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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: 561.2 km/s
density:
1.8 protons/cm3
explanation | more data
Updated: Today at 2256 UT


X-ray Solar Flares

6-hr max:
C3 1730 UT Jul29
24-hr: C3 1730 UT Jul29
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 29 Jul '05

Newly-emerging sunspot 792 poses a threat for strong solar flares. Credit: SOHO/MDI


Sunspot Number: 29
What is the sunspot number?
Updated: 28 Jul 2005

Far Side of the Sun

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

Interplanetary Mag. Field
Btotal: 3.9 nT
Bz:
2.2 nT south
explanation | more data
Updated: Today at 2256 UT

Coronal Holes:

Earth is inside a solar wind stream flowing from the indicated coronal hole. Image 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 2005 Jul 28 2204 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 70 % 70 %
CLASS X 10 % 10 %

Geomagnetic Storms: Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at 2005 Jul 28 2204 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 35 % 30 %
MINOR 20 % 20 %
SEVERE 05 % 05 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 30 % 30 %
MINOR 25 % 25 %
SEVERE 10 % 10 %

What's Up in Space -- 29 Jul 2005
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METEOR SHOWER: Mark your calendar: The Perseid meteor shower peaks on Friday morning, August 12th, and it should be a good show. [full story]

IT'S HERE: As expected, a big sunspot group emerged over the sun's eastern limb today. It's a very active region, producing frequent solar flares and coronal mass ejections (CMEs). The Solar and Heliospheric Observatory (SOHO) photographed this explosion from the region on July 29th: movie.


A SOHO coronagraph image, July 29, 2005

The CME shown above is not heading toward Earth; we should experience no auroras or radiation storms as a result of the blast. In a few days, however, as the sun's rotation turns the sunspot more and more toward Earth, explosions from its vicinity could affect us. Stay tuned for updates.

more images: from Gary Palmer of Los Angeles, CA; from Didier Favre of Los Angeles, CA; from Steve Rismiller of Milford, Ohio; from Alan Friedman of Buffalo, NY;

SPACE STATION FLYBY: A few hours after the space shuttle Discovery docked with the International Space Station today, the pair flew in front of the sun. Anthony Ayiomamitis of Athens, Greece, photographed the transit:

"The transit lasted 1.1 seconds and was a tremendous sight through my [sun-filtered] AP160 refractor, with exceptional detail and contrast," says Ayiomamitis. "It was a sight to last a lifetime!"



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.

On 29 Jul 2005 there were 703 known Potentially
Hazardous Asteroids

July 2005 Earth-asteroid encounters
ASTEROID

 DATE (UT)

 MISS DISTANCE

 MAG.
2000 AG6

July 22

8.7 LD

 20
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

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.

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; 2004; Jan-Mar., 2005;

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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