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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: 352.6 km/s
density:
4.0 protons/cm3
explanation | more data
Updated: Today at 2245 UT


X-ray Solar Flares

6-hr max:
B1 1950 UT Nov01
24-hr: B1 1950 UT Nov01
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 01 Nov '05

Sunspots 818 and 819 pose no threat for strong solar flares. Credit: SOHO/MDI


Sunspot Number: 29
What is the sunspot number?
Updated: 31 Nov 2005

Far Side of the Sun

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

Interplanetary Mag. Field
Btotal: 5.6 nT
Bz:
1.4 nT north
explanation | more data
Updated: Today at 2246 UT

Coronal Holes:

A solar wind stream flowing from the indicated coronal hole could reach Earth on Nov. 4th or 5th. Image 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 2005 Oct 31 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 2005 Oct 31 2204 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 20 % 15 %
MINOR 05 % 01 %
SEVERE 01 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 25 % 20 %
MINOR 10 % 05 %
SEVERE 05 % 01 %

What's Up in Space -- 1 Nov 2005
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AURORA WATCH: A solar wind stream will hit Earth's magnetic field on Nov. 4th or 5th, possibly causing a geomagnetic storm. Sky watchers in Alaska and Canada should be alert for auroras.

FADING SPACESHIP: The International Space Station (ISS) will be flying over the United States and Europe this month. If you see it, you'll be impressed by how bright it is. The station reflects a lot of sunlight.

Photographer Dennis Mamanna reports "the station was very bright last night when it passed over Borrego Springs, California." And then it faded: (continued below)

What happened? Simple: The station entered Earth's shadow. Astronauts looking out the window of the ISS saw the sun set behind Earth's limb. They entered orbital night, and the station went dark.

"Notice how the trail reddens as ISS becomes more and more illuminated by the 'setting' sun," says Mamanna. "I had never seen this before, but I'll try to photograph it better next time."

PACIFIC SUNSET: Mila Zinkova of San Francisco likes to photograph the sun setting over the Pacific Ocean. No wonder. She frequently captures scenes like this one, yesterday:

Here is the recipe for such a sunset: "Put a warm breeze from inland over air chilled by cold ocean currents," says atmospheric optics expert Les Cowley. "The sun's rays are then abnormally bent as they pass between the hot and cold layers to form a mock mirage. The sun itself splits into layers, some are distorted and even turned upside down--the sun constantly changes and you might even see a piece break away to form a green or blue flash."



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 1 Nov 2005 there were 719 known Potentially
Hazardous Asteroids

August 2005 Earth-asteroid encounters
ASTEROID

 DATE (UT)

 MISS DISTANCE

 MAG.
1992 UY4

August 8

16 LD

 12
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

The Sun from Earth -- daily images of our star from the Big Bear Solar Observatory

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.

Aurora Forecast --from the University of Alaska's Geophysical Institute

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; Jan-Mar 2005; Apr-Jun 2005; Jul-Sep 2005; Oct-Dec 2005;

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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