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Space Weather Bureau
Science news and information about the Sun-Earth environment.


Solar Wind

velocity: 454.7 km/s
6.0 protons/cm3
explanation | more data
Updated: Today at 2147 UT

X-ray Solar Flares

6-hr max:
C4 2035 UT Feb12
24-hr: C4 2035 UT Feb12
explanation | more data
Updated: Today at 2345 UT

Daily Sun: 12 Feb '01
Sunspot group 9338 may be simplifying after its rapid growth during the weekend. It now exhibits a beta-class magnetic field that is less likely to produce strong solar flares.

Sunspot Number: 169
More about sunspots
Updated: 11 Feb 2001

Radio Meteor Rate
24 hr max:
33 per hr
Listen to the Meteor Radar!
Updated: 12 Feb 2001

Interplanetary Mag. Field
Btotal: 10.3 nT
4.8 nT south
explanation | more data
Updated: Today at 2148 UT

Coronal Holes:

There are no substantial coronal holes on the Earth-facing side of the Sun. Image credit: SOHO Extreme UV Telescope.
More about coronal holes


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 2001 Feb 12 2200 UT

FLARE 24 hr 48 hr
CLASS M 10 % 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 2001 Feb 12 2200 UT

24 hr 48 hr
ACTIVE 10 % 20 %
MINOR 05 % 10 %
SEVERE 01 % 05 %

High latitudes
24 hr 48 hr
ACTIVE 20 % 30 %
MINOR 05 % 10 %
SEVERE 05 % 05 %

What's Up in Space -- 12 Feb 2001
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HALO CME: Early Sunday morning (0130 UT) a coronal mass ejection (CME) left the Sun traveling approximately 670 km/s. Although the brightest part of the eruption billowed away from the Sun's northwest limb (and away from Earth), SOHO coronagraphs spotted a faint halo component as well -- some of the ejecta is certainly Earth-bound. [CME animations: view the big picture or a zoom shot]

The expanding cloud is likely to reach our planet late Monday or Tuesday and deliver a glancing blow to Earth's magnetosphere. Sky watchers at geomagnetic latitudes above ~55 degrees should be alert for auroras after local nightfall on those days. [NOAA maps of geomagnetic latitude: North America, Eurasia, Australia]

FAST-GROWING SUNSPOT: Active region 9338, which was nearly invisible just last Friday, is now the largest spot on the solar disk. The active region's rapidly-changing magnetic field developed a beta-gamma configuration on Sunday that could harbor energy for M-class solar flares.

Above: This animation of SOHO white light images shows the growth of sunspot 9338 from Feb. 8th through 11th.

ASTEROID FLYBY: Near-Earth asteroid 2001 WO148 will fly by our planet February 15th at 15:28 GMT. At closest approach the 400-meter wide space rock will be 65 lunar distances from Earth -- there is no threat of a collision. [see the 3D orbit]


  • TOTAL LUNAR ECLIPSE: On Jan. 9, 2001, the full Moon glided through Earth's copper-colored shadow. [gallery]
  • CHRISTMAS ECLIPSE: Sky watchers across North America enjoyed a partial solar eclipse on Christmas Day 2000 [gallery]
  • LEONIDS 2000: Observers around the globe enjoyed three predicted episodes of shooting stars. [gallery]

Jan. 25, 2001: Earth's Invisible Magnetic Tail -- NASA's IMAGE spacecraft, the first to enjoy a global view of the magnetosphere, spotted a curious plasma tail pointing from Earth toward the Sun.

Jan. 4, 2001: Earth at Perihelion -- On January 4, 2001, our planet made its annual closest approach to the Sun.

Dec. 29, 2000: Millennium Meteors -- North Americans will have a front-row seat for a brief but powerful meteor shower on January 3, 2001.

Dec. 28, 2000: Galileo Looks for Auroras on Ganymede -- NASA's durable Galileo spacecraft flew above the solar system's largest moon this morning in search of extraterrestrial "Northern Lights"

Dec. 22, 2000: Watching the Angry Sun -- Solar physicists are enjoying their best-ever look at a Solar Maximum thanks to NOAA and NASA satellites.

Dec. 18, 2000: Ursid Meteor Surprise -- The normally meek Ursid meteor shower could surprise sky watchers with a powerful outburst on Dec 22nd.

Dec. 8, 2000: The Baffling Geminid Meteor Shower -- Most meteor showers are caused by comets, but the Geminids, which peak on December 13th, seem to come from a curious near-Earth asteroid.

Nov. 22, 2000: A Solar Flare Stuns Stardust -- Earlier this month an intense solar radiation storm temporarily blinded NASA's Stardust spacecraft en route to comet Wild-2.

Nov. 21, 2000: Leonids Galore -- Find out what happened during the 2000 Leonids meteor shower.

Nov. 7, 2000: Much Ado about 2000 SG344 -- In 2071 a relic of NASA's earliest space exploration efforts might return to Earth, if current estimates are confirmed.

Oct. 26, 2000: Lunar Leonids -- On Nov. 17, 2000, the moon will plow through a stream of debris from comet Tempel-Tuttle.

Oct. 10, 2000: The Moonlit Leonids 2000 -- Our planet is heading for a minefield of cosmic dust streams laid down by periodic comet Tempel-Tuttle. The result could be a series of meteor outbursts on Nov. 17 and 18, 2000.


Editors Note: Space weather forecasts that appear on this site are based in part on data from NASA and NOAA satellites and ground-monitoring stations. These predictions are not necessarily sanctioned by either organization. is maintained by Dr. Tony Phillips.

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.

The Latest SOHO Coronagraph Images -- from the Naval Research Lab

The Latest Space Weather Values -- from the NOAA Space Environment Center.

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.

Real-time Solar Wind Data -- from NASA's ACE spacecraft.

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.

Quarterly Solar Flare and Sunspot Data: January - March 2000 -- from the NOAA Space Environment Center.

Quarterly Solar Flare and Sunspot Data: April - June 2000 -- from the NOAA Space Environment Center.

Quarterly Solar Flare and Sunspot Data: July - Sept 2000 -- from the NOAA Space Environment Center.

Quarterly Solar Flare and Sunspot Data: Oct. - Dec. 2000 -- from the NOAA Space Environment Center.

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