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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: 475.9 km/s
density:
2.4 protons/cm3
explanation | more data
Updated: Today at 2246 UT


X-ray Solar Flares

6-hr max:
C8 1705 UT Jul30
24-hr: X1 0635 UT Jul30
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 30 Jul '05

Sunspot 792 poses a threat for strong solar flares. Credit: SOHO/MDI


Sunspot Number: 69
What is the sunspot number?
Updated: 29 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: 4.6 nT
Bz:
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.


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 30 2204 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 75 % 75 %
CLASS X 20 % 20 %

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 30 2204 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 25 % 40 %
MINOR 15 % 25 %
SEVERE 05 % 15 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 30 % 35 %
MINOR 15 % 30 %
SEVERE 05 % 20 %

What's Up in Space -- 30 Jul 2005
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SOLAR FLARE: A powerful X-class solar flare erupted from sunspot 792 this morning at 0635 UT. SOHO coronagraph images are not yet available, so we don't know if the blast produced a coronal mass ejection (CME). If it did, auroras are possible tonight or tomorrow when the CME reaches Earth. Stay tuned for updates.

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10th PLANET: Astronomers have found a new world bigger than Pluto in the outer reaches of our solar system. Get the full story from Science@NASA.

SUNSPOTS: Sunspot 792, which rounded the sun's eastern limb yesterday, poses a growing threat for Earth-directed explosions--and that's not all. At least one more active region could emerge in the days ahead. Towering magnetic fields jutting over the sun's eastern limb--the same place sunspot 792 came from--signal a new batch of sunspots approaching.


Sunspot 792 erupts on July 29th. Earth is shown for comparison. Image credit: Didier Favre.

more images: from Gary Palmer of Los Angeles, CA; from Jack Newton of British Columbia; from Mila Zinkova of San Francisco, CA; from Jim Tegerdine of Marysville, WA;

ASTEROID FLYBY: On August 8th, asteroid 1992 UY4 will fly past Earth about 15 times farther away than the Moon. Last night in Van Buren, Arkansas, Mike Holloway photographed the space rock streaking among the stars:

"This composite image contains 100x20 second exposures taken over about a 30 minute time frame," says Holloway. The kilometer-wide asteroid was about as bright as a 12th magnitude star.



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 30 Jul 2005 there were 710 known Potentially
Hazardous Asteroids

August 2005 Earth-asteroid encounters
ASTEROID

 DATE (UT)

 MISS DISTANCE

 MAG.
1992 UY4

August 8

16 LD

 12
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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