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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: 328.4 km/s
density:
10.5 protons/cm3
explanation | more data
Updated: Today at 2247 UT


X-ray Solar Flares

6-hr max:
A2 1830 UT Oct06
24-hr: A4 1550 UT Oct06
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 06 Oct '06

These sunspots pose no threat for solar flares. Credit:
SOHO/MDI

Sunspot Number: 27
What is the sunspot number?
Updated: 05 Oct 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: 1.9 nT
Bz:
1.8 nT north
explanation | more data
Updated: Today at 2247 UT

Coronal Holes:

There are no large coronal holes on the Earth-facing side of the sun today. Credit: NOAA GOES-13.


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 Oct 06 2204 UTC
FLARE 0-24 hr 24-48 hr
CLASS M 01 % 01 %
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 Oct 06 2204 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 10 % 10 %
MINOR 05 % 05 %
SEVERE 01 % 01 %

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

What's Up in Space -- 6 Oct 2006
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Autumn is here, and it's a wonderful time for stargazing. Find out what's up from Spaceweather PHONE.

DARK FILAMENT: A dark filament is snaking across the sun today: image. Filaments are clouds of hydrogen held above the sun's surface by magnetic force fields. This one is remarkably long--more than 250,000 miles from end to end. If you have a solar telescope, take a look.

HARVEST MOON: Tonight's full moon has a special name--the "Harvest Moon." It's the full moon closest to the autumnal equinox. Long ago, before electric lights, farmers relied on the Harvest Moon to light up their fields at night, allowing them to harvest autumn crops even after sunset.

When the Harvest Moon rises tonight, go outside and look around. You might see some strange things.


Photo credit: Andy Skinner of Mariposa, California.

Extra: This particular Harvest Moon is unusually big--almost 12% wider than some full Moons we've seen earlier this year. Why? Because the Moon is near perigee, the side of the Moon's lopsided orbit that comes closest to Earth.

LUNAR AUREOLE: "Last night, I was letting the dogs out and taking the trash to the curb, when I looked up and noticed a straw-colored ring around the Moon," says Erika Rix of Zanesville, Ohio. "I immediately dropped the trash and could hear a tin can rolling down the driveway as I ran back into the house for a camera." She took these pictures:

This is a lunar aureole, cousin to the better-known lunar corona. Both are caused by water droplets in clouds. When the droplets are a jumble of different sizes, they produce a straw-colored ring--an aureole. When the droplets are all of the same size they produce a rainbow-colored ring--a corona. Look for both tonight!



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 6 Oct 2006 there were 803 known Potentially
Hazardous Asteroids

Aug-Sept 2006 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
2006 QM111

Aug 31

0.4 LD

21

13 m
2006 QQ56

Sept. 2

7.9 LD

18

29 m
2006 QV89

Sept. 5

7.9 LD

18

40 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.

Recommended: Earth & Sky

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.

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;

GLOSSARY | SPACE WEATHER TUTORIAL

This site is penned daily by Dr. Tony Phillips: email


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