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SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
 
Solar wind
speed: 461.8 km/sec
density: 6.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0002 UT
X-ray Solar Flares
6-hr max: B3
1703 UT Feb20
24-hr: B7
1425 UT Feb20
explanation | more data
Updated: Today at: 2300 UT
Daily Sun: 20 Feb 17
A moderately large sunspot group is emerging at the circled location.. Credit: SDO/HMI

Sunspot number: 23
What is the sunspot number?
Updated 20 Feb 2017

Spotless Days
Current Stretch: 0 days
2017 total: 11 days (22%)
2016 total: 32 days (9%)
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 20 Feb 2017


The Radio Sun
10.7 cm flux: 78 sfu
explanation | more data
Updated 20 Feb 2017

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 3 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 4.7 nT
Bz: 2.8 nT north
more data: ACE, DSCOVR
Updated: Today at 0001 UT
Coronal Holes: 20 Feb 17

An unusually broad coronal hole is cutting across the southern hemisphere of the sun. Credit: NASA/SDO.
Noctilucent Clouds The southern season for noctilucent clouds began on Nov. 17, 2016. Come back to this spot every day to see the "daily daisy" from NASA's AIM spacecraft, which is monitoring the dance of electric-blue around the Antarctic Circle.
Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, Polar
Updated at: 02-20-2017 18:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2017 Feb 20 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: 2017 Feb 20 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
30 %
MINOR
05 %
15 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
30 %
30 %
SEVERE
30 %
40 %
 
Monday, Feb. 20, 2017
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 for out of this world day and night adventures.

 

NEW SUNSPOT GROUP: A moderately large sunspot group is rotating into view over the sun's northeastern limb. So far it appears to be stable and quiet like every other sunspot this year. Its potential for solar flares will become better known in the days ahead as it turns to face Earth and provides a clearer view of its magnetic topology. See the sunspot!

PLANET-SIZED MAGNETIC LOOP: Astronomers are monitoring a beautiful solar prominence today. It's emerging from a new sunspot group rotating over the sun's eastern limb. This picture, taken on Feb. 19th by Giampaolo Salvato of Padova, Italy, shows the prominence with Earth side-by-side for comparison. Croquet anyone?

Prominences are magnetic loops filled with hot-glowing gas. They're often seen when sunspots are near the edge of the solar disk. Magnetic loops form a canopy above sunspot groups, and it is within this canopy that solar flares sometimes explode. Will this loop be a blast? Amateur astronomers with solar telescopes are encouraged to monitor developments.

Realtime Space Weather Photo Gallery

GREEN MOUNTAINS IN NORWAY: During an outburst of Northern Lights, most people stare at the sky. Sometimes, however, it pays to look at the ground. "On Feb. 18th, the mountains around us turned green," reports Didier Van Hellemojt from Tromsø, Norway, more than 200 miles north of the Arctic Circle. "The snowy slopes reflected the color of the green auroras overhead."

Green terrain could become a common sight in the nights ahead. Earth is inside a wide stream of solar wind that will influence our planet, off and on, for the rest of the month. Activity could reach a crescendo at the end of February when, according to NOAA analysts, G2-class geomagnetic storms could erupt around the Arctic Circle. Stay tuned for updates. Free: Aurora Alerts

Realtime Aurora Photo Gallery

AN UNUSUAL FLYBY: On Feb. 11th, green Comet 45P/Honda-Mrkos-Pajdusakova flew past our planet in one of the closest Earth-comet encounters of the Space Age.  It was a disappointment, though, as the fizzling comet was too dim to see with the unaided eye.  A week later, the comet executed a much more satisfying flyby--of two distant galaxies. Michael Jäger of Stixendorf, Austria, photographed the event on Feb. 18th:

Located 25 million light years away, these two galaxies have been nicknamed by astronomers "The Whale and the Hockey Stick." The strange shape of the Hockey Stick is thought to result from a long-ago encounter with the Whale.  No one can say exactly what happened. Probably the Whale's gravity probably pulled a plume of star forming gas from the body of the other galaxy, transforming the starry disk into something akin to a bent stick.  The official names of these star systems are NGC4656 and NGC4631.

More photos of this unusual flyby may be found in the Realtime Comet Photo Gallery.  Enjoy!

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 Feb. 20, 2017, the network reported 11 fireballs.
(11 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 February 20, 2017 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2013 WT67
Feb 17
44.2 LD
1.1 km
2017 DF
Feb 19
2.1 LD
21 m
2017 DB
Feb 20
1.8 LD
17 m
2017 DD
Feb 23
14.5 LD
95 m
2017 BY93
Feb 23
2.4 LD
102 m
1992 FE
Feb 24
13.1 LD
275 m
2017 CP1
Feb 24
3.6 LD
51 m
1998 QK56
Feb 24
53 LD
1.2 km
2017 BM123
Feb 27
12.4 LD
80 m
2012 DR32
Mar 2
2.7 LD
52 m
1998 SL36
Mar 16
8.3 LD
390 m
2015 TC25
Mar 26
7.6 LD
6 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.
  Cosmic Rays in the Atmosphere

Readers, thank you for your patience while we continue to develop this new section of Spaceweather.com. 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, 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. 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.

  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
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NOAA 27-Day Space Weather Forecasts
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Aurora 30 min forecast
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