You are viewing the page for Jul. 20, 2011
  Select another date:
<<back forward>>
SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 671.3 km/sec
density: 2.1 protons/cm3
explanation | more data
Updated: Today at 2344 UT
X-ray Solar Flares
6-hr max: B5
1756 UT Jul20
24-hr: B8
1551 UT Jul20
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 20 Jul 11
Sunspot 1254 is growing rapidly and could soon pose a threat for C-class solar flares. Credit: SDO/HMI
Sunspot number: 96
What is the sunspot number?
Updated 19 Jul 2011

Spotless Days
Current Stretch: 0 days
2011 total: 1 day (<1%)
2010 total: 51 days (14%)
2009 total: 260 days (71%)
Since 2004: 820 days
Typical Solar Min: 486 days

Updated 19 Jul 2011


The Radio Sun
10.7 cm flux: 100 sfu
explanation | more data
Updated 19 Jul 2011

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 4 unsettled
24-hr max: Kp= 4
unsettled
explanation | more data
Interplanetary Mag. Field
Btotal: 3.9 nT
Bz: 2.4 nT south
explanation | more data
Updated: Today at 2344 UT
Coronal Holes: 19 Jul 11
Earth is entering a solar wind stream flowing from the indicated coronal hole. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2011 Jul 20 2200 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: 2011 Jul 20 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
40 %
40 %
MINOR
30 %
30 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
50 %
50 %
MINOR
40 %
40 %
SEVERE
10 %
05 %
 
Wednesday, Jul. 20, 2011
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

PLUTO'S NEW MOON: Astronomers using the Hubble Space Telescope have discovered a fourth moon orbiting Pluto. The new satellite popped up in a Hubble survey searching for rings around the dwarf planet. Science@NASA has the full story.

NOTE TO ASTRONAUTS: Be alert for auroras. As the hours wind down on the final mission of NASA's 30-year shuttle program, a solar wind stream is buffeting Earth's magnetic field, prompting NOAA forecasters to declare a 30% chance of high-latitude geomagnetic activity during the next 24 hours. Pausing to look out the window of Atlantis could be a rewarding experience.

SPACESHIPS IN THE SUN: Space shuttle Atlantis undocked and backed away from the International Space Station on July 19th at 4:18 am EDT. Less than an hour later, the two spacecraft flew directly in front of the sun over the Czech Republic in Europe:

Astrophotographer Thierry Legault traveled 1300 km from Paris to take the picture--the last double transit of the shuttle program. "The shuttle was poised to begin its flyaround of the ISS at the time of the transit," he says. Legault has taken pictures like this before, sometimes even better, but never quite so final. The shuttle will return to Earth permanently on Thursday, July 21st, at 5:57 am EDT. "Farewell, Atlantis!" says Legault.

more images: from Martin Gembec of Albrechtice, Czech Republic

HOT DINNER: Paleontologist and amateur astronomer Wienie van der Oord lives in the Arava desert in Israel, close to the Jordanian and Egyptian border. "A friend and I were hiking in the area before sunset on July 16th when I realized we hadn't eaten since breakfast," says van der Oord. It was time for a hot dinner:

"Anna tried to prevent me from burning my mouth as I took a bite out of the sun," continues van der Oord. "The meal was not as filling as I expected, so later I had the Moon for desert."

Other photographers are also finding the sun to be an appetizing target. Click on the links for more snapshots: from Tom of Derby, Western Australia; from Matthias Juergens of Gnevsdorf, Germany; from Peter Desypris of Island of Syros, Greece; from Michael Borman of Evansville, Indiana;


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


June 2011 Aurora Gallery
[Aurora alerts: text, voice] [previous Junes: 2010, 2008, 2001]

  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 20, 2011 there were 1237 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
2011 EZ78
Jul 10
37.3 LD
--
1.6 km
2003 YS117
Jul 14
73.9 LD
--
1.0 km
2007 DD
Jul 23
9.3 LD
--
31 m
2003 BK47
Jul 26
77.6 LD
--
1.1 km
2009 AV
Aug 22
49.7 LD
--
1.1 km
2003 QC10
Sep 18
50 LD
--
1.2 km
2004 SV55
Sep 19
67.5 LD
--
1.2 km
2007 TD
Sep 23
3.8 LD
--
58 m
2002 AG29
Oct 9
77.1 LD
--
1.0 km
2000 OJ8
Oct 13
49.8 LD
--
2.5 km
2009 TM8
Oct 17
1.1 LD
--
8 m
2011 FZ2
Nov 7
75.9 LD
--
1.6 km
2005 YU55
Nov 8
0.8 LD
--
175 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
Science Central
 
Conquest Graphics
  for out-of-this-world printing and graphics
Trade Show Displays
   
  more links...
©2010 Spaceweather.com. All rights reserved. This site is penned daily by Dr. Tony Phillips.
©2019 Spaceweather.com. All rights reserved.