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MINOR STORM WARNING: NOAA forecasters estimate a 55% chance of minor G1-class geomagnetic storms on Aug. 8th when a high-speed stream of solar wind is expected to contact Earth's magnetic field. High-latitude sky watchers should be alert for auroras. Aurora alerts: text or voice
PERSEID METEOR OUTBURST: Every year in August, Earth passes through a stream of debris from Comet Swift-Tuttle, source of the annual Perseid meteor shower. The shower is beloved by sky watchers. It is rich in fireballs and plays out over a two-week period of warm, starry summer nights.
This year's display is going to be even better than usual. "Our models predict an outburst on Aug. 11-12 with peak rates greater than 200 meteors/hour under ideally dark skies," explains Bill Cooke of NASA's Meteoroid Environment Office. "That's about twice as many Perseids as usual."
Perseids in Aug. 2015, a composite image by Petr Horalek of Kolonica, Slovakia [more]
In ordinary years, Earth grazes the edge of Swift-Tuttle's debris zone. Occasionally, though, Jupiter's gravity tugs the huge network of dust trails closer, and Earth plows through closer to the middle. This appears to be one of those years. Experts at NASA and elsewhere agree that three or more streams are on a collision course with Earth--hence the outburst.
Observing tips: Go outside between midnight and dawn on the morning of Aug. 12th. Allow about 45 minutes for your eyes to adjust to the dark. Lie on your back and look straight up. Perseids can appear anywhere in the sky, but their tails will point back to a single point in the constellation Perseus: sky map. Increased activity may also be seen on the morning of Aug. 13th.
Got clouds? NASA is planning a live broadcast of the Perseid meteor shower overnight on Aug. 11-12 and Aug. 12-13, beginning at 10 p.m. EDT. You can also listen to radar echoes from the Perseids on Space Weather Radio. More webcasts: from Israel, from Alabama.
Realtime Perseid Photo Gallery
PLANETS ALIGN IN THE EVENING SKY: Venus, Mercury, Jupiter, the Moon, Mars and Saturn--they're all aligned in the evening sky this week. Photographer Yuri Beletsky could only fit four of them in this Aug. 6th shot overlooking Santiago, Chile:
"Light pollution is pretty strong in the city, however, the grand planetary alignment looked amazing anyway!" says Beletsky. "It was an unforgettable view over the Chilean capital.
Just outside the field of view of Beletsky's camera, Mars and Saturn could be seen, too. Follow them all in the nights ahead using these sky maps: Aug 7th, 8th, 9th, 10th, 11th.
CAPT. KIRK AT THE EDGE OF SPACE: Where Spock goes, Kirk must follow. To celebrate the 50th Anniversary of Star Trek and to support their crowdfunded research program, the students of Earth to Sky Calculus launched the captain of the Enterprise to the stratosphere on July 27, 2016. Note the moon over Kirk's shoulder in this photo taken 36 km (118,100 ft) above Earth's surface:
You can buy this collector's item for only $129.95 in the in the Earth to Sky Store.
Proceeds from the sale support space weather research. Bobblehead Kirk hitchhiked on a helium balloon payload that carried an array of X-ray/gamma-ray sensors. By launching these sensors 3 or 4 times a month, the students have shown that cosmic rays are intensifying--a trend that affects mountain climbers, air travelers, high-altitude drones, and astronauts on the International Space Station.
Realtime Aurora Photo Gallery
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. 8, 2016, the network reported 64 fireballs.
(49 sporadics, 15 Perseids)
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 8, 2016 there were potentially hazardous asteroids.
Recent & Upcoming Earth-asteroid encounters: 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.
|Asteroid || |
|2016 PQ || |
|2016 OV || |
|2000 DP107 || |
|2004 BO41 || |
|2015 KE || |
|2009 UG || |
| ||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 |
| ||the underlying science of space weather |
| ||Tobi -- Proud Supporter of Space Education! |
| ||a proud supporter of science education and Spaceweather.com |
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