You are viewing the page for Aug. 19, 2012
  Select another date:
<<back forward>>
SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 605.7 km/sec
density: 1.8 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B5
2251 UT Aug19
24-hr: C2
0544 UT Aug19
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 18 Aug 12
None of the sunspots on the Earthside of the sun pose a threat for strong flares, but a potent farside active region is approaching from just behind the NE limb. Credit: SDO/HMI
Sunspot number: 56
What is the sunspot number?
Updated 18 Aug 2012

Spotless Days
Current Stretch: 0 days
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 18 Aug 2012


The Radio Sun
10.7 cm flux: 98 sfu
explanation | more data
Updated 18 Aug 2012

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 5.2 nT
Bz: 3.4 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 17 Aug 12
A solar wind stream flowing from the indicated coronal hole should reach Earth on ~Aug. 20. Credit: SDO/AIA.
SPACE WEATHER
NOAA Forecasts
Updated at: 2012 Aug 19 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
20 %
20 %
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: 2012 Aug 19 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
10 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
15 %
MINOR
30 %
20 %
SEVERE
25 %
15 %
 
Sunday, Aug. 19, 2012
What's up in space
 

Hang the Transit of Venus on your wall! Hubble-quality images from NASA's Solar Dynamics Observatory are now available as metallic posters in the Space Weather Store.

 
Venus Transit metal posters

SIGNIFICANT SOLAR FLARE, NOT EARTH-DIRECTED: A magnetic filament snaking over the sun's northeastern limb erupted on August 18th (01:02 UT), producing a significant M5.5-class solar flare. Click to view a movie of the eruption recorded by NASA's Solar Dynamics Observatory:

A coronal mass ejection (CME) flew away from the blast site, but the cloud is not heading for Earth. This eruption was not geoeffective.

The magnetic filament reformed, post-eruption, and appears to be connected to an active sunspot group on the farside of the sun. Although the sunspot is hidden behind the limb, the Solar Dynamics Observatory can see the sunspot's towering magnetic canopy flashing and hurling plasma over the edge of the sun. Click on the image to set the scene in motion:

A great way to see the hidden sunspot is using NASA's 3D Sun app, which shows our star as a 3-dimensional globe that you can spin and inspect from any angle. Data for the app come from a fleet of three spacecraft (SDO + STEREO) that surround the sun. Download the app and look around the globe for a hot spot labeled 'farside AR.' (AR="active region")

Soon, the sun's rotation will turn the sunspot from the farside to the Earthside of the sun. A significant uptick in geoeffective solar activity is possible in the days ahead. Solar flare alerts: text, phone.

Realtime Space Weather Photo Gallery

RETURN OF THE ARCTIC AURORAS: It has been a while since sky watchers around the Arctic Circle have enjoyed the Northern Lights. Auroras are hard to see through the glare of the midnight sun. As summer comes to an end, however, aurora season is beginning again. On August 16th, B.Art Braafhart spotted a splash of green over Salla in the Finnish Lapland:

"Finally, after three nights hunting for 'the green lights,' I made the first catch of the new season," says Braafhart. "The nice temperature (+12C) was accompanied by zooming mosquitos around midnight. The apparition was brief, the colors thin and light, but after an absence of 4 months exciting again!" Aurora alerts: text, phone.

Realtime Aurora Photo Gallery


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

  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 19, 2012 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Mag.
Size
37655 Illapa
Aug 12
37 LD
--
1.2 km
2012 PZ17
Aug 12
3 LD
--
20 m
2012 PD20
Aug 18
9.7 LD
--
37 m
2000 ET70
Aug 21
58.5 LD
--
1.1 km
1998 TU3
Aug 25
49.2 LD
--
4.9 km
2009 AV
Aug 26
62.8 LD
--
1.0 km
1998 UO1
Oct 4
60.1 LD
--
2.1 km
2005 GQ21
Oct 12
77 LD
--
1.0 km
1998 ST49
Oct 18
28.7 LD
--
1.3 km
1991 VE
Oct 26
34 LD
--
1.1 km
2001 CV26
Oct 30
68 LD
--
2.4 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.
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
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.