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Solar wind
speed: 439.1 km/sec
density: 4.0 protons/cm3
explanation | more data
Updated: Today at 2346 UT
X-ray Solar Flares
6-hr max: B5
1701 UT Aug27
24-hr: B7
0835 UT Aug27
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 27 Aug 13
None of these sunspots poses a threat for strong solar flares. Credit: SDO/HMI
Sunspot number: 35
What is the sunspot number?
Updated 27 Aug 2013

Spotless Days
Current Stretch: 0 days
2013 total: 0 days (0%)
2012 total: 0 days (0%)
2011 total: 2 days (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Since 2004: 821 days
Typical Solar Min: 486 days

Update
27 Aug 2013

The Radio Sun
10.7 cm flux: 113 sfu
explanation | more data
Updated 27 Aug 2013

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 5 storm
24-hr max: Kp= 5
storm
explanation | more data
Interplanetary Mag. Field
Btotal: 8.0 nT
Bz: 4.8 nT south
explanation | more data
Updated: Today at 2346 UT
Coronal Holes: 27 Aug 13
Solar wind flowing from the indicated coronal hole should reach Earth on Aug. 30-31. Credit: SDO/AIA.

Spaceweather.com is now posting daily satellite images of noctilucent clouds (NLCs), which hover over Earth's poles at the edge of space. The data come from NASA's AIM spacecraft. The north polar "daisy" pictured below is a composite of near-realtime images from AIM assembled by researchers at the University of Colorado's Laboratory for Atmospheric and Space Physics (LASP).
Noctilucent Clouds
Switch view: Europe, USA, Asia, Polar
Updated at: 08-27-2013 12:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2013 Aug 27 2300 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: 2013 Aug 27 2300 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
25 %
25 %
SEVERE
20 %
20 %
 
Tuesday, Aug. 27, 2013
What's up in space
 

They came from outer space--and you can have one! Genuine meteorites are now on sale in the Space Weather Store.

 
Own your own meteorite

AURORA WATCH: The interplanetary magnetic field (IMF) inside the solar wind is tilting south on August 27th. This condition often sets the stage for polar geomagnetic storms. High-latitude sky watchers should be alert for auroras after nightfall. Aurora alerts: text, voice.

NORTHERN CORONAL HOLE: Magnetic fields in the sun's northern hemisphere have opened up, creating a hole in the sun's upper atmosphere. This August 27th image from NASA's Solar Dynamics Observatory shows how solar wind is streaming out of the coronal hole:

The solar wind stream is heading for Earth, due to arrive on August 30-31. Its impact will not be a major event. Nevertheless, it could spark minor geomagnetic storms and auroras at high latitudes. This is good news around the Arctic Circle where the midnight sun is setting. Darkening skies will allow auroras to be seen for the first time in months. Browse the aurora gallery for a preview.

Realtime Aurora Photo Gallery

THE COLORS INSIDE A LIGHTNING BOLT: To the human eye, a nearby flash of lightning looks blindingly white. But have you ever wondered what colors might emerge if the flash were spread out chromatically, like a rainbow? During a recent thunderstorm in Tarn, France, David Antao decided to find out. "I am an enthusiastic astro-spectroscopist," he says, "so I couldn't resist shooting some spectra." Here is the result:

"I found it really beautiful!" says Antao.

All of the colors of a rainbow are present in the lightning strike, but some colors are stronger than others. Red, green and blue emission lines zig-zag across the spectrum tracing the shape of the original bolt. These colors are mainly due to the recombination of electrons with nitrogen molecules broken apart and ionized by the searing heat of the lightning discharge. Lines from oxygen, hydrogen, and nitrogen oxides are present, too.

"By analysing this spectra, it is possible to determine the temprature of the lightning," notes Antao. "I am trying to do this now."

Realtime Space Weather Photo Gallery


Realtime Noctilucent Cloud Photo Gallery
[previous years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011]


Realtime Comet Photo Gallery

  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 27, 2013 there were 1421 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
1999 CF9
Aug 23
24.7 LD
1.1 km
2013 QR1
Aug 25
8.2 LD
215 m
2002 JR9
Aug 31
63.5 LD
1.4 km
2000 DK79
Nov 10
49.1 LD
3.2 km
2011 JY1
Nov 13
8.2 LD
57 m
2001 AV43
Nov 18
2.9 LD
58 m
2010 CL19
Nov 25
37.6 LD
1.3 km
2013 NJ
Nov 26
2.5 LD
180 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 web 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 Dynamics Observatory
  Researchers call it a "Hubble for the sun." SDO is the most advanced solar observatory ever.
STEREO
  3D views of the sun from NASA's Solar and Terrestrial Relations Observatory
Solar and Heliospheric Observatory
  Realtime and archival images of the Sun from SOHO.
Daily Sunspot Summaries
  from the NOAA Space Environment Center
Heliophysics
  the underlying science of space weather
Space Weather Alerts
   
  more links...
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