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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
SPACE WEATHER
Current conditions
Solar wind
speed: 517.1 km/sec
density: 1.8 protons/cm3
explanation | more data
Updated: Today at 2245 UT
X-ray Solar Flares
6-hr max: A0
2245 UT Sep25
24-hr: A0
2245 UT Sep25
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 25 Sep 07
The sun is blank--no sunspots. Credit: SOHO/MDI
Sunspot number: 0
What is the sunspot number?
Updated 24 Sep 2007
Far side of the Sun:
This holographic image reveals no sunspots on the far side of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 3 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Current Auroral Oval:

Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Updated: 2007 Sep 25 2139 UT
What is the auroral oval?
Interplanetary Mag. Field
Btotal: 3.2 nT
Bz: 0.1 nT north
explanation | more data
Updated: Today at 2236 UT
Coronal Holes:
A solar wind stream flowing from the indicated coronal hole should reach Earth on Sept. 27th or 28th. Credit: SOHO Extreme UV Telescope.
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Sep 25 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 Sep 25 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 %
20 %
MINOR
10 %
10 %
SEVERE
01 %
01 %

What's up in Space
September 25, 2007
Where's Saturn? Is that a UFO--or the ISS? What's the name of that star? Get the answers from mySKY--a fun new astronomy helper from Meade. .

AURORA WATCH: Earth is exiting one solar wind stream that sparked bright auroras over the weekend. Another solar wind stream is on the way, due to arrive Sept 27th. High latitude sky watchers should remain alert for Northern Lights.

HARVEST MOON: There's a full moon tomorrow night and it has a special name--the Harvest Moon. In the days before electric lights, farmers relied on moonlight to help them gather ripening autumn crops. The "Harvest Moon" rising brightly in the east at sunset allowed work to continue late into the night.

Post-Edison, we appreciate the Harvest Moon mainly for its beauty:


Photo details: Canon Digital Rebel XT, Orion 80ED. More: #1, #2, #3

P-M Hedén took this picture last night in Vallentuna, Sweden. The waxing Harvest Moon is surrounded by a blue and straw-colored corona created by water droplets in misty, low hanging clouds. Imagine the view on Wednesday when the Moon is actually full!

more images: from Milan Gucic of Belgrade, Serbia; from John E Cordiale at Yellowstone National Park in Wyoming, USA; from Mark Seibold of Troutdale Oregon, USA.

SHADOWS OF VENUS: Venus is so bright, it actually casts shadows. You just have to stare a while to see them. This 6-minute exposure at ISO 800 comes from Tenho Tuomi of Lucky Lake, Saskatchewan, Canada:

"Venus projected the shadow of my telescope on the house wall," he marvels.

To experience your own Venus shadow, chose a dark place--very dark--away from city lights. Go there just before dawn. No sky map is necessary to find Venus glaring in the east. Let your eyes fully dark-adapt as the silvery light of the Morning Star illuminates your face. Now turn around. What do you see?

BONUS: Got a backyard telescope? Point it at Venus. Like the Moon, Venus has phases, and at the moment it is a beautifully slender crescent. Take a look!


September 2007 Aurora Gallery
[August 2007 Aurora Gallery] [Aurora Alerts]

Near-Earth Asteroids
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 September 25, 2007 there were 887 potentially hazardous asteroids.
Sept. 2007 Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2007 RF1
Sep. 2
8.5 LD
18
26 m
2007 RS1
Sep. 5
0.2 LD
17
3 m
2007 RJ1
Sep. 16
2.5 LD
16
40 m
2007 RC20
Sep. 20
5.1 LD
19
22 m
Notes: LD means "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 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.
Daily Sunspot Summaries
  From the NOAA Space Environment Center
Current Solar Images
  from the National Solar Data Analysis Center
  more links...
©2007, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.
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