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Space Weather Update: 03/23/2017

By, 03/23/2017

LOOKING AHEAD: Today, Earth is inside a fast-moving stream of solar wind, which is expected to influence our planet until it leaves on March 25th.  The ensuing calm won't last long. Another stream of solar wind is following close behind. G1- and G2-class geomagnetic storms are possible when it arrives on March 28th. Arctic sky watchers should be alert for auroras next week. Free:Aurora Alerts

AN EXPLOSION OF GREEN: A hole in the sun's atmosphere is spewing solar wind toward Earth and, as a result, the Arctic Circle is glowing with bright auroras. Last night in Fairbanks, Alaska, "the auroras came on like an explosion with hundreds of aftershocks," reports Sacha Layos, who watched the sky fill with waves of green:


"The entire night of March 22nd was dynamic and delightful," says Layos.

More auroras are in the offing. Solar wind speeds are currently topping 600 km/s as Earth moves deeper into the gaseous stream.  NOAA forecasters estimate a 60% chance of polar geomagnetic storms on March 23rd. Free: Aurora Alerts

Realtime Aurora Photo Gallery

EXQUISITE CRESCENT: This week, Venus is passing between Earth and the sun and, by doing so, turning its night side toward Earth.  At the moment, all we can see of Venus is an exquisitely slender crescent.  Maximilian Teodorescu photographed the second planet's shape from Magurele, Romania:


"Venus was lovely today at 200x thorough my 14 inch telescope," says Teodorescu. "Despite the mostly poor seeing, the superb thin crescent of Venus was a truly fantastic sight."

The Venus-sun distance will be least on March 25th (only 8.5 degrees)--a moment astronomers call "inferior solar conjunction." This is the most beautiful time to observe Venus, but also the most perilous. The glare of the nearby sun magnified by a telescope can damage the eyes of anyone looking through the eyepiece.

Anthony J. Cook of the Griffith Observatory has some advice for observers: "I have observed Venus at conjunction, but only from within the shadow of a building, or by adding a mask to the front end of the telescope to fully shadow the optics from direct sunlight. This is tricky with a refractor or a catadioptric, because the optics start at the front end of the tube. Here at Griffith Observatory, I rotate the telescope dome to make sure the lens of the telescope is shaded from direct sunlight, even through it means that the lens will be partially blocked when aimed at Venus. With our Newtonian telescope, I add a curved cardboard mask at the front end of the tube to shadow the primary mirror."

Realtime Venus Photo Gallery

THE FLIGHT OF THE EASTERNAUTS: The cosmic ray monitoring program ofEarth to Sky Calculus is not supported by government grants or big corporate sponsors.  Instead we rely on you.  That is, you and the Easternauts:


On March 2nd, the student researchers flew a payload-full of Easter bunnies to the edge of space--and you can have one for $39.95. (Space helmet included!) They make great Easter gifts for young scientists, and all proceeds support STEM education.  Each bunny comes with a greeting card showing the Easternaut in flight and telling the story of its journey to the stratosphere and back again.

More far-out gifts may be found in the Earth to Sky store.

Realtime Space Weather 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

On Mar. 22, 2017, the network reported 29 fireballs.
(29 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 March 23, 2017 there were 1780 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:



Miss Distance


2017 FS

Mar 19

0.3 LD

7 m

2017 FK

Mar 20

1.7 LD

15 m

2017 FN1

Mar 20

0.2 LD

4 m

2017 FM1

Mar 20

0.3 LD

5 m

2017 FJ

Mar 21

2 LD

10 m

2017 FO

Mar 21

12.2 LD

23 m

2017 FJ3

Mar 22

2.6 LD

5 m

2017 FZ2

Mar 23

1.7 LD

19 m

2015 TC25

Mar 26

7.6 LD

6 m

2017 FF3

Mar 27

5.7 LD

18 m

2017 FK3

Mar 27

9.1 LD

26 m

2017 FV

Apr 2

9.1 LD

60 m

2017 EB3

Apr 4

13.8 LD

43 m

2017 DC38

Apr 5

14.6 LD

54 m

2003 BD44

Apr 18

21.7 LD

1.9 km

2014 JO25

Apr 19

4.6 LD

1.0 km

1999 CU3

Apr 19

63.7 LD

1.9 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


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 cloudstrigger 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.


Current Conditions

Solar wind
speed: 629.4 km/sec
density: 4.9 protons/cm3
more data: ACEDSCOVR
Updated: Today at 1533 UT

X-ray Solar Flares
6-hr max: A6 0759 UT Mar23
24-hr: A9 0712 UT Mar23
explanation | more data
Updated: Today at: 1500 UT


Daily Sun: 23 Mar 17

Sunspot AR2643 poses no threat for strong solar flares. Credit: SDO/HMI


Sunspot number: 12
What is the sunspot number?
Updated 23 Mar 2017

Spotless Days
Current Stretch: 0 days
2017 total: 27 days (34%)
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 23 Mar 2017

The Radio Sun
10.7 cm flux: 73 sfu
explanation | more data
Updated 23 Mar 2017


Current Auroral Oval:


Switch to: EuropeUSANew ZealandAntarctica
Credit: NOAA/Ovation


Planetary K-index
Now: Kp= 1 quiet
24-hr max: Kp= 5 storm
explanation | more data

Interplanetary Mag. Field
Btotal: 7.2 nT
Bz: 1.2 nT north
more data: ACEDSCOVR
Updated: Today at 1533 UT


Coronal Holes: 23 Mar 17

Earth is inside a stream of solar wind flowing form 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 ShelfAntarctic PeninsulaEast AntarcticaPolar

Updated at: 02-24-2017 17:55:02


NOAA Forecasts


Updated at: 2017 Mar 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: activeminor stormsevere storm

Updated at: 2017 Mar 22 2200 UTC


0-24 hr

24-48 hr


35 %

35 %


25 %

15 %


05 %

05 %

High latitudes

0-24 hr

24-48 hr


10 %

10 %


25 %

25 %


60 %

50 %