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Solar wind
speed: 309.6 km/sec
density: 3.1 protons/cm3
explanation | more data
Updated: Today at 2347 UT
X-ray Solar Flares
6-hr max: B7
1957 UT May25
24-hr: B7
1957 UT May25
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 25 May 15
Not one of these sunspots poses a threat for strong flares. Solar activity is very low. Credit: SDO/HMI

Sunspot number: 74
What is the sunspot number?
Updated 25 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 25 May 2015


The Radio Sun
10.7 cm flux: 99 sfu
explanation | more data
Updated 25 May 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
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 4.3 nT
Bz: 0.5 nT north
explanation | more data
Updated: Today at 2349 UT
Coronal Holes: 25 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 %
 
Monday, May. 25, 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 an X-class flare on May 25th is no more than 1%. Solar flare alerts: text, voice

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

VOLCANIC GAS CIRCUMNAVIGATES THE GLOBE: Last month, on April 22nd, Chile's Calbuco volcano erupted, blowing plumes of ash and sulfurous gas more than 50,000 feet high. Since then, the swirling plumes have spread around the southern hemisphere--traveling eastward from South America to southern Africa to Australia/New Zealand. Just a few days ago, the plumes completed the circle.

"We are seeing volcanic sunsets again in Rio," reports Brazilian photographer Helio de Carvalho Vital, who took this picture on May 17th:

Back in April, Vital was among the first to notice colorful sunsets in the immediate aftermath of Calbuco. "I spotted the first effects of the volcano on April 24 and monitored the bulk of the plume on April 26, 27 and 28 as it was heading east. Colorful sunsets were visible from Rio for a week after that."

A primary color of volcanic sunsets is purple: Fine volcanic aerosols in the stratosphere scatter blue light which, when mixed with ordinary sunset red, produces a violet hue. Purple isn't the only color, though. Volcanic sunsets can also include a bright yellow twilight arch and long diffuse rays and shadows.

After a 3 week intermission, purple has returned to Brazil. "It is subtle," notes Vital. "A camera is required to fully capture the effect. This suggests that the plumes are now much more tenuous than three weeks ago."

A purple sighting last night in New Zealand further suggests that Calbuco's exhaust is thinly spread around the southern hemisphere. Photographers in southern Africa, Argentina, Chile, southern parts of Brazil, and Australia should remain alert for similar displays.

Realtime Space Weather Photo Gallery


Realtime Sprite 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 25, 2015 there were 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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