Solar wind
speed: 494.0 km/sec
density: 3.7 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0620 UT
X-ray Solar Flares
6-hr max: B7
0305 UT Jan21
24-hr: B7
0305 UT Jan21
explanation | more data
Updated: Today at: 0600 UT
Daily Sun: 20 Jan 17
Sunspots AR2625 and AR2626 have stable magnetic fields that pose no threat for strong flares. Credit: SDO/HMI

Sunspot number: 61
What is the sunspot number?
Updated 20 Jan 2017

Spotless Days
Current Stretch: 0 days
2017 total: 10 days (53%)
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 Jan 2017


The Radio Sun
10.7 cm flux: 80 sfu
explanation | more data
Updated 20 Jan 2017

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 3
quiet
explanation | more data
Interplanetary Mag. Field
Btotal: 4.2 nT
Bz: -2.0 nT north
more data: ACE, DSCOVR
Updated: Today at 0620 UT
Coronal Holes: 20 Jan 17

Earth is inside a stream of solar wind flowing from the indicated coronal hole. 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: 01-20-2017 22:55:02
SPACE WEATHER
NOAA Forecasts
Updated at: 2017 Jan 20 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: 2017 Jan 20 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
10 %
MINOR
05 %
01 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
20 %
20 %
MINOR
25 %
25 %
SEVERE
20 %
15 %
 
Saturday, Jan. 21, 2017
What's up in space
       
 

Marianne's Arctic Xpress supports World Cancer Day by donating 50% of the price paid on all bookings Feb. 3-5 to cancer research. Arctic clothing and semi-pro cameras included. Groups of 2 to 8 welcome. Book Now

 

CHANCE OF STORMS: NOAA forecasters say there is a 40% chance of polar geomagnetic storms on Jan. 20th as a solar wind stream gently buffets Earth's magnetic field. Arctic sky watchers should remain alert for auroras on Friday night. Free: Aurora Alerts

RADIATION CLOUDS AT AVIATION ALTITUDES: A new study published in the peer-reviewed journal Space Weather reports the discovery of radiation "clouds" at aviation altitudes. When airplanes fly through these clouds, dose rates of cosmic radiation normally absorbed by air travelers can double or more.

"We have flown radiation sensors onboard 264 research flights at altitudes as high as 17.3 km (56,700 ft) from 2013 to 2017," says Kent Tobiska, lead author of the paper and PI of the NASA-supported program Automated Radiation Measurements for Aerospace Safety (ARMAS). "On at least six occasions, our sensors have recorded surges in ionizing radiation that we interpret as analogous to localized clouds."

The fact that air travelers absorb radiation is not news.  Researchers have long known that cosmic rays crashing into Earth's atmosphere create a spray of secondary particles such as neutrons, protons, electrons, X-rays and gamma-rays that penetrate aircraft.  100,000 mile frequent flyers absorb as much radiation as 20 chest X-rays—and even a single flight across the USA can expose a traveler to more radiation than a dental X-ray.

Conventional wisdom says that dose rates should vary smoothly with latitude and longitude and the height of the aircraft.  Any changes as a plane navigates airspace should be gradual.  Tobiska and colleagues have found something quite different, however: Sometimes dose rates skyrocket for no apparent reason.

"We were quite surprised to see this," says Tobiska.

All of the surges they observed occurred at relatively high latitudes, well above 50 degrees in both hemispheres. One example offered in their paper is typical: On Oct 3, 2015, an NSF/NCAR research aircraft took off from southern Chile and flew south to measure the thickness of the Antarctic ice shelf.  Onboard, the ARMAS flight module recorded a 2x increase in ionizing radiation for about 30 minutes while the plane flew 11 km (36,000 feet) over the Antarctic Peninsula.  No solar storm was in progress.  The plane did not abruptly change direction or altitude.  Nevertheless, the ambient radiation environment changed sharply. Similar episodes have occurred off the coast of Washington state.

Above: Radiation measurements made by ARMAS while flying over Antarctica. The colored points are from ARMAS. The black points are from a NASA computer model (NAIRAS) predicting radiation dose rates. Throughout the flight, ARMAS observed higher dose rates than predicted by the model, including a surge highlighted in pink.

What's going on?

"We're not sure," says Tobiska, "but we have an idea."

Earth's magnetic field, he explains, traps many cosmic rays and solar energetic particles in structures called "magnetic bottles."  These bottles can be leaky.  Even minor gusts of solar wind can cause the trapped particles to squirt out the ends of the bottle, sending beams of particles down toward the Earth below.

"Basically, we think we might be flying through some of these leaky particle beams," says Tobiska.

Tobiska notes that a team of South Korean researchers has observed similar variations in radiation while flying sensors onboard a military aircraft near the border between the two Koreas (Lee et al 2015).  If the phenomena are the same, the Korean measurements would suggest that "radiation clouds" may exist at middle latitudes, too.

The ARMAS program has a busy flight schedule in 2017. "We'll be looking carefully for more 'clouds' as we continue to characterize the radiation environment at aviation altitudes," says Tobiska.

Stay tuned for updates and, meanwhile, read Tobiska et al's original research at this URL:  http://onlinelibrary.wiley.com/doi/10.1002/2016SW001419/abstract

Sharable permalink to this article: Radiation Clouds at Aviation Altitudes

Realtime Space Weather Photo Gallery

SUNSET IN THE STRATOSPHERE: Nothing says "I love you" like a bear from space. To raise money for their cosmic ray research program, the students of Earth to Sky Calculus have flown a payload-full of Valentine's bears to the edge of space. This was a special flight, timed to photograph the bears at sunset in the stratosphere, wrapped in the romantic light of the fading sun 98,000 feet above Earth's surface:

You can have one for $49.95. Each bear comes with a Valentine's card showing the bears in flight and telling the story of their trip to the stratosphere.

More far-out Valentine's gifts may be found in the Earth to Sky store. All proceeds support cosmic ray balloon flights and STEM education.

Realtime Aurora Photo Gallery


Realtime Airglow Photo Gallery


Realtime Sprite 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 Jan. 20, 2017, the network reported 14 fireballs.
(14 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 January 21, 2017 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2016 YC8
Jan 18
9.5 LD
52 m
2015 BB
Jan 18
13.8 LD
45 m
2002 LS32
Jan 24
53.9 LD
1.0 km
1991 VK
Jan 25
25.2 LD
1.9 km
2000 WN107
Jan 26
62.3 LD
2.8 km
2017 AK3
Jan 26
11.3 LD
52 m
2016 YP4
Jan 26
12.6 LD
18 m
2005 VL1
Feb 4
9.1 LD
18 m
2013 FK
Feb 5
7.1 LD
101 m
2014 DV110
Feb 10
9.8 LD
45 m
2015 QR3
Feb 12
13.1 LD
31 m
2013 WT67
Feb 17
44.2 LD
1.1 km
1992 FE
Feb 24
13.1 LD
275 m
1998 QK56
Feb 24
53 LD
1.2 km
2012 DR32
Mar 2
2.7 LD
52 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.

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  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
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Daily Sunspot Summaries
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