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Solar wind
speed: 313.9 km/sec
density: 10.4 protons/cm3
explanation | more data
Updated: Today at 0700 UT
X-ray Solar Flares
6-hr max: B4
0053 UT May26
24-hr: B4
0053 UT May26
explanation | more data
Updated: Today at: 0559 UT
Daily Sun: 26 May 15
Not one of these sunspots poses a threat for strong flares. Solar activity is very low. Credit: SDO/HMI

Sunspot number: 66
What is the sunspot number?
Updated 26 May 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%)

Updated 26 May 2015


The Radio Sun
10.7 cm flux: 97 sfu
explanation | more data
Updated 26 May 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= 2
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 7.3 nT
Bz: 3.8 nT north
explanation | more data
Updated: Today at 0700 UT
Coronal Holes: 26 May 15

Solar wind flowing from this minor coronal hole should reach Earth on May 29-30. Credit: SDO/AIA.
Noctilucent Clouds The northern season for NLCs is about to begin. Readers should monitor the "daily daisies" below for first sightings from NASA's AIM spacecraft.
Switch view: Europe, USA, Asia, Polar
Updated at: 05-23-2015 15:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2015 May 25 2200 UTC
FLARE
0-24 hr
24-48 hr
CLASS M
01 %
01 %
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: 2015 May 25 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
20 %
20 %
MINOR
20 %
20 %
SEVERE
10 %
10 %
 
Tuesday, May. 26, 2015
What's up in space
 

Come to Tromsø and share Marianne's passion for rural photography: Chasethelighttours.co.uk invites you to experience "Heaven on Earth" with an aurora, fjord, fishing, whale watching, photography or sightseeing tour.

 
Chase the Light Tours

VERY QUIET SUN: With no sunspots actively flaring, the sun's X-ray output has flatlined. Solar activity is very low and likely to remain so for the next 24 hours. According to NOAA forecasters, the chance of a strong flare on May 26th is no more than 1%. Solar flare alerts: text, voice

SPRITES OVER OKLAHOMA: On Saturday night, May 23rd, strong thunderstorms raked Texas and Oklahoma, producing torrential rains and deadly floods. Amateur astronomer Thomas Ashcraft could see the lightning bolts all the way from New Mexico--and not all of them were going down. "There was a bright display of sprites shooting up from the tops of the thunderclouds," says Ashcraft. He took this picture using a near-infrared camera at his observatory outside Santa Fe:

Sprites are an exotic form of lightning that appear very high above Earth's surface, at the edge of space itself.

"Sprites are a true space weather phenomenon," says lightning scientist Oscar van der Velde of the Technical University of Catalonia, Spain. "They develop in mid-air around 80 km altitude, growing in both directions, first down, then up. This happens when a fierce lightning bolt draws lots of charge from a cloud near Earth's surface. Electric fields [shoot] to the top of Earth's atmosphere--and the result is a sprite."

How exotic are they? This close-up view of the Oklahoma sprites says it all:

"Turn up the volume," advises Ashcraft. "In the movie you can hear the very low frequency radio crackles from individual lightning strokes."

Although sprites have been seen for at least a century, most scientists did not believe they existed until after 1989 when sprites were photographed by cameras onboard the space shuttle. Now "sprite chasers" routinely photograph sprites from their own homes. Give it a try.

Realtime Sprite Photo Gallery

POLLEN CORONAS: It begins with a sneeze. Pollen floating through the air tickles your nose, and your body responds by expelling the allergen. Gesundheit! When the paroxysm subsides, look up at the sky. The same pollen that makes you sneeze can also make beautiful coronas around the sun, like this one photographed on May 24th by Peter Paul Hattinga Verschure of Deventer, the Netherlands:

"Springtime pollen was drifting through the air of Deventer," says Verschure. "Hiding the sun behind a lamp post revealed this corona no more than 3 degrees wide." Sharpening the image uncovers an even wider network of colorful rings: click here.

Atmospheric optics expert Les Cowley explains the phenonenon: "Coronas are produced when light waves scatter from the outsides of small particles. Tiny droplets of water in clouds make most coronas, but opaque equal-sized pollen grains do even better. They make small but very colorful multi-ringed coronas."

"Unlike water droplets, pollens are non-spherical--and this adds to their magic," he continues. "Many have air sacs to help carry them in the wind. These align the grains to give beautiful elliptical coronas with bright spots." This is why Verschure's pollen corona looks the way it does.

As northern spring unfolds, pollen coronas become increasingly common. Look for them the next time your nose feels a tickle.

Realtime Space Weather Photo Gallery


Realtime Aurora 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 Spaceweather.com.

On May. 25, 2015, the network reported 2 fireballs.
(2 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 May 26, 2015 there were 1584 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2015 KV56
May 20
12 LD
18 m
2015 KY56
May 25
5.7 LD
21 m
2015 HT9
May 25
12.1 LD
28 m
2015 KP57
May 28
10.5 LD
44 m
2015 KW120
May 29
1.1 LD
26 m
2015 KH
May 29
14.3 LD
52 m
2015 KQ120
May 31
8.6 LD
19 m
2015 KM57
Jun 3
6.6 LD
34 m
2005 XL80
Jun 4
38.1 LD
1.0 km
2012 XB112
Jun 11
10.1 LD
2 m
2015 KK57
Jun 23
8.3 LD
13 m
2005 VN5
Jul 7
12.6 LD
18 m
2015 HM10
Jul 7
1.1 LD
73 m
1994 AW1
Jul 15
25.3 LD
1.4 km
2011 UW158
Jul 19
6.4 LD
565 m
2013 BQ18
Jul 20
7.9 LD
38 m
1999 JD6
Jul 25
18.8 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.
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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