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Solar wind
speed: 420.6 km/sec
density: 1.9 protons/cm3
explanation | more data
Updated: Today at 2346 UT
X-ray Solar Flares
6-hr max: C1
2021 UT Apr04
24-hr: C8
1348 UT Apr04
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 04 Apr 14
Sunspots AR2026 and AR2030 have 'beta-gamma' magnetic fields that harbor energy for M-class solar flares. Credit: SDO/HMI
Sunspot number: 137
What is the sunspot number?
Updated 04 Apr 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%)

04 Apr 2014

The Radio Sun
10.7 cm flux: 153 sfu
explanation | more data
Updated 04 Apr 2014

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 2
explanation | more data
Interplanetary Mag. Field
Btotal: 3.3 nT
Bz: 0.3 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 04 Apr 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 Apr 04 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 Apr 04 2200 UTC
0-24 hr
24-48 hr
35 %
10 %
25 %
01 %
05 %
01 %
High latitudes
0-24 hr
24-48 hr
10 %
15 %
30 %
25 %
55 %
20 %
Friday, Apr. 4, 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

INCOMING CMEs: A pair of CMEs that left the sun on April 1st and 2nd have probably merged and will deliver a combined glancing blow to Earth's magnetic field late on April 4th. NOAA forecasters estimate a 50% chance of geomagnetic storms in reponse to the impact. High-latitude sky watchers should Aurora alerts: text, voice

THREE EXPLOSIONS: Yesterday, during the late hours of April 3rd, three active regions on the sun exploded in quick succession. Play the movie, then consider the question: Was that three explosions, or just one? (continued below)

Visually, the rapid-fire explosions appear to be causally linked, and indeed they might have been. Since 2010, when SDO was launched, solar physicists have increasingly appreciated the interconnectedness of explosions on the sun. SDO's full-disk view has shown that magnetic instabilities can hop from one sunspot to another, propagating hundreds of thousands of kilometers to cause chain reactions on a titanic scale. The Global Eruption of August 2010 is the iconic example.

When eruptions are as big as this, it's hard for Earth to stay out of the line of fire. Watch the movie again. Material hurled away from the rightmost blast site could form the basis of a CME that reaches Earth in a few days. Stay tuned for updates about this possibility. Solar flare alerts: text, voice

Realtime Space Weather Photo Gallery

DAYLIGHT REQUIRED: In the night sky, there are thousands of stars visible to the unaided eye, and thousands of times more stars in range of backyard optics. Not a single one of those faraway balls of fire, however, looks any bigger than a pinprick. For a better view of a star, you need some daylight:

This star is the sun. Francois Rouviere of Mougins, France, took the picture on March 31st using no more than a 7-inch refracting telescope and an "H-alpha" filter tuned to the red glow of solar hydrogen.

"I caught this impressive explosion at the sun's western limb near sunspot AR2014," says Rouviere. "The inset, which is at a wavelength 1 Å shorter than H-alpha, shows fast moving material blue-shifted by the Doppler effect."

Got a solar telescope? NOAA forecasters estimate a 40% chance of M-class flares and a 5% chance of X-flares on April 4th. Train those optics on the daylight sky. Solar flare alerts: text, voice

Note: Always use safe solar filters when observing the sun. Unfiltered sunlight, focused by optics, can cause serious eye damage.

Realtime Mars Photo Gallery

Realtime Comet Photo Gallery

Realtime Aurora 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 Apr. 2, 2014, the network reported 9 fireballs.
(9 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 April 4, 2014 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
1995 SA
Apr 2
73.1 LD
1.6 km
2000 HD24
Apr 4
42.2 LD
1.3 km
2014 GN1
Apr 6
2.4 LD
52 m
2007 TV18
Apr 18
7.4 LD
88 m
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
2002 JC
May 24
48.7 LD
1.4 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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