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Solar wind
speed: 559.9 km/sec
density: 0.1 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B3
2257 UT May28
24-hr: B9
0447 UT May28
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 28 May 13
None of these magnetically-simple sunspots poses a threat for strong solar flares. Credit: SDO/HMI
Sunspot number: 87
What is the sunspot number?
Updated 28 May 2013

Spotless Days
Current Stretch: 0 days
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%)
Since 2004: 821 days
Typical Solar Min: 486 days

Update
28 May 2013

The Radio Sun
10.7 cm flux: 110 sfu
explanation | more data
Updated 28 May 2013

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/POES
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 3.1 nT
Bz: 0.9 nT north
explanation | more data
Updated: Today at 1634 UT
Coronal Holes: 28 May 13
Solar wind flowing from this coronal hole should hit Earth's magnetic field on June 2-3. Credit: SDO/AIA.

NEW: Spaceweather.com is now posting 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: 05-28-2013 10:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2013 May 28 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
05 %
05 %
CLASS X
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: 2013 May 28 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
10 %
10 %
MINOR
01 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
20 %
20 %
SEVERE
15 %
15 %
 
Tuesday, May. 28, 2013
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

SOLAR WIND STORM: For the third day in a row, a remarkably fast (600 km/s - 700 km/s) stream of solar wind is blowing around Earth. This is causing magnetic unrest around the poles as well as elevated levels of high-energy electrons in Earth orbit. NOAA cautions satellite operators that "satellite systems may experience significant charging" in response to accumulated electrons. SWx alerts: text, voice.

BEAUTIFUL VENUS-JUPITER PAIRING: The sunset triangle of May 26th is breaking up, but the show is not over. As the triple conjunction disperses, Venus is passing Jupiter only 1 degree away. Watching the two brightest planets move so close together is a wonderful way to end the day. Look west at sunset! NASA: video, full story.

Pictures of Sunday's night's triangular conjunction are still pouring in. This one shows Pat and Fred Espenak watching the show from the sky deck of Bifrost Astronomical Observatory:

"The planets Jupiter, Venus and Mercury (left to right) formed a conspicuous triangle during evening twilight on May 26th," says Fred. "This is the climax of a several-week-long triple planetary alignment as all three bright planets appear together in the evening sky."

"To see how the event will change in the nights ahead," he adds, "I've prepared some viewing charts."

Realtime Planet Photo Gallery

NOCTILUCENT CLOUD SEASON BEGINS: Over the weekend, sky watchers in northern Europe and Canada spotted electric-blue tendrils of light reaching out of the western sky at sunset. This signals the beginning of the 2013 season for noctilucent clouds (NLCs). Photographer Silvar Mehik sends this picture from the island of Saaremaa in Estonia:

NLCs are Earth's highest clouds. In the upper atmosphere, 80+ km high, tiny ice crystals nucleate around meteoroids and other aerosols. When the crystals catch the rays of the setting sun, they glow electric blue. For reasons that are not fully understood, these highest and coldest of clouds form during the warmest months on the ground--late spring and summer.

Noctilucent clouds first appeared in the 19th century after the eruption of super-volcano Krakatoa. At the time, people thoght the clouds were caused by the eruption, but long after Krakatoa's ash settled, the clouds remained. In those days, NLCs were a polar phenomenon confined mainly ro far-northern places such as Scandinavia or Alaska. In recent years they have intensified and spread with sightings as far south as Utah and Colorado. Could this be a sign of climate change? A NASA spacecraft named "AIM" is in orbit to investigate.

NEW! Daily images from AIM are now published here on Spaceweather.com. To find them, look in the left column of the home page and scroll down below the coronal holes.

High latitude sky watchers should be alert for NLCs in the evenings ahead. Observing tips: Look west 30 to 60 minutes after sunset when the sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you've probably spotted a noctilucent cloud.

Realtime Noctilucent Cloud Photo Gallery
[previous years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011]


Realtime Space Weather Photo Gallery


Realtime Aurora Photo Gallery


Realtime Comet Photo Gallery

  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 May 28, 2013 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2013 KB
May 22
3.2 LD
16 m
2013 KS1
May 22
4.8 LD
19 m
2004 BV102
May 25
69.9 LD
1.4 km
1998 QE2
May 31
15.2 LD
1.6 km
2009 FE
Jun 4
9.6 LD
230 m
2000 FM10
Jun 5
50.3 LD
1.3 km
2002 KL3
Jun 6
66.4 LD
1.1 km
1999 WC2
Jun 12
39.2 LD
1.9 km
2006 RO36
Jun 18
70.9 LD
1.2 km
2001 PJ9
Jul 17
29.2 LD
1.1 km
2006 BL8
Jul 26
9.3 LD
48 m
2003 DZ15
Jul 29
7.6 LD
153 m
2005 WK4
Aug 9
8.1 LD
420 m
1999 CF9
Aug 23
24.7 LD
1.1 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.
STEREO
  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
Heliophysics
  the underlying science of space weather
Space Weather Alerts
   
  more links...
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