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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids

SpaceWeather.com
Science news and information about the Sun-Earth environment.

SPACE WEATHER
Current
Conditions

Solar Wind
speed: 417.6 km/s
density:
20.2 protons/cm3
explanation | more data
Updated: Today at 2255 UT


X-ray Solar Flares

6-hr max:
C1 2120 UT Aug19
24-hr: C2 1125 UT Aug19
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 19 Aug '06

Sunspot 904 is about to disappear over the sun's western limb. Credit: SOHO/MDI


Sunspot Number: 29
What is the sunspot number?
Updated: 18 Aug 2006

Far Side of the Sun

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

Interplanetary Mag. Field
Btotal: 15.6 nT
Bz:
12.6 nT south
explanation | more data
Updated: Today at 2256 UT

Coronal Holes:

There are no deep coronal holes on the Earth-facing side of the sun today. 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 2006 Aug 19 2203 UTC
FLARE 0-24 hr 24-48 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 2006 Aug 19 2203 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 30 % 20 %
MINOR 15 % 10 %
SEVERE 05 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 35 % 25 %
MINOR 20 % 10 %
SEVERE 10 % 01 %

What's Up in Space -- 19 Aug 2006
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Did you miss the aurora surprise of August 7th? Next time get a wake-up call: Spaceweather PHONE.

GEOSTORM ALERT: A moderate geomagnetic storm is in progress . If you live at high latitudes and it's dark, go outside and look for auroras now.

MORNING PLANETS: Waking up at dawn is hard to do. It helps when a bunch of planets holler "good morning." Venus, Mercury, Saturn and the crescent Moon are converging for a pretty sunrise display on August 20 through 22. It's a nice way to begin the day.

SUNSPOT 904: "The sun keeps giving us mortals gift after gift of beautiful photo-ops," says Jack Newton of Osoyoos, British Columbia. He took this picture yesterday:


Sunspot 904, the view through a Coronado 90mm filter.

The photo-ops are about to end. Sunspot 904 is approaching the western limb of the sun. By Monday, it'll be over the edge and out of sight. Catch it while you can.

more images: from Pavol Rapavy of Rimavska Sobota, Slovakia; from Peter Hoebel of Erlangen, Germany; from Dennis Simmons of Brisbane, Qld, Australia; from Greg Piepol of Rockville, Maryland;

YELLOWKNIFE AURORAS: On August 18th while sky watchers were waiting for a CME to hit and spread auroras around the globe, Erik Bech was already enjoying a colorful display--no CME required:

He took this picture from Yellowknife, Canada, a place where auroras have a habit of appearing for no particular reason. A little gust of solar wind or a twitch of the interplanetary magnetic field (IMF) is all it takes to produce bright Northern Lights. Yellowknife's secret? It's located near the Arctic Circle in the heart of aurora country.

In September and October, 2006, the rest of the world will become a bit more like Yellowknife. For reasons not fully understood, the early months of northern fall are prime time for aurora watching. Earth's magnetic field becomes especially prone to storming, producing Northern Lights in places where they are seldom seen. Aurora season is coming; stay tuned!



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 is on a collision course with our planet, although astronomers are finding new ones all the time.

On 19 Aug 2006 there were 801 known Potentially
Hazardous Asteroids

August 2006 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
2006 ON1

Aug 20

16.6 LD

18

230 m
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

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.

Lists of Coronal Mass Ejections -- from 1998 to 2001

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1996, 1997, 1998, 1999; 2000; 2001; 2002; 2003; 2004; 2005; Jan-Mar 2006;

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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