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Le chiffre officiel est
La faiblesse du cycle actuel ne fait plus de doute...
Metallic photos of the sun by
renowned photographer Greg Piepol bring together the best of art and
science. Buy one or a whole set. They make a stellar gift.
A NASA spacecraft has recorded audio-frequency
radio emissions coming from Earth. Some say the
signals sound like whales; others liken them to
the chirping of prairie dogs. What do you think?
Earth-facing sunspots 1579 and 1582
are so large, sky watchers are noticing them without
the assistance of a solar
telescope. When the low-hanging sun is dimmed
by clouds and haze, the two spots can be seen punctuating
Lauri Kangas took this picture on
the evening of October 2nd from Fort Frances, Ontario.
" The sun was easy to photograph safely without
any protective filters due to the clouds and smoke
from forest fires in northwestern Ontario,"
Although these sunspots are large
(each one is wider than Earth) they are not very
active. Their magnetic canopies contain are simply
organized, containing no unstable structures that
pose a threat for flares. NOAA forecasters say there
is less than a 5% chance of M-flares and a 1% chance
of X-flares today.
Do not look at the sun through
unfiltered optics. Even when the sun is low and
dim, focused sunlight can damage human eyes. When
photographing sunsets, use your camera's LCD screen,
not the optical viewfinder.
Space Weather Photo Gallery
CROSSING THE HARVEST MOON: Two nights
ago, Bill Reyna of Sussex County, New Jersey, went
outside to see the Harvest Moon (the full Moon closest
to the autumnal equinox) when a winged shadow flitted
across the lunar landscape. It was the International
Reyna captured the station's silhouette
backlit by the Sea of Clouds (Mare Nubium) using
a Canon 7D digital camera snapping pictures in HD
video mode. "With the ISS moving at 4.6 miles
per second at a range of 321 miles, it crossed the
lunar disk in only .45 seconds," he says. "I
knew exactly when to video-record the transit thanks
to predictions from Calsky."
ISS flyby alerts:
Aurora Photo Gallery
Noctilucent Cloud Photo Gallery
[previous years: 2003,