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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: 369.7 km/sec
density: 11.8 protons/cm3
explanation | more data
Updated: Today at 2246 UT
X-ray Solar Flares
6-hr max: A0
2245 UT Jul28
24-hr: B1
0720 UT Jul28
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 28 July 07
A new sunspot is emerging; the sun is no longer blank. Credit: SOHO/MDI
Sunspot number: 0
What is the sunspot number?
Updated 27 July 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= 0 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 28 2127 UT
Interplanetary Mag. Field
Btotal: 4.5 nT
Bz: 2.1 nT south
explanation | more data
Updated: Today at 2246 UT
Coronal Holes:
A solar wind stream flowing from the indicated coronal hole will reach Earth on or about July 30th. Credit: SOHO Extreme Ultraviolet Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Jul 28 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 28 2203 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
05 %
05 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
10 %
10 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
What's up in Space
July 28, 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.

NEW SUNSPOT: The sun is no longer blank; a new sunspot is breaching the surface. Maxim Usatov photographed it this morning from his backyard in Dniepropetrovsk, Ukraine: image. The 'spot is small now, but growing rapidly. Amateur astronomers with solar telescopes may wish to monitor developments.

more images: from P-M Hedén of Vallentuna, Sweden; from Howard Eskildsen of Ocala, Flordia; from Tony Pirie of Essex, UK; from Emiel Veldhuis and Willy Buning of Zwolle, the Netherlands; from Cai-Uso Wohler of Bispingen, Germany; a sketch from Eric Soucy-Lacroix of Ohain, Belgium.

ANTARCTIC SUNRISE: "This might look like a very ordinary sunrise, but for our expedition overwintering in Antarctica, this was a very welcome return of the sun after a 10 week absence!" says Chantal Steyn, a member of the South African National Antarctic Expedition in Dronning Maudland (Queen Maud Land).

She snapped the photo on July 26th. "It lasted little more than an hour," she says, "but brought the promise of a well earned and long awaited summer." It promises something different for people in the north--relief from the heat. The sun really is heading south, and autumn is only 57 days away.

PHASES OF VENUS: Photographer Dave Gradwell of Birr, Ireland, calls this composite picture "New Venus in Old Venus's Arms."

"The smaller Venus is from March 15th, while the larger is from July 23rd," he says. During that time Venus has swollen from a 12-arcsecond gibbous planet to a whopping 44-arcsecond crescent. Yes, Venus has phases, and you can see the crescent phase now. Point your backyard telescope low and west at sunset; brilliant Venus pops out of the darkening sky before any other planet or star.


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

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 28, 2007 there were 876 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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