Solar wind
speed: 534.1 km/sec
density: 2.9 protons/cm3
explanation | more data
Updated: Today at 0944 UT
X-ray Solar Flares
6-hr max: B1
0558 UT Aug25
24-hr: B1
0558 UT Aug25
explanation | more data
Updated: Today at: 0900 UT
Daily Sun: 25 Aug 16
All of these sunspots are magnetically simple and quiet. None poses a threat for strong solar flares. Credit: SDO/HMI

Sunspot number: 43
What is the sunspot number?
Updated 25 Aug 2016

Spotless Days
Current Stretch: 0 days
2016 total: 20 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 25 Aug 2016


The Radio Sun
10.7 cm flux: 78 sfu
explanation | more data
Updated 25 Aug 2016

Current Auroral Oval:
Switch to: Europe, USA, New Zealand, Antarctica
Credit: NOAA/Ovation
Planetary K-index
Now: Kp= 3 quiet
24-hr max: Kp= 4
unsettled
explanation | more data
Interplanetary Mag. Field
Btotal: 4.4 nT
Bz: 1.8 nT north
explanation | more data
Updated: Today at 0945 UT
Coronal Holes: 25 Aug 16

Solar wind flowing from the indicated coronal hole could reach Earth on Aug. 30. 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
SPACE WEATHER
NOAA Forecasts
Updated at: 2016 Aug 24 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: 2016 Aug 24 2200 UTC
Mid-latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
10 %
MINOR
05 %
05 %
SEVERE
01 %
01 %
High latitudes
0-24 hr
24-48 hr
ACTIVE
15 %
15 %
MINOR
20 %
20 %
SEVERE
15 %
15 %
 
Thursday, Aug. 25, 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.

 

QUIET SUN: With no sunspots actively flaring, the sun's X-ray output is flatlining. The quiet is likely to persist. NOAA forecasters say there is no more than a 1% chance of strong flares for the next three days. Solar flare alerts: text or voice

A LOVELY NIGHT IN TASMANIA: A solar wind stream is buffeting Earth's magnetic field, and this is causing auroras to dance around the poles. Jo Malcomson saw them on Aug. 24th from South Arm, Tasmania:

"In the small hours of Wednesday morning, we enjoyed a naked eye glow across the horizon with some beams visible on the camera," says Malcomson, who left the shutter open long enough to capture a swirl of stars behind the auroras. "It was a lovely night."

The lights should subside tonight. NOAA forecasters have lowered the chances of geomagnetic storms on Aug. 24-25 to 15% as Earth begins to exit the solar wind. More images from the waning storm may be found here. Aurora alerts: text or voice

Realtime Aurora Photo Gallery

SPACE WEATHER BALLOON OVER THE ANDES: Spaceweather.com and the students of Earth to Sky Calculus have just released four space weather balloons in less than three days--from Chile, California, Oregon, and Washington. The rapid-fire launches are in support of the Intercontinental Space Weather Balloon Network, which spans 3 countries, two continents, and more than 10,000 miles. A highlight so far is the Chilean launch of Aug 20th. That balloon reached an altitude of 37.4 km (122,700 feet), a record for our 5 year-old ballooning program. Here is the space weather payload soaring over the Andes:

The purpose of our (exhausting) activity is two-fold:

First, it's a giant experiment in atmospheric radiation. Our payloads contain radiation sensors that allow us to measure cosmic rays from deep space. We will find out how this penetrating form of radiation varies around the Americas at altitudes ranging from ground level to the stratosphere. The results will be especially interesting in Chile, where the balloon ascended into the outskirts of the South Atlantic Anomaly, a high radiation zone caused by a weakness in Earth's magnetic field.

Second, we're practicing for Aug. 21, 2017--the date of the Great American Solar Eclipse. One year from now, we will launch more than a dozen balloons into the path of totality to photograph the eclipse from the stratosphere and create a unique movie of the Moon's shadow sweeping across North America. Such an ambitious project requires practice, and we're starting now.

Stay tuned for updates as the launches continue.

Realtime Space Weather Photo Gallery

NASA REGAINS CONTACT WITH LOST SPACECRAFT: In a surprising development, NASA has regained contact with the STEREO-B spacecraft after two years of silence. STEREO-B, which can see the farside of the sun, went quiet in 2014 after mission controllers tested a communications reset procedure. Unfortunately, STEREO-B failed the test. Since then, NASA has regularly attempted to regain contact using the Deep Space Network. On Aug. 21st, they succeeded, managing to receive a downlink carrier for several hours. In the days and weeks ahead, engineers will take steps to assess the health of STEREO-B and return it to service. Solar flare alerts: text or voice


Realtime Noctilucent Cloud 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 Aug. 24, 2016, the network reported 34 fireballs.
(31 sporadics, 3 Northern delta Aquariids)

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 August 25, 2016 there were 1726 potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters:
Asteroid
Date(UT)
Miss Distance
Size
2016 PS26
Aug 25
13.8 LD
33 m
2016 PA40
Aug 29
14.5 LD
54 m
2004 BO41
Sep 7
38.9 LD
1.1 km
2015 KE
Sep 10
14.9 LD
23 m
2009 UG
Sep 30
7.3 LD
101 m
2100 Ra-Shalom
Oct 9
58.3 LD
1.1 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
Situation Report -- Oct. 30, 2015 Stratospheric 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, 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. 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.

  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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Heliophysics
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