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Solar wind
speed: 339.3 km/sec
density: 4.3 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: C4
2252 UT Mar18
24-hr: C4
2252 UT Mar18
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 18 Mar 14
None of these sunspots is strongly flaring. Solar activity is low. Credit: SDO/HMI
Sunspot number: 110
What is the sunspot number?
Updated 18 Mar 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%)

18 Mar 2014

The Radio Sun
10.7 cm flux: 136 sfu
explanation | more data
Updated 18 Mar 2014

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 2
explanation | more data
Interplanetary Mag. Field
Btotal: 5.6 nT
Bz: 4.5 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 18 Mar 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: 02-28-2014 16:55:02
NOAA Forecasts
Updated at: 2014 Mar 18 2200 UTC
0-24 hr
24-48 hr
40 %
40 %
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 Mar 18 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 %
Tuesday, Mar. 18, 2014
What's up in space

When is the best time to see auroras? Where is the best place to go? And how do you photograph them? These questions and more are answered in a new book, Northern Lights - a Guide, by Pal Brekke & Fredrik Broms.

Northern Lights - a Guide

QUIET SUN: Despite a relatively high sunspot number, solar activity is low. None of the half-dozen sunspot groups on the solar disk is actively flaring. NOAA forecasters estimate a 35% chance of M-class flares and a 5% chance of X-flares on March 18th. Solar flare alerts: text, voice

APPROACHING MARS: Count slowly: one one-thousand, two one-thousand, three one-thousand.... You're now 30 km closer to the planet Mars. Earth and Mars are converging for a close encounter in April 2014, an event astronomers call "opposition." At closest approach on April 14th, burnt-orange Mars will rise in the east at sunset and soar almost overhead at midnight shining 8 times brighter than a 1st magnitude star. Even now the view is impressive:

Romanian astrophotographer Maximilian Teodorescu took the picture on March 14th using an 11-inch Celestron telescope. "The Red Planet has a lot to offer," he says. "With the opposition getting closer every day, details are becoming more easily discernible." Teodorescu's images show a bank of icy clouds covering Hellas Basin, the widest and deepest impact crater on Mars. Also visible is the North Polar Cap, which is rapidly evaporating as summer unfolds in Mars' northern hemisphere.

Ready to see Mars for yourself? Tonight, March 18-19, the waning full Moon will pass by Mars in the constellation Virgo, making the Red Planet easy to locate. Point your optics at the bright burnt-orange "star" a few degrees above the lunar disk. Update: You're now about 600 km closer to Mars.

Realtime Mars Photo Gallery

SPACE WEATHER BALLOON--DOUBLE LAUNCH: On March 16th, the students of Earth to Sky Calculus launched a pair of research balloons into the stratosphere. One of the balloons carried an experimental Space Weather payload designed for rapid deployment during unexpected solar storms. Here it is, photographed in flight by the companion balloon:

The two balloons were about 10,000 feet above sea level when the photo was taken. One balloon photographing another in flight is a rare and possibly unique occurrence in the growing field of high-altitude ballooning. Congratulations to the students for breaking new ground in the air.

There was no solar storm yesterday. The test flight of the Rapid Response Space Weather Payload prepares the team for another day when a strong flare or geomagnetic storm takes forecasters by surprise. This fast-turnaround payload can be dispatched on a moment's notice to probe the stratosphere while the storm is underway. It includes a high-energy radiation sensor, a cryogenic thermometer, a GPS altimeter and other devices. Stay tuned for more data and images from the flight.

Realtime Space Weather Photo Gallery

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 Mar. 17, 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 March 18, 2014 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2014 EP12
Mar 14
2.9 LD
33 m
2014 EB25
Mar 14
2.7 LD
16 m
2014 DU22
Mar 14
7.9 LD
60 m
2014 EM
Mar 15
4.3 LD
36 m
2014 EY24
Mar 18
8.5 LD
70 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
2010 JO33
May 17
4 LD
43 m
2005 UK1
May 20
36.7 LD
1.1 km
1997 WS22
May 21
47.1 LD
1.5 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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