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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: 365.2 km/sec
density: 6.4 protons/cm3
explanation | more data
Updated: Today at 2345 UT
X-ray Solar Flares
6-hr max: B2
2300 UT Feb22
24-hr: B2
2300 UT Feb22
explanation | more data
Updated: Today at: 2340 UT
Daily Sun: 22 Feb. 10
Quiet sunspot 1049 poses no threat for strong solar flares. Image credit: SOHO/MDI
Sunspot number: 17
What is the sunspot number?
Updated 21 Feb 2010

Spotless Days
Current Stretch: 0 days
2010 total: 2 days (4%)
2009 total: 260 days (71%)
Since 2004: 772 days
Typical Solar Min: 485 days
explanation | more info
Updated 21 Feb 2010


The Radio Sun
10.7 cm flux: 84 sfu
explanation | more data
Updated 21 Feb 2010

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 1
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 5.3 nT
Bz: 4.3 nT south
explanation | more data
Updated: Today at 2346 UT
Coronal Holes:
There are no large coronal holes on the Earth-facing side of the sun. Credit: SOHO Extreme UV Telescope
SPACE WEATHER
NOAA Forecasts
Updated at: 2010 Feb 22 2201 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: 2010 Feb 22 2201 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
05 %
05 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
What's up in Space
February 22, 2010

NEW AND IMPROVED: Turn your iPhone or iPod into a field-tested global satellite tracker. The Satellite Flybys app now works in all countries.

 

ENDEAVOUR HAS LANDED: Space shuttle Endeavour returned to Earth on Sunday night, concluding a two-week mission to tthe International Space Station (ISS): full story.

MAGNIFICENT MAGNETISM: NASA spacecraft and amateur astronomers alike are monitoring a staggeringly-long filament of magnetism on the sun. It stretches more than a million kilometers around the sun's southeastern limb:


Image credit: Solar and Heliospheric Observatory (SOHO)

As this movie shows, the filament has remained mostly stable for at least two days. However, similar filaments in the past have been known to collapse, and when they hit the surface of the sun--bang! A tremendous explosion called a "Hyder flare" results, sometimes rivaling the strongest flares produced by sunspots. Solar physicists have not yet learned to predict Hyder flares, so we cannot estimate the odds of one now. Readers with solar telescopes are encouraged to monitor developments.

more images: from C. Swiger and J. Stetson of South Portland, Maine; from Mark Townley of Brierley Hill, West Mids, UK; from Cai-Uso Wohler of Bispingen, Germany; from Alan Friedman of downtown Buffalo, NY; from Michael Wilk of Augsburg, Germany

AURORAL ROAR: Listen to this. The sounds you just heard came from the loudspeaker of a radio receiver tuned to 2.7 MHz during a display of Northern Lights. "We call it 'auroral roar'," says Prof. Jim Labelle of Dartmouth College. "It's a natural radio emission caused by a cyclotron resonance between auroral electrons and plasma waves in Earth's ionosphere."

On Feb. 16th, Labelle and colleagues launched a Black Brant XII sounding rocket from the Poker Flat Research Range in Alaska to study the process in action:

Dartmouth graduate student Micah Dombrowski took the picture. "We flew into some of the best auroras seen in years," he says.

The mission, named "CHARM II," short for Correlation of High-Frequencies and Auroral Roar Measurements, is a collaboration between Dartmouth College, the University of Iowa, and the French National Center for Scientific Research. It aims to decipher the mysteries of auroral roar and related phenomena "using the ionosphere as a natural laboratory for studying electron beam-plasma interactions," says Labelle.

"Preliminary inspection of the data says that the mission was a great success," adds Dombrowski. "Now I have a lot of data to reduce! Many thanks to the NASA NSROC, NEMS, and PFRR teams--and to Nature for such a great show!"

February Northern Lights Gallery
[previous Februarys: 2009, 2008, 2007, 2006, 2004, 2003, 2002]

 
       
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 February 22, 2010 there were 1103 potentially hazardous asteroids.
Feb. 2010 Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2009 UN3
Feb. 9
14.3 LD
12
1.2 km
2010 CK19
Feb. 17
0.9 LD
17
11 m
2001 FD58
Feb. 19
58.5 LD
17
0.9 km
2010 CJ18
Feb. 19
3.3 LD
18
20 m
2002 EZ11
Feb. 24
77.5 LD
18
1.0 km
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 Weather Prediction Center
  The official U.S. government space weather bureau
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.
STEREO
  3D views of the sun from NASA's Solar and Terrestrial Relations Observatory
Daily Sunspot Summaries
  from the NOAA Space Environment Center
Current Solar Images
  from the National Solar Data Analysis Center
Science Central
   
  more links...
   
©2008, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.

 

 

 

 

 

 

 

 

 

 

 

 

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