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


X-ray Solar Flares

6-hr max:
C2 2200 UT Aug26
24-hr: C2 2200 UT Aug26
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 26 Aug '05

None of these sunspots pose a threat for strong solar flares. Credit: SOHO/MDI


Sunspot Number: 76
What is the sunspot number?
Updated: 25 Aug 2005

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: 3.5 nT
Bz:
0.6 nT north
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

There are no large coronal holes on the Earth-facing side of the sun today. 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 Aug 26 2203 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 15 % 15 %
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 2005 Aug 26 2203 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 20 % 20 %
MINOR 15 % 15 %
SEVERE 05 % 05 %

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

What's Up in Space -- 26 Aug 2005
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You slept through the aurora storm? Next time get a wake-up call. Sign up for SpaceWeather PHONE.

SUNSET PLANETS: Lately, have you noticed a pair of bright lights shining through the rosy glow of sunset? That would be Venus and Jupiter: the two brightest planets are converging in the evening sky. Look for them tonight: sky map.

BEWARE THE MARS HOAX: Just when you thought it was safe to read your email.... There's a rumour going around the internet: On August 27th, Mars will come so close to Earth, it'll look as large as the full Moon. Not! Science@NASA exposes the hoax.

Above: Mars and the Moon, photographed side by side in July 2003 when Mars was even closer to Earth than it is now. "Do you think the Red Planet could really grow to be larger in the sky that a full Moon?" asks photographer Rick Stankiewicz of Ontario, Canada.

Although Mars won't look as big as the Moon this weekend, it is approaching Earth, and it is a pretty sight. Look for Mars, bright and red, almost directly overhead before sunrise: sky map.

AURORA STORM: It's over. A geomagnetic storm that began on August 24th when a coronal mass ejection hit Earth has subsided. During the storm, sky watchers saw bright auroras in Colorado, Utah, Wisconsin, New York and other US states.

Anthony Arrigo of Park City, Utah, reports: "I got a call from SpaceWeather Phone at 3:30 am." He walked out on his back deck and saw this:

"Even the really bright moon was no match for the auroras--for a little while," Arrigo adds.

August 2005 Aurora Gallery



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 26 Aug 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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