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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: 651.8 km/s
density:
1.0 protons/cm3
explanation | more data
Updated: Today at 2245 UT

X-ray Solar Flares

6-hr max:
B3 1650 UT Sep10
24-hr: B4 1550 UT Sep10
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 10 Sep '03
Sunspot 456 is growing but it doesn't yet pose a threat for strong solar flares. Image credit: SOHO MDI

The Far Side of the Sun

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


Sunspot Number: 43
What is the sunspot number?
Updated: 09 Sep 2003

Coronal Holes:

Earth is inside a solar wind stream flowing froom the indicated coronal hole. Image credit: SOHO Extreme UV Telescope
More about coronal holes

Interplanetary Mag. Field
Btotal: 6.0 nT
Bz:
0.1 nT south
explanation | more data
Updated: Today at 2246 UT


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 2003 Sep 10 2200 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 2003 Sep 10 2200 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 30 % 20 %
MINOR 10 % 05 %
SEVERE 01 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 35 % 25 %
MINOR 15 % 05 %
SEVERE 05 % 01 %

What's Up in Space -- 10 Sep 2003
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HARVEST MOON: There's a full moon tonight and it has a special name: the Harvest Moon. The Harvest Moon is the full moon closest to the beginning of northern Fall. Before the days of electric lights, farmers loved the Harvest Moon because its light extended the working day, allowing them to harvest crops after sundown. Useful. And lovely. Step out into the moonlight tonight and see for yourself.

AURORA OUTLOOK: Earth is inside a gusty solar wind stream flowing from a coronal hole on the sun. Such streams often trigger widespread auroras, but probably not this time. The interplanetary magnetic field (IMF) near Earth is tilting north--a condition which discourages geomagnetic storms.

Above: Proving once again that Alaska is aurora country, Chuck Johnson took this picture near Fairbanks on Sept. 9th when conditions were unfavorable for Northern Lights. "Despite a full moon and a north-leaning IMF, we had a decent show," he says.

Would you like a phone call when auroras appear over your home town? Sign up for Spaceweather PHONE.

CLOSE ENCOUNTER: When the Moon and Mars brushed by one another on Sept. 9th, Daisuke Tomiyasu of Kobe City, Japan, took this picture of the pair. Look closely; you can see the bright polar ice cap of Mars. The Moon has a bright spot, too--the rayed crater Tycho. (continued below)

More images: from Anthony Ayiomamitis of Greece; from Michel Benvenuto in Nice, France; from Simon Sin of the Hong Kong Astronomical Society; from Brad Potts of McCall, Idaho; from Chuck Johnson of Fairbanks, Alaska; from Anthony Arrigo of Utah; from Dan Widman of Grand Forks, North Dakota; from Ricky L. Jones of Racine, Wisconsin; and from Alfredo Garcia, Jr. who pointed his camera through a double-paned window in Tucson, Arizona; from Daniel Tardif of Quebec, Canada; from Michael Hoogstraaten of The Hague, The Netherlands; from Jean Michel Paille near Poitiers, France; from Les Marczi of the Royal Astronomical Society of Canada's Niagra Center; from Javaid Kazmi in Islamabad, Pakistan;



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 10 Sep 2003 there were 528 known Potentially
Hazardous Asteroids

September 2003 Earth-asteroid encounters
ASTEROID

 MISS DISTANCE

 MAG.
2003 RS1

Sept. 2

13 LD

 16
2003 RB5

Sept. 4

11 LD

 15
2003 RB

Sept. 28

38 LD

 17
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.

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; Jan-Mar., 2003; Apr-Jun., 2003;

Recent International Astronomical Union Circulars

GLOSSARY | SPACE WEATHER TUTORIAL

 

 

 




 

 
Editor's Note: Space weather and other forecasts that appear on this site are formulated by Dr. Tony Phillips. They are not official statements of any government agency (including NASA) nor should they be construed as guarantees of space weather or other celestial activity.

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Dr. Tony Phillips
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