Marianne's Heaven On Earth Aurora Chaser Tours Chasethelighttours.co.uk invites you to join them in their quest to find and photograph the Aurora Borealis. Experience the winter wonderland in the Tromsø Area.
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CHANCE OF STORMS: On Jan. 15th, a magnetic filament in the sun's southern hemisphere exploded. Debris from the blast formed a CME that could sideswipe Earth's magnetic on Jan. 18-19. NOAA forecasters say there is a 45% chance of polar geomagnetic storms when the storm cloud arrives. Arctic sky watchers should be alert for auroras on Monday and Tuesday nights. Aurora alerts: text or voice.
COMET CATALINA CLOSEST APPROACH TO EARTH: Discovered in 2013 by the Catalina Sky Survey, Comet Catalina (C/2013 US10) is making a one-time trip through the inner solar system. It swung around the sun last November and is now making its closest approach to Earth: 67 million miles away on Jan. 17th. Dr. Fritz Helmut Hemmerich sends this picture from Tenerife, Canary Islands:
"This is Comet Catalina (C2013US10) during a cloudy morning session on Jan. 16th," says Hemmerich. "I thought the photo could be useful as a finder chart. As the inset shows, the comet is located near the handle of the Big Dipper."
The 6th magnitude comet is too dim for the naked eye, but it is an easy target for backyard telescopes and digital cameras. In fact, Hemmerich's photo was taken using no telescope, just a Sony A7s camera set at ISO3200 for a 45 second exposure.
This is Comet Catalina's first visit to the inner solar system--and its last. The comet's close encounter with the sun in mid-November has placed it on a slingshot trajectory toward interstellar space. Enjoy it now. Once it recedes from Earth, we may never see it again. Browse the realtime comet gallery for more sightings.
Realtime Comet Photo Gallery
STREET MAPS IN THE SKY: Winter is unfolding around the northern hemisphere and, as temperatures drop, pillars of light are springing up from ground. Urban lights bounce off ice crystals in the air, producing luminous columns that reach into the heavens. Such "light pillars" are a common sight around northern cities in winter. On Jan. 12th, however, Mia Heikkilä looked up from her hometown in Eura, Finland, and saw something uncommon. "There was a street map of Kauttua painted in the sky!" she says. Heikkilä took this picture of the apparition:
"It was an exact reversed light map of Kauttua, Eura, created by light pillars," Heikkilä explains.
Most people see pillars from the side, where they look like luminous towers, but not Heikkilä. She was located inside a nest of pillars rising from the center of town. Looking up, she saw the tips of the pillars tracing the illuminated streets of Kauttua. In fact, the sky map was even better than the printed map Heikkilä used for comparison, because it traced the most recent changes to the cityscape. "Now I call it #LuxEura," she says.
Note: These observations were first published in Tähdet ja avaruus magazine.
Realtime Spaceweather Photo Gallery
Realtime Aurora Photo Gallery
Realtime Meteor 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 Jan. 17, 2016, the network reported 4 fireballs.
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 January 17, 2016 there were 1652 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. Here is the data from our latest flight, Oct. 22nd:
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 |
| ||Web-based high school science course with free enrollment |