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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
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. 25, 2016, the network reported 29 fireballs.
(27 sporadics, 2 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]
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. 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 |
These measurements are based on regular space weather balloon flights: learn more.
|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) |
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.
| ||The official U.S. government space weather bureau |
| ||The first place to look for information about sundogs, pillars, rainbows and related phenomena. |
| ||Researchers call it a "Hubble for the sun." SDO is the most advanced solar observatory ever. |
| ||3D views of the sun from NASA's Solar and Terrestrial Relations Observatory |
| ||Realtime and archival images of the Sun from SOHO. |
| ||from the NOAA Space Environment Center |
| ||a proud supporter of science education and Spaceweather.com |
| ||the underlying science of space weather |
| ||Tobi -- Proud Supporter of Space Education! |
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