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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: 398.1 km/sec
density: 0.8 protons/cm3
explanation | more data
Updated: Today at 2245 UT
X-ray Solar Flares
6-hr max: B1
2150 UT Jul01
24-hr: B2
0825 UT Jul01
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 01 July 07
These sunspots pose no threat for strong solar flares. Credit: SOHO/MDI
Sunspot number: 36
What is the sunspot number?
Updated 30 June 2007
Far side of the Sun:
This holographic image reveals no sunspots on the farside of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
quiet
explanation | more data
Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Updated: 2007 Jul 01 2137 UT
Interplanetary Mag. Field
Btotal: 4.5 nT
Bz: 0.9 nT south
explanation | more data
Updated:Today at 2246 UT
Coronal Holes:
There are no large coronal holes on the Earth-facing side of the sun. Credit: SOHO Extreme Ultraviolet Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Jul 01 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 Jul 01 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
July 1, 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.

VENUS AND SATURN, SIDE-BY-SIDE: This weekend, Venus and Saturn are putting on a lovely show in the evening sky. "In commemoration of our country's upcoming Independence Day celebration, we chose to photograph the planets from historic Concord, Massachusetts," say Imelda Joson and Edwin Aguirre. (continued below)

"In this shot, Venus and Saturn appear beside the Minute Man Monument at the foot of Old North Bridge, where the first shots of the American Revolution were fired in 1775."

The show's not over: The two planets are still side-by-side tonight, barely 1o apart. Look for them after sunset as the twilight sky fades to black: sky map.

more images: from Mohammad Javad Fahimi of Kerman, Iran; from Miguel De La Torre of Playas de Tijuana, Tijuana B.C. Mexico; from Sorin Hotea of Alba Iulia, Romania; from Marcelo Bissaro of Campinas, Brazil; from Wade Howlett of Bullsbrook, Western Australia; from Mariano Ribas of Buenos Aires, Argentina; from John Sachs of Hanover, Pennsylvania; from Daniel Ethier of Woodbury, Minnesota; from Keith Aaron of Frederick, Maryland; from Simon Chan of Perth, Western Australia; from Peter Naglič of near Celje, Slovenia; from Ivica Skokic of Zagreb, Croatia; from Peter Rosén of Stockholm, Sweden; from Stan Richard at the Ashton Observatory near Des Moines, Iowa;

AT THE DOORSTEP OF SPACE: Noctilucent clouds (NLCs) float much higher than ordinary clouds, as shown in this June 29th photo from Viktor Veres of Mogyorod, Hungary:

"The dark clouds in the foreground are common altostratus clouds (4 to 5 km high)," says Veres. In the background are NLCs, located 80+ km above Earth's surface. This puts them at the doorstep of space itself.

This altitude difference explains why NLCs glow at night. NLCs are so far above Earth's surface, they are able to catch the rays of the sun even when it's dark near the ground. (The International Space Station glows at night for the same reason.) The blue color of NLCs comes from scattering of sunlight by very tiny ice crystals in the clouds; blue is scattered more than other colors.

Noctilucent clouds have been very active in recent weeks, so be alert! Watch the sky about an hour after sunset. If you see electric-blue tendrils spreading up from the western horizon, you've probably spotted an NLC.

June 2007 Noctilucent Cloud Gallery
["Noctilucent Cloud"--the song] [Night-Sky Cameras]

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 July 1, 2007 there were 874 potentially hazardous asteroids.
July 2007 Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2007 FV42
July 2
53 LD
15
1.2 km
2007 MB4
July 4
7.6 LD
16
130 m
2007 DT103
July 29
9.3 LD
15
550 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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