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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: 564.9 km/s
density:
2.4 protons/cm3
explanation | more data
Updated: Today at 2246 UT

X-ray Solar Flares
6-hr max:
A0 2240 UT Mar27
24-hr: A0 2240 UT Mar27
explanation | more data
Updated: Today at 2245 UT

Daily Sun: 27 Mar '07

Yesterday's new sunspot 948 is already dissolving; the sun will soon be blank again. Credit: SOHO/MDI

Sunspot Number: 17
What is the sunspot number?
Updated: 26 Mar 2007

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: 7.1 nT
Bz:
4.6 nT north
explanation | more data
Updated: Today at 2247 UT

Coronal Holes:

Earth is inside a solar wind stream flowing from the indicated coronal hole. 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 2007 Mar 27 2203 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 2007 Mar 27 2203 UTC
Mid-latitudes
0-24 hr 24-48 hr
ACTIVE 15 % 15 %
MINOR 05 % 05 %
SEVERE 01 % 01 %

High latitudes
0-24 hr 24-48 hr
ACTIVE 20 % 15 %
MINOR 10 % 05 %
SEVERE 05 % 01 %

What's Up in Space -- 27 Mar 2007
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Did you miss last night's auroras? Next time get a wake-up call from Spaceweather PHONE.

PROMINENCE ALERT: A large prominence is dancing over the sun's southwestern limb, reports Les Cowley of England, who spotted it this morning while looking through his Personal Solar Telescope. "In spite of their immense size, prominences evolve fast; this one was visibly changing as I drew it."

FIRST SATURN OF SPRING: "Saturn is now perfectly placed for observing just after sundown," says astrophotographer Alan Friedman. "I took this picture on March 20th in the hours just after the vernal equinox--my first Saturn of Spring!"

Saturn's blue north pole, the Cassini division in Saturn's rings, and at least four moons are visible in the full-sized image.

Such a picture must have been taken at a fully-staffed professional observatory, right? Wrong. Friedman worked alone using a 10-inch backyard telescope in light-polluted Buffalo, New York. If you have a telescope, point it at Saturn tomorrow night, March 28th. The ringed planet will be unusually easy to find right beside the Moon: sky map.

DROPLETS WITH A BONUS: Looking at the world through a water droplet can be a little disorienting. Droplets are natural inverting lenses, forming an upside-down image of objects beyond. This also makes them attractive targets for off-beat photography.

Last Saturday, "we had a foggy morning which caused droplets of water to be hanging on the end of tree branches," reports Lois Reinert of Tracy, MN. "When I took my camera out to photograph those droplets, I noticed something quite interesting." (continued below)


Photo details: Nikon Coolpix 5700 on macro mode.

"There were tiny little droplets attached to spider web strands that were located on the tree branches. If those tiny droplets were big enough, you could see the inverted images in them, too. I think of them as droplets with a bonus." more images: #1, #2, #3.



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 27 Mar 2007 there were 853 known Potentially
Hazardous Asteroids

March 2007 Earth-asteroid encounters
ASTEROID

 DATE
(UT)

MISS DISTANCE

MAG.

 SIZE
2007 EH

Mar. 11

0.5 LD

16

10 m
2007 EK

Mar. 13

0.7 LD

18

5 m
2006 VV2

Mar. 31

8.8 LD

10

2 km
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.

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 -- from the National Solar Data Analysis Center

Recent Solar Events -- a summary of current solar conditions from lmsal.com.

What is the Magnetosphere?

The Lion Roars -- visit this site to find out what the magnetosphere sounds like.

List of Potentially Hazardous Asteroids -- from the Harvard Minor Planet Center.

Observable Comets -- from the Harvard Minor Planet Center.

Real-time Solar Wind Data -- from NASA's ACE spacecraft.

How powerful are solar wind gusts? Not very! 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 1996 to 2006

Mirages: Mirages in Finland; An Introduction to Mirages;

NOAA Solar Flare and Sunspot Data: 1994, 1995, 1996, 1997, 1998, 1999; 2000; 2001; 2002; 2003; 2004; 2005; Jan-Mar 2006; Apr-Jun 2006; Jul-Sep 2006; Oct-Dec 2006.

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


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