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Space Weather Update: 04/11/2016

By, 04/11/2016

AURORAS THIS WEEK? NOAA forecasters say there is a 50% chance of G1-class geomagnetic storms on April 13th when a negative-polarity solar wind stream is expected to hit Earth's magnetic field. High-latitude sky watchers should be alert for auroras. Auroras alerts: text or voice

SOLAR MINIMUM, INTERRUPTED: The sun's headlong plunge into solar minimum has been interrupted by the surprise emergence of a big sunspot. AR2529 doubled in size over the weekend, and the behemoth spot is now being photographed by amateur astronomers around the world. On Saturday, Jean-Pierre Brahic of Uzès, France, took this picture of the swirling maelstrom of magnetic fields at the sunspot's dark core:


As the inset image of Earth shows, the sunspot's core is wide enough to swallow our planet--twice. Fortunately we are 93 million miles away.

NASA's Solar Dynamics Observatory (SDO) is keeping a close eye on this active region. Magnetic fields near the sunspot's core are crackling with minor C-classsolar flares. None of these flares are very strong, but the ensemble of explosions is doing a good job heating the sun's atmosphere above the sunspot. The towering "hot spot" is shown in this extreme ultraviolet image taken by SDO on April 10th:


Despite its large size and state of unrest, AR2529 has not yet launched a significant solar storm. C-class flares are considered to be small. Stronger flares may be in the offing, however, if the sunspot continues to grow in the days ahead. Stay tuned.Solar flare alerts: text or voice

Realtime Space Weather Photo Gallery

EXOTIC GREEN FLASH: Seaside photographers have a special fondness for the sunset. On rare occasions they can catch the elusive green flash--a split-second pulse of verdant light that signals the disappearance of the sun beneath the ocean waves. On April 7th, astronomy professor Jimmy Westlake photographed a green flash as he stood atop Hawaii's Mauna Kea volcano. The flash he saw, however, did not come from the ocean waves. It happened in the clouds:


"The SKY Club from Colorado Mountain College got an emerald surprise," he says. "Several students visually witnessed the green flash while I was photographing it."

"This appears to be a cloud-top flash," says atmospheric optics expert Les Cowley. "They are not fully understood but might be produced by an inversion layeroverlaying the clouds."

Basically, a temperature inversion bends the sun's rays to form a mirage that vertically magnifies the tiny color separation which is always present at the edge of the setting sun. In Westlake's flash, we see not only green, but also yellow, red, and even a wisp of blue. "The intensity of the blue-green flash caught everyone by surprise!" says Westlake.

Realtime Aurora Photo Gallery

Solar Eclipse Photo Gallery

Realtime Comet Photo Gallery
[More about Comet 252P: brightness measurements3D orbitorbital elements]

 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 Apr. 11, 2016, the network reported 2 fireballs.
(2 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 April 11, 2016 there were 1692 potentially hazardous asteroids.

Recent & Upcoming Earth-asteroid encounters:Asteroid


Miss Distance


2002 EB3

Apr 8

55.6 LD

1.2 km

2016 GO134

Apr 8

0.9 LD

15 m

2016 GK134

Apr 9

5.2 LD

15 m

2016 FG39

Apr 10

4.4 LD

21 m

2009 KJ

Apr 10

37.7 LD

1.6 km

2016 FV13

Apr 11

1.8 LD

28 m

2016 GU

Apr 11

2.7 LD

31 m

2005 GR33

Apr 13

7.7 LD

175 m

2016 GC134

Apr 13

9.1 LD

26 m

2016 FL12

Apr 13

9.6 LD

24 m

2016 FS14

Apr 14

13.7 LD

39 m

2016 FL13

Apr 15

9.8 LD

36 m

2008 HU4

Apr 16

4.9 LD

10 m

2016 GM2

Apr 16

12.7 LD

47 m

2016 FY12

Apr 17

5.9 LD

24 m

2016 FN13

Apr 19

13.9 LD

13 m

2016 GC1

Apr 21

8.9 LD

21 m

2016 FH12

Apr 23

7.8 LD

21 m

2016 FY3

Apr 25

6.3 LD

310 m

2001 VG5

Apr 28

52.4 LD

1.8 km

2014 US115

May 1

9.4 LD

52 m

2008 TZ3

May 5

13.1 LD

355 m

2014 JG55

May 8

7.6 LD

7 m

2016 GS2

May 17

3.4 LD

116 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

Situation Report -- Oct. 30, 2015Stratospheric 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, 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. 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.


Current Conditions

Solar wind
speed: 380.6 km/sec
density: 9.4 protons/cm3

explanation | more data
Updated: Today at 1648 UTX-ray Solar Flares
6-hr max: B8
1320 UT Apr11
24-hr: C1 0204 UT Apr11
explanation | more data
Updated: Today at: 1600 UTDaily Sun: 11 Apr 16Growing sunspot AR2529 is crackling with C-class solar flares. Credit: SDO/HMI

Sunspot number: 26
What is the sunspot number?
Updated 11 Apr 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 11 Apr 2016

The Radio Sun
10.7 cm flux: 111 sfu

explanation | more data
Updated 11 Apr 2016

Current Auroral Oval:


Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/OvationPlanetary K-index
Now: Kp= 2 quiet
24-hr max: Kp= 3
explanation | more data
Interplanetary Mag. Field
Btotal: 10.3 nT
Bz: 3.5 nT north

explanation | more data
Updated: Today at 1647 UTCoronal Holes: 11 Apr 16
Solar wind flowing from the indicated coronal hole should reach Earth on April 13-14. Credit: SDO/AIA.Noctilucent Clouds The southern season for noctilucent clouds began on Dec. 13, 2015. It is expected to end in late February or March 2016.


Switch view: Ross Ice Shelf, Antarctic Peninsula, East Antarctica, PolarUpdated at: 02-12-2016 16:55:02

NOAA Forecasts

Updated at: 2016 Apr 10 2200 UTC


0-24 hr

24-48 hr


10 %

10 %


01 %

01 %

Geomagnetic Storms:
Probabilities for significant disturbances in Earth's magnetic field are given for three activity levels: activeminor stormsevere stormUpdated at: 2016 Apr 10 2200 UTCMid-latitudes

0-24 hr

24-48 hr


10 %

15 %


05 %

01 %


01 %

01 %

High latitudes

0-24 hr

24-48 hr


15 %

20 %


15 %

25 %


15 %

20 %