You are viewing the page for Aug. 24, 2007
  Select another date:
<<back forward>>
SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
SPACE WEATHER
Current conditions
Solar wind
speed: 297.5 km/sec
density: 5.1 protons/cm3
explanation | more data
Updated: Today at 2246 UT
X-ray Solar Flares
6-hr max: A5
1935 UT Aug24
24-hr: C1
0755 UT Aug24
explanation | more data
Updated: Today at: 2245 UT
Daily Sun: 23 Aug 07
New sunspot 969 poses no threat for strong solar flares. Credit: SOHO/MDI.
Sunspot number: 12
What is the sunspot number?
Updated 23 Aug 2007
Far side of the Sun:
This holographic image reveals no large sunspots on the far side of the sun. Image credit: SOHO/MDI
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 1
quiet
explanation | more data
Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Updated: 2007 Aug 24 2149 UT
Interplanetary Mag. Field
Btotal: 3.2 nT
Bz: 2.1 nT south
explanation | more data
Updated: Today at 2246 UT
Coronal Holes:
A solar wind stream flowing from this coronal hole should reach Earth on or about Aug. 26th. Credit: SOHO Extreme Ultraviolet Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2007 Aug 24 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 Aug 24 2203 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
20 %
MINOR
10 %
10 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
25 %
25 %
MINOR
15 %
15 %
SEVERE
05 %
05 %
What's up in Space
August 24, 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.

BEWARE THE MARS HOAX: A rumor is going around: On Aug. 27th Mars will swell to the size of the full Moon. Don't believe it. Mars will look perfectly normal on Aug. 27th. But there is something eerie and Martian to look for in the sky next week. Get the full story from Science@NASA.

SOLAR ERUPTION: Although the sun is near the lowest ebb of its 11-year activity cycle, spectacular eruptions are still possible. NASA's Stereo-A spacecraft recorded one just last week on August 18th. Click on the image to play the 2.2 MB movie:

This is a solar prominence, a cloud of hydrogen held above the surface of the sun by magnetic force fields. Stereo A photographed the prominence just as the magnetic fields became unstable, producing a twisting, spouting eruption large enough to swallow Earth many times over. Soon, Stereo A will combine data with its sister ship Stereo B on a regular basis. The resulting 3D images will give researchers an unprecedented view of the inner workings of solar activity: more.

GIGANTIC JETS: Think of them as sprites on steroids: Gigantic Jets are lightning-like discharges that spring from the top of thunderstorms, reaching all the way from the thunderhead to the ionosphere 50+ miles overhead. They are enormous and powerful.

You've never seen one? "Gigantic Jets are rare," explains atmospheric scientist and Jet-expert Oscar van der Velde of the Université Paul Sabatier's Laboratoire d’Aérologie in Toulouse, France. "The first one was discovered in 2001 by Dr. Victor Pasko in Puerto Rico. Since then fewer than 30 jets have been recorded--mostly over open ocean and on only two occasions over land."

That's why researchers are excited by the events of Aug. 20th. On that night, amateur astronomer Richard Smedley of Broken Arrow, Oklahoma, was hunting for meteors using a low light video camera when instead he caught two Gigantic Jets:


Click on the image to view the 4.5 MB video

"They were much brighter than a typical meteor--more like a fireball," says Smedley. To appreciate the size of these things, consider the following: "They came from a thunderstorm more than 100 miles away in Missouri: map." This means the Jets were about 48 miles tall measured upward from the top of the thundercloud.

Because they connect thunderstorms directly to the ionosphere, Gigantic Jets play some role in the global flow of electricity around our planet, but how big is that role? "No one knows," says van der Velde. "This is cutting-edge research and these photos from Oklahoma provide an exciting new case-study."

Amateur astronomers, you can contribute to this research. Check your local weather radar map for storms just over the horizon, point your meteor cameras in that direction, and click. Gigantic Jets may not be as rare as we think.

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 August 24, 2007 there were 878 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.
©2013 Spaceweather.com. All rights reserved.