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Solar wind
speed: 324.4 km/sec
density: 6.8 protons/cm3
explanation | more data
Updated: Today at 2352 UT
X-ray Solar Flares
6-hr max: B4
1834 UT Feb27
24-hr: B9
0954 UT Feb27
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 27 Feb 15
None of these sunspots poses a threat for strong flares. Solar activity remains low. Credit: SDO/HMI

Sunspot number: 39
What is the sunspot number?
Updated 27 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 27 Feb 2015

The Radio Sun
10.7 cm flux: 111 sfu
explanation | more data
Updated 27 Feb 2015

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 1
explanation | more data
Interplanetary Mag. Field
Btotal: 3.7 nT
Bz: 2.2 nT south
explanation | more data
Updated: Today at 2352 UT
Coronal Holes: 27 Feb 15
A Solar wind flowing from this southern coronal hole should reach Earth on Feb. 28-March 1. 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: 02-26-2015 20:55:02
NOAA Forecasts
Updated at: 2015 Feb 27 2200 UTC
0-24 hr
24-48 hr
10 %
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: 2015 Feb 27 2200 UTC
0-24 hr
24-48 hr
40 %
40 %
25 %
25 %
05 %
05 %
High latitudes
0-24 hr
24-48 hr
10 %
10 %
25 %
25 %
60 %
60 %
Friday, Feb. 27, 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

SOLAR SECTOR BOUNDARY CROSSING: High-latitude auroras are possible on Feb 28th when Earth crosses through a fold in the heliospheric current sheet. This is called a "solar sector boundary crossing," and NOAA forecasters estimate a 60% chance of polar geomagnetic storms when it occurs. Aurora alerts: text, voice

Boosting the chances of auroras even more is a high-speed solar wind stream waiting on the other side of the heliospheric current sheet. The wind is flowing from a coronal hole on the sun, shown in this extreme UV image from NASA's Solar Dynamics Observatory:

Coronal holes are places in the sun's atmosphere where the sun's magnetic field opens up, allowing hot gas to escape. In the image, above, the magnetic field is traced by curved white lines. Arrows show where the solar wind is escaping along open field lines. Forecasters espect the gassy stream to reach Earth on Feb. 28-March 1. Keep an eye on the realtime photo gallery for aurora sightings this weekend.

Realtime Aurora Photo Gallery

WHAT ARE THE ODDS? On Feb.19th, and the students of Earth to Sky Calculus launched a helium balloon to the stratosphere. The payload, a cosmic radiation buoy, traveled 112,300 feet above Earth's surface and drifted more than 85 linear miles from the launch site. When it parachuted back to Earth, it landed in a sparsely vegetated stretch of Nevada desert. Getting caught in a tree would seem unlikely, yet that's exactly what happened:

The payload descended into a beautiful forest of Joshua trees, and one of them snagged the parachute. As the student recovery team learned, disentangling the cords of a parachute from the spikey embrace of a Joshua tree is no easy trick. Nevertheless, they persisted and won back their radiation buoy.

The students have been flying radiation buoys to the stratosphere since 2013. Their purpose is to monitor the effect of cosmic rays and solar activity on the upper atmosphere. This buoy carried a pair of ionizing radiation detectors, sensitive to X-rays, gamma-rays and beta particles in the energy range 10 keV to 20 MeV.

A preliminary look at the Feb. 19th data reveals some of the highest radiation levels recorded in the 2-year history of the program. This could be a result of the current spate of low solar activity. Cosmic rays are repelled by CMEs and strong solar magnetic fields. When the sun is quiet, cosmic rays penetrate the solar system in greater numbers--an effect which the students are monitoring with their balloon flights.

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. 27, 2015, the network reported 1 fireballs.
(1 sporadic)

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 27, 2015 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2015 DU
Feb 23
8 LD
20 m
2015 CA40
Feb 23
6.3 LD
51 m
2000 EE14
Feb 27
72.5 LD
1.6 km
2015 DY198
Mar 1
2.2 LD
25 m
2015 DS53
Mar 2
3.1 LD
63 m
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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