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Solar wind
speed: 339.4 km/sec
density: 5.0 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B4
1809 UT Oct11
24-hr: B6
0345 UT Oct11
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 11 Oct 14
Sunspot AR2182 has a 'beta-gamma' magnetic field that harbors energy for M-class solar flares. However, the sunspot is quiet and does not seem inclined to erupt. Credit: SDO/HMI
Sunspot number: 54
What is the sunspot number?
Updated 11 Oct 2014

Spotless Days
Current Stretch: 0 days
2014 total: 1 day (<1%)
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%)

Update 11 Oct

The Radio Sun
10.7 cm flux: 121 sfu
explanation | more data
Updated 11 Oct 2014

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 3
explanation | more data
Interplanetary Mag. Field
Btotal: 4.3 nT
Bz: 3.4 nT north
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 11 Oct 14
There are no large coronal holes on the Earthside of the sun. Credit: SDO/AIA. posts 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: 09-02-2014 12:55:12
NOAA Forecasts
Updated at: 2014 Oct 11 2200 UTC
0-24 hr
24-48 hr
15 %
10 %
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: 2014 Oct 11 2200 UTC
0-24 hr
24-48 hr
05 %
05 %
01 %
01 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
15 %
15 %
15 %
05 %
05 %
Saturday, Oct. 11, 2014
What's up in space

On October 23rd there will be a partial eclipse of the Sun. Got clouds? No problem. The event will be broadcast live on the web by the Coca-Cola Science Center.

Solar Eclipse Live

WANING CHANCE OF FLARES: There are only two sunspots visible on the solar disk, and both of them appear to be in a state of decay. NOAA forecasters estimate a waning 20% chance of M-flares and only a 1% chance of X-flares this weekend. Solar flare alerts: text, voice

ERUPTION MISSES EARTH: A magnetic filament near the sun's southwestern limb collapsed during the late hours of Oct. 10th. Part of the filament fell to the surface of the sun and released a C3-category burst of X-rays when it hit; this is called a "Hyder flare." NASA's Solar Dynamics Observatory recorded the eruption:

Not all of the filament fell to the solar surface. Some of it flew into space, forming the core of a massive CME. NOAA analysts have looked at the trajectory of the CME and they have decided it is not geoeffective. The storm cloud is going to miss Earth. Solar flare alerts: text, voice

Realtime Space Weather Photo Gallery

FALL COLORS: In most places, the colors of autumn are golden yellow and red, the palette of trees preparing for winter. In Norway, the colors of autumn are different: green and white--that is, auroras over ice. Bernt Olsen photographed them both on Oct. 11th:

"High up in the Norwegian mountains, at Goulasjavri, close to the Finnish border, the auroras were visible through bright moonlight," says Olsen. "I was able to take the picture despite a cold freezing wind."

Arctic sky watchers should be alert for more fall colors tonight. On Oct. 11-12, Earth will pass through a fold in the heliospheric current sheet. This is called a "solar sector boundary crossing," and NOAA forecasters estimate a 25% chance of polar geomagnetic storms when it occurs. Aurora alerts: text, voice

Realtime Aurora Photo Gallery

LUNAR ECLIPSE RECORDED BY SOLAR ARRAY: During a lunar eclipse, the normally-bright full Moon darkens as it passes through the shadow of Earth. Millions of sky watchers witnessed this beautiful dimming on Oct. 8th. David Boatwright of Californiia experienced the eclipse in a different way. His solar array browned out:

"My home has a 4.5 kW photovoltaic solar system on its roof," he explains. "During the day it produces a good amount of electricity. It even produces a couple of volts from ambient light at night. A full Moon will increase it to nearly 4 volts DC when overhead."

"Pictured above is a screen shot of the power output from my system. As you can see, it recorded the lunar eclipse. The voltage was cut in half during totality. From 3:30am to 4:30am PDT, the DC voltage dropped from 4 volts to 2 volts and then back up to 3 volts at the conclusion of the eclipse. I believe the 1 volt difference, before vs. after the eclipse, is due to the Moon being lower in the sky when the eclipse ended."

"By the way, I was watching the eclipse in my backyard as this voltage drop was occurring," he says.

Realtime Eclipse Photo Gallery

Realtime Space Weather Photo Gallery

Realtime Comet Photo Gallery

  All Sky Fireball Network

Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on

On Oct. 11, 2014, the network reported 50 fireballs.
(49 sporadics, 1 Daytime Sextantid)

In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]

  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 October 11, 2014 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2014 SB145
Oct 6
4.4 LD
23 m
2001 EA16
Oct 7
35.5 LD
1.9 km
2011 TB4
Oct 9
4.9 LD
34 m
2014 TR
Oct 11
9.9 LD
15 m
2010 FV9
Oct 11
8.7 LD
36 m
2014 TV
Oct 18
4.5 LD
61 m
2014 SC324
Oct 24
1.5 LD
62 m
2003 UC20
Oct 31
52.4 LD
1.0 km
2004 JN13
Nov 18
52.4 LD
4.1 km
1998 SS49
Nov 18
73.9 LD
3.2 km
2005 UH3
Nov 22
44.4 LD
1.3 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
Space Weather Alerts
  more links...
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