Solar wind
speed: 445.6 km/sec
density: 2.3 protons/cm3
explanation | more data
Updated: Today at 0320 UT
X-ray Solar Flares
6-hr max: B2
1941 UT May31
24-hr: B2
1941 UT May31
explanation | more data
Updated: Today at: 2359 UT
Daily Sun: 31 May 16
None of these sunspots pose a threat for strong flares. Solar activity remains low. Credit: SDO/HMI

Sunspot number: 40
What is the sunspot number?
Updated 31 May 2016

Spotless Days
Current Stretch: 0 days
2016 total: 0 days (0%)
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 31 May 2016


The Radio Sun
10.7 cm flux: 86 sfu
explanation | more data
Updated 31 May 2016

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 3.3 nT
Bz: 2.9 nT north
explanation | more data
Updated: Today at 0320 UT
Coronal Holes: 31 May 16
Solar wind flowing from the indicated coronal hole could reach Earth on June 5th. Credit: SDO/AIA.
Noctilucent Clouds Images from NASA's AIM spacecraft are once again appearing on Spaceweather.com. Check back daily for space-based sightings of noctilucent clouds.
Switch view: Europe, USA, Asia, Polar
Updated at: 05-31-2016 17:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2016 May 31 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: 2016 May 31 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
10 %
10 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
20 %
20 %
SEVERE
20 %
15 %
 
Wednesday, Jun. 1, 2016
What's up in space
       
 

It's waiting for you: The most successful Aurora Photo Tour on Earth! 100% success rate 4 years in a row and winner of the TripAdvisor Certificate of Excellence Award. Join LapplandMedia's aurora tours in Abisko, Swedish Lapland!

 

SOLAR WIND HAS LITTLE EFFECT: As predicted, Earth passed through a stream of fast-moving solar wind on May 30th. The encounter did little to stoke geomagnetic activity, however, because magnetic fields in the stream did not make a good connection to our planet. NOAA forecasters have downgraded the odds of a geomagnetic storm on May 31st to only 30%, waning further to 15% by June 2nd. Aurora alerts: text, voice.

AMATEUR ASTRONOMER PHOTOGRAPHS BEAM: There's a new room on the International Space Station. NASA inflated it Saturday. The Bigelow Expandable Activity Module (BEAM) was filled with air by astronaut Jeff Williams as the ISS flew over the south Pacific, kicking off an experiment to learn how inflatable habitats perform in a microgravity environment. "I think I am the first amateur astronomer to photograph BEAM from Earth," says Philip Smith, who sends these before-and-after images from Manorville, New York:

"Using a backyard telescope, I tracked the ISS as it passed overhead on May 26th (before inflation) and May 28th (after)," says Smith. "The new addition was clearly visible in my images."

"The Bigelow Aerospace-built BEAM is a prototype space habitat for future space stations, moon colonies and moon bases," he adds. "I am glad to be a small part of that history."

BEAM will remain attached to station for a two-year test period. Astronauts will not occupy the new room, but they will enter from time to time and monitor its performance. For more information about BEAM, visit: www.nasa.gov/beam.

Realtime Space Weather Photo Gallery

STRANGE SUNSET: On the evening of May 26th, Michelle Bertnick stood on a beach near Fort Bragg, California, overlooking the Pacific Ocean. As the sun set behind the waves, something strange happened, and this was just the beginning:

Atmospheric optics expert Les Cowley explains: "Bertnick witnessed a strange miraged sunset made by several strong temperature inversion layers stacked unusually high above the ocean. Usually the inversions (warmer air over colder) hug the sea and mirage the lower part of the sun into slices. In this case, the inversions 'copied' a slice of the sun and 'pasted' it above the 'real' sun. Each inversion layer seems to have copied the same bit to give the rectangular shape."

After this rectangular apparition, something else happened. "There was a wonderful green flash (photo)" says Bertnick. "It started very bright and I had just enough time to catch a few shots before it went away! I have tried to catch a green flash at sunset for a long time, and this one took me by surprise."

