|   SPACE WEATHER
Current
Conditions
Solar Wind
velocity: 409.7 km/s
density:2.1 protons/cm3
explanation | more data
Updated: Today at 2255 UT
X-ray Solar Flares
6-hr max: M4 2035 UT Sep11
24-hr: M4 2035 UT Sep11
explanation | more data
Updated: Today at 2245 UT
Daily Sun: 11 Sep '01 
Active region 9608 has a delta-class magnetic field that harbors energy for possible X-class flares. 9607 has a beta-gamma magnetic field that could unleash M-class blasts. Image credit: SOHO/MDI
The Far Side of the Sun
This holographic image reveals a substantial sunspot on the far side of the Sun. It is probably active region 9591, which during the end of August unleashed a powerful X5-class solar flare. Image credit: SOHO/MDI
Sunspot Number: 217
More about sunspots
Updated: 10 Sep 2001
Radio Meteor Rate
24 hr max: 25 per hr
Listen to the Meteor Radar!
Updated: 09 Sep 2001 Interplanetary Mag. Field
Btotal: 11.6 nT
Bz: 6.8 nT south
explanation | more data
Updated: Today at 2256 UT Coronal Holes:
A small coronal hole is approaching the Sun's central meridian. Image credit: SOHO Extreme UV Telescope.
More about coronal holes
 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 2001 Sep 11 2200 UT
| FLARE | 0-24 hr | 24-48 hr | | CLASS M | 80 % | 80 % | | CLASS X | 15 % | 15 % |
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 Sep 11 2200 UT 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 % | 25 % | | MINOR | 20 % | 15 % | | SEVERE | 05 % | 05 % |
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| What's Up in Space -- 11 Sep 2001
Subscribe to Space Weather News! SOLAR WIND GUSTS: Earth entered a solar wind stream around 11:00 UT (7:00 am EDT) on September 11th. The interplanetary magnetic field (IMF) near Earth is pointing south -- a condition which renders our planet's magnetosphere vulnerable to solar wind gusts. High latitude sky watchers should be alert for auroras after local nightfall. 
Above: NASA's ACE spacecraft registered an increase in the solar wind velocity around 11:00 UT on Sept. 11, 2001. SUNSPOT WATCH: An impressive sunspot complex, sprawling 30 Earth diameters from end to end, is crossing the Sun's central meridian today.Magnetograms of the region reveal a twisted delta-class magnetic field that could harbor energy for powerful X-class solar flares. 
Above: These data, spanning September 3rd through 9th, are courtesy of the NASA/ESA Solar and Heliospheric Observatory. You can see these sunspots for yourself. But never look directly at the Sun! Use safe solar projection methods instead. WEB LINKS: NOAA FORECAST | GLOSSARY | SPACE WEATHER TUTORIAL | LESSON PLANS | BECOME A SUBSCRIBER | 
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 11 Sep 2001 there were 318 known Potentially
Hazardous Asteroids Sep-Oct. 2001 Earth-asteroid encountersNotes: 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. 
- PERSEIDS 2001: Perseid watchers on August 12th spotted meteors, auroras, and a disintegrating Russian rocket! [gallery]
- MORNING PLANETS: In July and Aug. 2001, the Moon, Jupiter, Saturn, Venus, and Mercury put on a dazzling early-morning sky show. [gallery]
- C/2001 A2 (LINEAR): This volatile comet is still visible through small telescopes as it recedes from Earth. [gallery]
- ECLIPSE SAFARI: Onlookers cried out in delight on June 21, 2001, when the Moon covered the African Sun, revealing the dazzling corona. [gallery]
- 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]
 July 27, 2001: Meteorites Don't Pop Corn -- A fireball that dazzled Americans on July 23rd probably didn't scorch any cornfields, contrary to widespread reports. June 12, 2001: The Biggest Explosions in the Solar System -- NASA's HESSI spacecraft aims to unravel an explosive mystery: the origin of solar flares. Feb. 21, 2001: Nature's Tiniest Space Junk -- Using an experimental radar, NASA scientists are monitoring tiny but hazardous meteoroids that swarm around our planet. Feb. 15, 2001: The Sun Does a Flip -- NASA scientists who monitor the Sun say our star's enormous magnetic field is reversing -- a sure sign that solar maximum is here. 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. MORE SPACE WEATHER HEADLINES |
