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<<back forward>> -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
Solar wind
speed: 441.5 km/sec
density: 2.7 protons/cm3
explanation | more data
Updated: Today at 2210 UT
X-ray Solar Flares
6-hr max: C2
1917 UT Sep22
24-hr: C5
0547 UT Sep22
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 22 Sep 16
None of these small sunspots poses a threat for strong explosions. Solar flare activity remains very low. Credit: SDO/HMI

Sunspot number: 35
What is the sunspot number?
Updated 22 Sep 2016

Spotless Days
Current Stretch: 0 days
2016 total: 20 days (8%)
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 22 Sep 2016

The Radio Sun
10.7 cm flux: 86 sfu
explanation | more data
Updated 22 Sep 2016

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 0 quiet
24-hr max: Kp= 2
explanation | more data
Interplanetary Mag. Field
Btotal: 4.6 nT
Bz: 1.7 nT north
explanation | more data
Updated: Today at 2210 UT
Coronal Holes: 22 Sep 16

Earth is exiting a stream of solar wind flowing from the indicated coronal hole. Credit: NASA/SDO.
Noctilucent Clouds NASA's AIM spacecraft has suffered an anomaly, and a software patch is required to fix it. As a result, current noctilucent cloud images will not return until late September 2016.
Switch view: Europe, USA, Asia, Polar
Updated at: 08-06-2016 16:55:02
NOAA Forecasts
Updated at: 2016 Sep 22 2200 UTC
0-24 hr
24-48 hr
01 %
01 %
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 Sep 22 2200 UTC
0-24 hr
24-48 hr
15 %
10 %
01 %
01 %
01 %
01 %
High latitudes
0-24 hr
24-48 hr
15 %
15 %
20 %
15 %
20 %
15 %
Thursday, Sep. 22, 2016
What's up in space

Directly under the Arctic Circle! Marianne's Arctic Xpress in Tromsø offers fjord, whale and wildlife tours by day, aurora tours by night. Book Now and get a 10% discount on combo day and night adventures.


AURORA SEASON BEGINS TODAY: Today is the first day of northern autumn. That means aurora season has begun. For reasons that researchers don't fully understand, geomagnetic storms love equinoxes. At this time of year, even a gentle gust of solar wind can spark a bright display of lights around the Arctic circle. More: Autumn is Aurora Season

NEW! RADS ON A PLANE: is now reporting data you won't find anywhere else: Regular measurements of cosmic rays at aviation altitudes. Approximately once a week, we launch high-altitude balloons equipped with X-ray/gamma-ray sensors. En route to the stratosphere over California the payload passes through aviation altitudes. Here are 18 months' worth of data at 25,000 ft and 40,000 ft:

In this plot, dose rates are expressed as multiples of sea level. For instance, we see that boarding a plane that flies at 25,000 feet exposes passengers to dose rates ~10x higher than sea level. At 40,000 feet, the multiplier is closer to 50x.

Cosmic rays and solar activity have a yin-yang relationship. When the sun grows quiet (as it has been doing), cosmic rays increase. We have already observed this effect in the stratosphere, where radiation levels have increased by more than 12% since 2015. Will these increases eventually trickle down to aviation altitudes?  Our monitoring program will answer that question as the solar cycle continues to ebb.

To view the latest data, scroll down from here to the section entitled "Cosmic Rays in the Atmosphere."

CHINESE SPACE STATION SIGHTED: Last week, on Sept. 15th, China launched a new space station to Earth orbit: Tiangong-2. The 10-meter long spacecraft is only a fraction the size of the ISS, but there is room inside for two tiakonauts (Chinese astronauts) and plenty of science experiments. And in dark skies, it can be seen with the naked eye. On Sept. 20th, Kevin Fetter of Brockville, Ontario, Canada, video-recorded the Tiangong-2 passing by the bright star Zeta Ophiuchi:

"At the time the space station was passing the star, its magnitude was near +5," estimates Fetter."It got into the 4th magnitude range just before it disappeared into Earth's shadow. So it is a naked-eye object, albeit barely."

