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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GEOMAGNETIC STORM: The ongoing geomagnetic storm has intensified to G2-class as Earth moves deeper into a stream of solar wind. The magnetic polarity of the stream is negative--a condition which favors auroras. Arctic sky watchers should be alert for Northern Lights. Aurora alerts: text or voice
ATMOSPHERIC RADIATION EXPERIMENT IN PROGRESS: Today, the students of Earth to Sky Calculus are flying from Los Angeles to Indonesia to observe the March 9th solar eclipse. Among other things, they are carrying a cosmic ray balloon payload with GPS tracking and 4 radiation sensors. This allows them to measure radiation inside the airplane. Scroll past their flight path to learn more about the experiment:
During the trip, the students will be crossing both the Arctic Circle and the equator in the same 24 hour period, allowing them to gather radiation data rapidly over a wide range of latitude. This will build upon their ongoing study of aviation radiation which, before now, has been limited to latitudes in the continental USA.
Radiation inside airplanes comes from deep space. Galactic cosmic rays are accelerated toward our planet by supernova explosions and other violent events in the cosmos. They penetrate the walls of aircraft with ease and have prompted the International Commission on Radiological Protection (ICRP) to classify pilots as occupational radiation workers. Today's experiment will probe how Earth's magnetic field at different latitudes protects pilots and passengers from aviation radiation. Stay tuned for results!
ANTI-CREPUSCULAR RAYS: The sun was setting yesterday in the Sierra Nevada mountains of central California when a fan of shadowy rays sprang up from the horizon. They looked like ordinary sunset rays except for one thing--"the sun was on the opposite side of the sky," says Katharine Allen, who witnessed the display and photographed it while she was walking her dogs:
"What was it?" she asks. The answer: Anti-crepuscular rays.
Behind Allen's back, the setting sun dipped behind some ragged clouds. The edges of those clouds cast shadows--immense tubes of darkness--that arced all the way across the sky to converge on the opposite horizon. Such shadows are called "anti-crepuscular rays."
Anti-crepuscular rays are not rare, but they are delicate and often go unnoticed. The next time you see shadows emerging from the sunset, turn around. There may be something beautiful waiting right behind your back.
Realtime Spaceweather Photo Gallery
DON'T FORGET THE PARTIAL ECLIPSE: Mainstream media attention is focused on next week's total eclipse of the sun. On March 9th, sky watchers in a narrow strip that cuts across Indonesia and the Pacific Ocean can feel the Moon's cool shadow and witness the sun's ghostly corona--a transformative experience. Check out this animated eclipse map created by Larry Koehn of Shadow and Substance:
There more to the eclipse, however, than totality. While millions of people experience totality, a hundred times more will witness a fractional coverage of the sun with many delights of its own. And that's good, because a partial eclipse is total fun.
The first thing to remember about a partial eclipse is don't stare at it. Even the tiniest sliver of sun left uncovered by the Moon can hurt your eyes. Instead, look at the ground. Beneath a leafy tree, you might be surprised to find hundreds of crescent-shaped sunbeams dappling the grass. Overlapping leaves create a natural array of pinhole cameras, each one casting an image of the crescent-sun onto the ground beneath the canopy.
No trees? Try this trick: Criss-cross your fingers waffle-style and let the sun shine through the matrix of holes. You can cast crescent suns on sidewalks, driveways, friends, cats and dogs—you name it. Hand shadows are fun, too, like the crescent-eyed turkey shown above.
The partial eclipse zone covers almost half of the Earth, touching places as far apart as Alaska (20% coverage), Hawaii (65%), Australia (0% to 60%), China (0% to 40%), Japan (20%), and Papua New Guinea (70%). Because the partial eclipse lasts for more than an hour, there is plenty of time for shadow play and photography using safely-filtered telescopes and cameras. The view from Hawaii and Alaska, where the eclipse occurs near sunset, should be especially beautiful.
Realtime Spaceweather Photo Gallery
AURORA SPRING: What are the signs of Spring? They are as familiar as a blooming Daffodil, a songbird at dawn, a surprising shaft of warmth from the afternoon sun. And, oh yes, don't forget the aurora borealis. Spring is aurora season. For reasons not fully understood by scientists, the weeks around equinoxes tend to bring Northern Lights, like these photographed two nights ago by Alan Dyer of Churchill, Manitoba:
"After a week of very quiet and dim auroras, March 3rd brought a fine all-sky display at the Churchill Northern Studies Centre in northern Manitoba," says Dyer. "My photo shows the lights over the boreal forest on the edge of the Arctic tundra on the shore of Hudson Bay."
"The temperature was -25° C," he adds.
That doesn't sound like Spring, but in fact the northern vernal equinox is barely two weeks away (March 20, 2016). At this time of year even a gentle gust of solar wind can spark a bright display. Such a gust, and more, is in the offing. NOAA forecasters estimate a 50% chance of polar geomagnetic storms on March 6th when a negative-polarity solar wind stream arrives in the wake of a CIR (co-rotating interaction region). Aurora alerts: text or voice
Realtime Aurora Photo Gallery
Realtime Comet 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 Mar. 6, 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 March 6, 2016 there were 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 |
| ||the underlying science of space weather |