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Solar wind
speed: 385.3 km/sec
density: 4.9 protons/cm3
explanation | more data
Updated: Today at 2350 UT
X-ray Solar Flares
6-hr max: C3
2208 UT Feb18
24-hr: C3
2208 UT Feb18
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 18 Feb 15
The magnetic field of sunspot AR2282 has decayed. It no longer poses a threat for significant solar flares. Credit: SDO/HMI

Sunspot number: 40
What is the sunspot number?
Updated 18 Feb 2015

Spotless Days
Current Stretch: 0 days
2015 total: 0 days (0%)

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 18 Feb 2015

The Radio Sun
10.7 cm flux: 119 sfu
explanation | more data
Updated 18 Feb 2015

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 5
explanation | more data
Interplanetary Mag. Field
Btotal: 5.5 nT
Bz: 4 nT south
explanation | more data
Updated: Today at 2028 UT
Coronal Holes: 18 Feb 15
A Solar wind flowing from these polar coronal holes should reach Earth on Feb. 21-22. Credit: SDO/AIA.
Noctilucent Clouds As of Nov. 22, 2014, the season for southern hemisphere noctilucent clouds is underway. The south polar "daisy" pictured below is a composite of near-realtime images from NASA's AIM spacecraft.
Switch view: Ross Ice Shelf, Antarctic Penninsula, East Antarctica, Polar
Updated at: 02-17-2015 18:55:02
NOAA Forecasts
Updated at: 2015 Feb 18 2200 UTC
0-24 hr
24-48 hr
01 %
01 %
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: 2015 Feb 18 2200 UTC
0-24 hr
24-48 hr
15 %
05 %
01 %
01 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
15 %
25 %
15 %
20 %
05 %
Wednesday, Feb. 18, 2015
What's up in space

Learn to photograph Northern Lights like a pro. Sign up for Peter Rosen's Aurora Photo Courses in Abisko National Park.

Lapland tours

THE SUN IS FLATLINING: For the 6th day in a row, solar activity remains very low. No sunspots are flaring, and the sun's X-ray output has flatlined. NOAA forecasters estimate a scant 1% chance of significant solar flares on Feb. 18th. Solar flare alerts: text, voice

GEOMAGNETIC STORM: Earth is entering a solar wind stream, and this is sparking G1-class geomagnetic storms around the Arctic Circle. During the late hours of Feb. 17th, an outburst over Björkliden, Sweden, turned the whole landscape green:

"I was in Björkliden just coming back down from a mountain hut via snowmobile when I saw that a strong aurora was building," says photographer Oliver Wright. "I jumped off among the snowy trees and took a quick picture. This is only a 1.6 second exposure!"

NOAA forecasters estimate a 40% chance of geomagnetic storms on Feb. 18th as the solar wind continues to blow. Aurora alerts: text, voice

Realtime Aurora Photo Gallery

VENUS AND MARS: When the sun goes down tonight, step outside and face west. Venus is beaming through the twilight, so bright that it is often mistaken for a landing plane. Wait a while as the sky grows darker. Fainter Mars pops out right beside Venus. Didier Van Hellemont photographed the pair at sunset on Feb. 17th over Sint-Laureins, Belgium:

In only a few days, the two planets will be dramatically closer together. At closest approach on Feb. 21st, they will be only 0.4o apart, less than the width of a full Moon. The night before closest approach might be best of all: On Feb. 20th, the crescent Moon will pass right by the converging planets. Mark both dates on your calendar, Feb. 20th and 21st, and watch the western sky at sunset. It's a great way to end the day.

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 Feb. 18, 2015, the network reported 25 fireballs.
(25 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 18, 2015 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2015 CK13
Feb 15
7.2 LD
16 m
2015 CS
Feb 15
3.4 LD
22 m
2015 AZ43
Feb 15
7.7 LD
87 m
2015 CJ13
Feb 15
8.5 LD
66 m
2015 CL13
Feb 15
2 LD
32 m
2015 CQ13
Feb 18
6.7 LD
31 m
2015 CA40
Feb 23
6.3 LD
49 m
2000 EE14
Feb 27
72.5 LD
1.6 km
2063 Bacchus
Apr 7
76 LD
1.6 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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