Tiangong-2 is the second of three prototype space stations China plans to launch as the country builds toward a Mir-class outpost in the next decade. Tiangong-2's predecessor, Tiangong-1, is still in orbit and expected to burn up in Earth's atmosphere sometime in 2017.

Next month, China will launch a crew of two to inhabit the new space station for approximately 30 days. While on board, they will test Tiangong-2's life support system, and possibly conduct experiments in brain-machine interfacing, atomic clock navigation, and quantum communications.

Ready to see for yourself? Tiangong-2 flyby predictions are available from Heavens Above. "Use the Satellite Database and search for object '41765' labeled 'OBJECT A,'" advises Fetter. "That's how to find it."

Update: Last night, Sept. 21st, Gary of Fort Davis, Texas, saw the new space station flying over his own backyard:

"It streaked through Ursa Minor not far from the North Star," he says. "Shining like a 4th magnitude star, Tiangong-2 was brighter than I expected."

Realtime Space Weather Photo Gallery

SOLAR WIND SPARKS AURORAS: A fast-moving stream of solar wind is buffeting Earth's magnetic field. In response, auroras are dancing around the Arctic Circle. "The magnetic storm hit us as expected [on Sept.20th]!" reports Rayann Elzein from the UNESCO Ilulissat Icefjord World Heritage site in Greenland. "We had such an amazing show!"

"Imagine the icebergs calving in the background and hearing some whales going about in the sea around the fjord with a huge corona forming above our heads!" describes Elzein. "The bright moon was a superb addition to the magic."

He also photographed a surprising splash of red among the green.  "We could not dream for a better background," he says.

More auroras are possible tonight as Earth as the solar wind continues to blow.  Monitor the photo gallery for sightings. Free: Aurora Alerts

Realtime Aurora Photo Gallery

Realtime Sprite Photo Gallery

  Cosmic Rays in the Atmosphere

: Sept. 20, 2016 // Next Flight: Sept. 27, 2016

Sept. 20, 2016: Readers, thank you for your patience while we continue to develop this new section of We've been working to streamline our data reduction, allowing us to post results from balloon flights much more rapidly, and we have developed a new data product, shown here:

This plot displays radiation measurements not only in the stratosphere, but also at aviation altitudes. Dose rates are expessed as multiples of sea level. For instance, we see that boarding a plane that flies at 25,000 feet exposes passengers to dose rates ~10x higher than sea level. At 40,000 feet, the multiplier is closer to 50x. These measurements are made by our usual cosmic ray payload as it passes through aviation altitudes en route to the stratosphere over California.

What is this all about? Approximately once a week, 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. Furthermore, there are studies ( #1, #2, #3, #4) linking cosmic rays with cardiac arrhythmias and sudden cardiac death in the general population. Our latest measurements show that cosmic rays are intensifying, with an increase of more than 12% since 2015:

Why are cosmic rays intensifying? The main reason is the sun. Solar storm clouds such as coronal mass ejections (CMEs) sweep aside cosmic rays when they pass by Earth. During Solar Maximum, CMEs are abundant and cosmic rays are held at bay. Now, however, the solar cycle is swinging toward Solar Minimum, allowing cosmic rays to return. Another reason could be the weakening of Earth's magnetic field, which helps protect us from deep-space radiation.

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.

The data points in the graph above correspond to the peak of the Reneger-Pfotzer maximum, which lies about 67,000 feet above central California. When cosmic rays crash into Earth's atmosphere, they produce a spray of secondary particles that is most intense at the entrance to the stratosphere. Physicists Eric Reneger and Georg Pfotzer discovered the maximum using balloons in the 1930s and it is what we are measuring today.

  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 Sep. 22, 2016, the network reported 22 fireballs.
(22 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 September 22, 2016 there were 1730 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Miss Distance
2016 QS11
Sep 18
12.2 LD
30 m
2016 RM20
Sep 20
6.2 LD
25 m
2009 UG
Sep 30
7.3 LD
101 m
2100 Ra-Shalom
Oct 9
58.3 LD
1.1 km
2014 UR
Oct 18
12 LD
21 m
2005 SE71
Oct 24
72.2 LD
1.0 km
2003 TL4
Oct 27
10.1 LD
565 m
2003 YT1
Oct 31
13.5 LD
850 m
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
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