SPACE WEATHER Current Conditions Solar Wind speed: 494.3 km/s density:4.8 protons/cm3 explanation | more data Updated: Today at 2246 UT X-ray Solar Flares 6-hr max: C3 1950 UT Jul17 24-hr: M7 0710 UT Jul17 explanation | more data Updated: Today at 2245 UT Daily Sun: 17 July '02 Sunspot 30 has a twisted beta-gamma-delta magnetic field that poses a threat for X-class solar flares. Image credit: SOHO/MDI The Far Side of the Sun This holographic image reveals a southern sunspot on the far side of the Sun. Image credit: SOHO/MDI Sunspot Number: 182 More about sunspots Updated: 16 Jul 2002 Coronal Holes: A solar wind gusts from the indicated coronal hole could strike Earth's magnetic field as early as July 20. Image credit: SOHO Extreme UV Telescope. More about coronal holes Interplanetary Mag. Field Btotal: 7.7 nT Bz: 3.8 nT south explanation | more data Updated: Today at 2247 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 2002 Jul 17 2200 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 2002 Jul 17 2200 UTC Mid-latitudes | 0-24 hr | 24-48 hr | ACTIVE | 40 % | 25 % | MINOR | 20 % | 10 % | SEVERE | 10 % | 01 % | High latitudes | 0-24 hr | 24-48 hr | ACTIVE | 45 % | 30 % | MINOR | 20 % | 15 % | SEVERE | 10 % | 05 % | Web server provided by VPS Hosting | What's Up in Space -- 17 Jul 2002 Subscribe to Space Weather News! IMPACT: A coronal mass ejection that left the Sun on Monday, July 15th, swept past our planet today at 1600 UT (9:00 PDT). The impact triggered some geomagnetic activity--but not a full-fledged storm. Stay tuned for updates. HEAVENLY HALO: A lovely full-halo coronal mass ejection (CME) raced away from the Sun on Tuesday, July 16th, at 1630 UT. Unfortunately for sky watchers, this CME was a "backside event." It is heading directly away from our planet and will not trigger Northern Lights. BIG SUNSPOT: Sunspot 30 is big. It stretches fifteen Earth-diameters from end to end, and covers an area equal to about twenty Pacific oceans. You can see the spot yourself--but never stare directly at the Sun. Use safe solar projection methods. The active region has a twisted "delta-class" magnetic field that harbors energy for powerful X-class eruptions. Above: Sunspot 30. Mike Peoples of Monatgue, NJ, captured this image using a Nikon Coolpix 950 digital camera (1/30s), a Televue 4-inch refracting telescope and a Baader Solar Filter. A BUNCH OF PLANETS: Jupiter, Mars and Mercury will soon (July 17-- July 27) appear remarkably close together in the sky. But don't bother looking. The trio are too near the glaring Sun; you can't see them without hurting your eyes. The orbiting Solar and Heliospheric Observatory, however, can. SOHO's coronagraph blocks the Sun's blinding glare with an opaque disk, revealing stars, planets and the Sun's faint corona. SOHO captured the above coronagraph image on July 15th. Later this week Mars will join Mercury and Jupiter in the field of view. (Note: the horizontal lines are digital imaging artifacts, not planetary rings.) 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 17 Jul 2002 there were 447 known Potentially Hazardous Asteroids June-July 2002 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. - CRESCENT SUN: The June 10th solar eclipse is long over, but new pictures of the event keep appearing. Visit our growing photo gallery and see for yourself. There are strange shadows, weird sunsets, eclipse dogs, crescent-eyed turkeys and extraordinary rings of fire. [more]
- COMET IKEYA-ZHANG: The brightest comet in years delighted sky watchers in March and April 2002. [gallery]
- GONE JUPITER: On Feb. 22, 2002, the Moon had a close encounter with Jupiter. [gallery]
- GONE SATURN: On Feb. 20, 2002, the Moon glided in front of Saturn and its mysterious rings. [gallery]
- HOT COMET: Periodic comet 96P/Machholz put on a dazzling show as it swung by the Sun on Jan. 8, 2002.
- ASTEROID FLYBY: Asteroid 2001 YB5 raced past Earth on Jan. 7, 2002, only two times farther away than the Moon. [gallery]
- SUBTLE ECLIPSE: The Moon dipped into the outskirts of Earth's shadow on Dec. 30, 2001. [gallery]
- MOON & SATURN: The Moon keeps getting in the way of Saturn! See the series of close encounters here.
- CHRISTMAS LIGHTS: On Christmas Eve, 2001, a solar wind stream triggered Northern Lights. [gallery]
- SOLAR ECLIPSE: Sky watchers in Hawaii and most parts of North America experienced a partial solar eclipse on Dec. 14th. [gallery]
- BRIGHT ASTEROID: Videos and images of 1998 WT24 -- a big and bright near-Earth asteroid that came close to our planet on Dec. 16, 2001. [gallery]
- NORTHERN LIGHTS: On Nov. 24th a pair of coronal mass ejections swept past Earth and triggered worldwide auroras.
- LEONIDS 2001: Some people saw it. Others heard it. In either case, they'll never forget it: The 2001 Leonid meteor storm.
- 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]
- 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]
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