"Sunset mirages and green flashes are frequent along the California coast," adds Cowley." They are made by the cold offshore current overlain by warm air from inland. Look out for them!"

SPACE BEARS MAKE GOOD GRADUATION GIFTS: Around the USA, high school seniors are preparing to receive their diplomas. Nothing says "you're on your way up!" better than a graduation gift from the Edge of Space. On May 25th, the students of Earth to Sky Calculus flew a family of "graduation grizzlies" 27 km (90,000 feet) above Earth's surface:

Outfitted with space helmets and a diploma, the intrepid Ursidae survived cosmic rays, ultra-low temperatures, and the near-vacuum of the stratosphere. For $49.95 you can have one of these bears along with a unique Graduation card showing the bears floating at the top of Earth's atmosphere. Buy one now.

Sales of the bears support student space weather research. In fact, the bears pictured above were hitchhiking on a payload equipped with radiation sensors. We send the sensors to the stratosphere every week to monitor increasing levels of cosmic rays. Visit the Earth to Sky store to support this crowd-funded research.

Realtime Aurora Photo Gallery


Realtime Sprite Photo Gallery


Realtime Noctilucent Cloud 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. 31, 2016, 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 June 1, 2016 there were 1703 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2016 KJ
May 27
7.1 LD
48 m
2016 JB29
Jun 4
12.1 LD
50 m
2016 KR
Jun 5
9.9 LD
37 m
1997 XF11
Jun 10
70 LD
1.8 km
2016 KL
Jun 10
5.7 LD
35 m
2015 XZ378
Jun 13
9.7 LD
16 m
2009 CV
Jun 20
12.4 LD
60 m
2010 NY65
Jun 24
10.7 LD
215 m
2002 KL6
Jul 22
26.6 LD
1.4 km
2011 BX18
Jul 25
52.7 LD
1.1 km
2005 OH3
Aug 3
5.8 LD
28 m
2000 DP107
Aug 12
66.5 LD
1.0 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.
  Cosmic Rays in the Atmosphere
Situation Report -- Oct. 30, 2015 Stratospheric Radiation (+37o N)
Cosmic ray levels are elevated (+6.1% above the Space Age median). The trend is flat. Cosmic ray levels have increased +0% in the past month.
Sept. 06: 4.14 uSv/hr (414 uRad/hr)
Sept. 12: 4.09 uSv/hr (409 uRad/hr)
Sept. 23: 4.12 uSv/hr (412 uRad/hr)
Sept. 25: 4.16 uSv/hr (416 uRad/hr)
Sept. 27: 4.13 uSv/hr (413 uRad/hr)
Oct. 11: 4.02 uSv/hr (402 uRad/hr)
Oct. 22: 4.11 uSv/hr (411 uRad/hr)
These measurements are based on regular space weather balloon flights: learn more.

Approximately once a week, Spaceweather.com and the students of Earth to Sky Calculus fly "space weather balloons" to the stratosphere over California. These balloons are equipped with radiation sensors that detect cosmic rays, a surprisingly "down to Earth" form of space weather. Cosmic rays can seed clouds, trigger lightning, and penetrate commercial airplanes. Our measurements show that someone flying back and forth across the continental USA, just once, can absorb as much ionizing radiation as 2 to 5 dental X-rays. For example, here is the data from a flight on Oct. 22, 2015:

Radiation levels peak at the entrance to the stratosphere in a broad region called the "Pfotzer Maximum." This peak is named after physicist George Pfotzer who discovered it using balloons and Geiger tubes in the 1930s. Radiation levels there are more than 80x sea level.

Note that the bottom of the Pfotzer Maximim is near 55,000 ft. This means that some high-flying aircraft are not far from the zone of maximum radiation. Indeed, according to the Oct 22th measurements, a plane flying at 45,000 feet is exposed to 2.79 uSv/hr. At that rate, a passenger would absorb about one dental X-ray's worth of radiation in about 5 hours.

The radiation sensors onboard our helium balloons detect X-rays and gamma-rays in the energy range 10 keV to 20 MeV. These energies span the range of medical X-ray machines and airport security scanners.

  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
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