6-hr max:
B2 1940 UT Apr24
24-hr: B8 0405 UT Apr24
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 24 Apr '06

New sunspot 875 poses little threat for strong solar flares. Credit: SOHO/MDI.


Sunspot Number: 24
What is the sunspot number?
Updated: 23 Apr 2006

Far Side of the Sun

This holographic image reveals no large sunspots on the far side of the sun. Image credit: SOHO/MDI

Interplanetary Mag. Field
Btotal: 4.3 nT
Bz:
3.6 nT south
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

A solar wind stream flowing from this large, weakly-organized coronal hole could reach Earth today or tomorrow. 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 Apr 24 2204 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 05 % 10 %
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 Apr 24 2204 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 15 % 15 %
MINOR 05 % 05 %
SEVERE 01 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 15 % 15 %
MINOR 05 % 05 %
SEVERE 01 % 01 %

What's Up in Space -- 24 Apr 2006
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Roses. Candy. Spatulas? Make that the stars: Spaceweather PHONE for Mother's Day.

SOLAR ACTIVITY: A large sunspot, about the size of the planet Neptune, has appeared over the sun's eastern limb. It does not yet pose a threat for strong solar flares, but merits watching: Solar Chat.

COMET NEWS: So many comets, so little time! Astronomers are now monitoring almost 40 fragments of dying comet 73P/Schwassmann Wachmann 3. Of special interest is fragment B, which has just split in two. Using the online Faulkes telescope, Nick James took this picture of the double fragment on April 22nd:

Fragment B is glowing like a 9th magnitude star, making it an easy target for backyard telescopes. Look for it in the constellation Corona Borealis an hour or so after sunset: sky map. The view will only improve in the weeks ahead as 73P approaches Earth for a close encounter in mid-May: full story.

more images: from Ernesto Guido & Giovanni Sostero of Italy; from Anton Spenko of Tunjice, Slovenia; from Eric J. Allen of the Observatoire du Cégep de Trois-Rivières, Quebec;

VENUS & THE MOON: The crescent Moon glided by Venus this morning for a beautiful pre-dawn encounter. "They made a wonderful backdrop for one of the many rock formations at the Colorado National Monument," says photographer Thad V'Soske:

more images: from Michel Hersen of Portland, Oregon; from Gary Palmer of Los Angeles, CA; from Mike O'Leary of El Cajon, CA; from Ron Wayman of Tampa, Florida.



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 24 Apr 2006 there were 778 known Potentially
Hazardous Asteroids

April-May 2006 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
(meters)
2006 GY2

May 16

6.7 LD

13+

~0.8 km
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. 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

Daily images from the sun -- 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.

Lists of Coronal Mass Ejections -- from 1998 to 2001

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1996, 1997, 1998, 1999; 2000; 2001; 2002; 2003; 2004; 2005; Jan-Mar 2006;

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

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

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