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Solar wind
speed: 443.9 km/sec
density: 1.3 protons/cm3
explanation | more data
Updated: Today at 2346 UT
X-ray Solar Flares
6-hr max: C1
2300 UT Feb23
24-hr: M1
0611 UT Feb23
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 23 Feb 14
Earth-facing sunspot complex AR1981-AR1982 has a 'beta-gamma' magnetic field that harbors energy for M-class solar flares. Credit: SDO/HMI
Sunspot number: 179
What is the sunspot number?
Updated 23 Feb 2014

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

22 Feb 2014

The Radio Sun
10.7 cm flux: 163 sfu
explanation | more data
Updated 23 Feb 2014

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Planetary K-index
Now: Kp= 4 unsettled
24-hr max: Kp= 4
explanation | more data
Interplanetary Mag. Field
Btotal: 8.0 nT
Bz: 5.3 nT north
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 23 Feb 14
A narrow stream of solar wind flowing from this equatorial coronal hole should reach Earth on Feb. 28-March 1.. 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: 02-23-2014 11:55:02
NOAA Forecasts
Updated at: 2014 Feb 23 2200 UTC
0-24 hr
24-48 hr
50 %
50 %
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: 2014 Feb 23 2200 UTC
0-24 hr
24-48 hr
10 %
10 %
01 %
01 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
15 %
25 %
20 %
20 %
20 %
Sunday, Feb. 23, 2014
What's up in space

Listen to radar echoes from satellites and meteors, live on listener-supported Space Weather Radio.

Spaceweather Radio is on the air

CHANCE OF MINOR STORMS: NOAA forecasters estimate a 50% chance of minor geomagnetic storms on Sunday, Feb. 23rd, in response to glancing blows from one or two incoming CMEs. Arctic sky watchers should remain alert for auroras. Aurora alerts: text, voice

SPRAWLING SUNSPOT FACES EARTH: Occupying an expanse of solar terrain more than 280,000 km wide, sunspot complex AR1981-AR1982 is crossing the center of the solar disk, almost-directly facing Earth. This morning at the Langkawi National Observatory in Malaysia, astronomer Karzaman Ahmad photographed the behemoth:

Because it's so wide, the entire sunspot complex would not fit on the page. Click here to see the whole thing. Dozens of dark cores are present in Ahmad's image. The largest ones are about the size of Earth. Also note the fine granulation of the solar surface. Those are Texas-sized bubbles of plasma rising and falling around the sunspots like water boiling on top of a hot stove.

The magnetic canopy of AR1981-AR1982 harbors energy for significant eruptions. NOAA forecasters estimate a 50% chance of M-class flares and a 5% chance of X-class flares on Feb. 23rd. Solar flare alerts: text, voice

Realtime Space Weather Photo Gallery

MYSTERY CLOUD (DE-MYSTIFIED): On the night of Feb. 20/21, photographer Dennis Mammana was stationed on Pedro Dome near Fairbanks, Alaska, in hopes of recording the Northern Lights. "I caught this instead—a tiny and bright cloud that rose from the western sky and spread slightly and faded over an hour or so," says Mammana. Here is a composite of two of his shots:

The cloud resembles a rocket fuel dump. Scientists from the University of Alaska frequently launch rockets from the nearby Poker Flat Research Range to study auroras. But on this night there were no rocket launches on Poker Flat.

Update: There was, however, a launch thousands of miles away. A Delta 4 rocket blasted off from Cape Canaveral carrying a GPS satellite.

Veteran satellite watcher Marco Langbroek of the Netherlands says this is it: "The mystery object on the Mammana photo is a fuel vent from the Feb 20 launch of GPS 2F-05 (USA 248, 20114-008A, #39533)."

"Although the satellite is in an orbit with a 54.98 degree inclination, that does not mean it was not visible from Mammana's location at 65N," he continues. "It is in a very high orbit and was at an altitude of over 20,000 km at the time of the photo. At such an altitude it is visible from 65 N, low in the west in this case."

A sky map prepared by Langbroek shows the position of the satellite (labeled "Object A") in the sky above Alaska when Mammana saw the cloud. The sky map and the photo are a good match.

Update #2: Another sighting of the cloud has been reported, by David Cartier, Sr. located 30 km. east of Whitehorse, Yukon, Canada. Click here to see his photo.

Realtime Aurora 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 Feb. 23, 2014, the network reported 4 fireballs.
(4 sporadics)

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]

On Feb. 22, 2014, the network reported 5 fireballs.
(5 sporadics)

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 February 23, 2014 there were 1458 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2000 EM26
Feb 18
8.8 LD
195 m
2014 BR57
Feb 20
4.4 LD
71 m
1995 CR
Feb 21
7.7 LD
215 m
2014 DH6
Feb 23
2 LD
30 m
2014 CR
Feb 24
8.3 LD
130 m
2000 EE14
Mar 6
64.6 LD
1.8 km
2014 CU13
Mar 11
8.1 LD
205 m
2003 QQ47
Mar 26
49.9 LD
1.4 km
1995 SA
Apr 2
73.1 LD
1.6 km
2000 HD24
Apr 4
42.2 LD
1.3 km
2007 HB15
Apr 28
6.7 LD
12 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.
  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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