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Solar wind
speed: 347.9 km/sec
density: 7.4 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B6
2048 UT Jun04
24-hr: C2
0136 UT Jun04
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 04 Jun 14
Sunspot AR2077 poses a slight threat for M-class solar flares. Otherwise all of the spots on the solar disk are stable and quiet. Credit: SDO/HMI
Sunspot number: 61
What is the sunspot number?
Updated 04 Jun2014

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 Jun 2014

The Radio Sun
10.7 cm flux: 107 sfu
explanation | more data
Updated 04 Jun 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: 3.8 nT
Bz: 2.2 nT south
explanation | more data
Updated: Today at 2347 UT
Coronal Holes: 04 Jun 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: 06-04-2014 11:55:05
NOAA Forecasts
Updated at: 2014 Jun 04 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: 2014 Jun 04 2200 UTC
0-24 hr
24-48 hr
05 %
10 %
01 %
01 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
20 %
15 %
25 %
05 %
15 %
Wednesday, Jun. 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

FATHER'S DAY AT THE EDGE OF SPACE: Would you like to send your dad to the Edge of Space? He can't go, but his picture can. Using a suborbital helium balloon, the students of Earth to Sky Calculus will fly the image of your choice to 120,000 ft and photograph it against the curved limb of the Earth. The returned photo (example) makes a great Father's Day gift. The flight fee is $49.95, and profits support student research. Contact Dr. Tony Phillips for details.

BROKEN HALO: It is well known that ice crystals in high clouds can catch the light of the sun, bending its rays to produce beautiful circular halos in the sky. Last month, Alan Clark of Calgary, Alberta, saw such a halo, but it was strangely broken:

"I saw this unusual halo on May 17th," says Clark. "It appears that a sharp transition between clouds of significantly different ice crystal types crossed in front of the Sun, [producing jagged edges around the circle]."

To investigate this possibility, Clark simulated the display using the HaloSim program written by atmospheric optics experts Les Cowley and Michael Shroeder. The results are shown in the upper right, above. "I used different crystal types in the upper and lower parts of this halo," explains Clark. "In the simulation, one cloud consisted of 30% of horizontal hexagonal columnar crystals and 70% hexagonal flat-plate crystals with a wide dispersion of angles of their faces to the horizontal. The other cloud contained hexagonal columnar crystals with their axes distributed randomly."

The computer-generated halo was a good match to what Clark saw. "I agree entirely with Alan's interpretation," notes Les Cowley. "It is a very unusual observation indeed. The upper halo is a fragment of a circumscribed halo generated by the horizontal column crystals. The lower halo is a fragment of the familiar 22-degree halo from randomly oriented crystals."

Look for more unusual sights in the realtime photo gallery:

Realtime Space Weather Photo Gallery

SPACE STATION FLYBYS: North Americans, if you're outside after dark and you notice a bright light slowly gliding overhead, you've likely seen the International Space Station. This week and next the behemoth spacecraft is making a series of passes over the USA and Canada--in some places several times a day. G Taylor spotted the ISS rising above Half Dome in California's Yosemite National Park on June 1st:

"This was a lucky shot," says Taylor. " I was photographing Half Dome at the time I knew the Space Station would be making an appearance... but I didn't even know if I had the camera in the right direction. The ISS appeared just after 10pm. A sliver of a moon lit up the valley."

Taylor was under dark skies when he saw the ISS, but you don't have to be. The space station is so bright, it is visible even from light-polluted cities. Check's Simple Satellite Tracker to find out when it will fly over your hometown. ISS flyby alerts: text, voice

Realtime Space Weather Photo Gallery

GIANT SOLAR FILAMENT: An enormous filament of magnetism is stretching across the sun's equator today. In this image taken by NASA's Solar Dynamics Observatory during the early hours of June 4th, arrows trace the structure across more than 500,000 km of solar terrain:

The filament is filled with dark plasma held aloft by magnetic forces. Such filaments are often unstable. If this one collapses and hits the stellar surface below, the result could be a "Hyder flare"--a type of solar flare that occurs without the aid of a sunspot. Solar flare alerts: text, voice

Because the filament is so long, it makes an easy target for backyard solar telescopes. Take a look at this panoramic snapshot taken by Sergio Castillo of Inglewood, CA, on June 3rd. "The sun is coming to life with this giant filament snaking across the solar surface," he says. "It's a beautiful view."

Realtime Space Weather Photo Gallery

Realtime Comet Photo Gallery

Realtime Meteor 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 Jun. 4, 2014, the network reported 8 fireballs.
( 8 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 June 4, 2014 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2014 KQ75
Jun 1
3 LD
39 m
2014 KH39
Jun 3
1.1 LD
25 m
2014 KQ84
Jun 5
8.6 LD
20 m
2014 KA91
Jun 6
9.1 LD
32 m
2014 HQ124
Jun 8
3.3 LD
650 m
2011 PU1
Jul 18
7.6 LD
43 m
2002 JN97
Aug 2
61.4 LD
2.0 km
2001 RZ11
Aug 17
34.2 LD
2.2 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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