You are viewing the page for Nov. 11, 2011
  Select another date:
<<back forward>> -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
Solar wind
speed: 380.7 km/sec
density: 0.7 protons/cm3
explanation | more data
Updated: Today at 2332 UT
X-ray Solar Flares
6-hr max: C5
1709 UT Nov11
24-hr: C5
1709 UT Nov11
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 11 Nov 11
The decay of sunspot 1339 is accelerating, but it still poses a threat for M-class solar flares. Credit: SDO/HMI
Sunspot number: 0
What is the sunspot number?
Updated 10 Nov 2011

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

Updated 10 Nov 2011

The Radio Sun
10.7 cm flux: 179 sfu
explanation | more data
Updated 10 Nov 2011

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 1
explanation | more data
Interplanetary Mag. Field
Btotal: 4.2 nT
Bz: 2.7 nT north
explanation | more data
Updated: Today at 2333 UT
Coronal Holes: 11 Nov 11
There are no large coronal holes on the Earthside of the sun. Credit: SDO/AIA.
NOAA Forecasts
Updated at: 2011 Nov 11 2200 UTC
0-24 hr
24-48 hr
40 %
40 %
05 %
05 %
Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: active, minor storm, severe storm
Updated at: 2011 Nov 11 2200 UTC
0-24 hr
24-48 hr
25 %
20 %
15 %
10 %
05 %
01 %
High latitudes
0-24 hr
24-48 hr
40 %
30 %
25 %
15 %
10 %
05 %
Friday, Nov. 11, 2011
What's up in space

Turn your cell phone into a field-tested satellite tracker. Works for Android and iPhone.

Satellite flybys

MYSTERY OF THE LUNAR IONOSPHERE: How can a world without air have an ionosphere? Somehow the Moon has done it. Lunar researchers have been struggling with this mystery for years, and they may have finally found a solution. [video]

INCOMING CME: A CME is heading for Earth. It left the sun on Nov. 9th when a magnetic filament in the vicinity of sunspot complex 1342-1343 erupted. The M1-class explosion hurled a bright cloud of plasma into space, shown here in a movie from the Solar and Heliospheric Observatory (SOHO) :

Although the eruption was not squarely aimed at Earth, the CME is likely to deliver a glancing blow to our planet's magnetic field on Nov. 11th or 12th. NOAA forecasters estimate a 25% chance of high-latitude geomagnetic storms. Aurora alerts: text, voice.

SKY COLORS: Auroras in Nebraska are rare, but who needs auroras when you've got iridescence? University of Nebraska freshman Evan Ludes took this picture of cloud-colors over Omaha on the morning of Nov. 10th:

"I walked out of class this morning and was greeted by one of the best iridescence displays I've ever seen!" says Ludes. "The colors formed on the leading edge of a long stretch of cirrocumulus clouds."

Iridescent colors appear when sunlight shines through water droplets in the edges of clouds. The mechanism is diffraction. The colors are at their brightest and most distinct when the droplets are small and uniformly-sized.

"I'm no optics expert," says Ludes, "but I'm guessing the colors were particularly vivid since these clouds were newly formed and therefore likely had water droplets of similar shape and size. It was incredible how distinct the bands of colors were even when zoomed in at 300mm!"

  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 November 11, 2011 there were 1256 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2011 FZ2
Nov 7
75.9 LD
1.6 km
2005 YU55
Nov 8
0.8 LD
400 m
2011 UT91
Nov 15
9.9 LD
109 m
1994 CK1
Nov 16
68.8 LD
1.5 km
1996 FG3
Nov 23
39.5 LD
1.1 km
2003 WM7
Dec 9
47.6 LD
1.6 km
1999 XP35
Dec 20
77.5 LD
1.0 km
2000 YA
Dec 26
2.9 LD
80 m
2011 SL102
Dec 28
75.9 LD
1.1 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 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.
  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
  the underlying science of space weather
Science Central
Trade Show Displays
  more links...
©2010 All rights reserved. This site is penned daily by Dr. Tony Phillips.
©2013 All rights reserved.