SOLAR WIND: Solar wind speed: 687.7 km/sec density: 1.4 protons/cm3.
A high-speed stream of solar wind is buffeting Earth's magnetic field, setting the stage for possible geomagnetic activity.
NOAA forecasters estimate a 60% chance of polar geomagnetic storms during the next 24 hours.
TRANSIT OF VENUS:No one reading this will still be alive the next time Venus crosses the sun in 2117. That makes today special. On June 5th at 3:09 pm PDT, the second planet begins its historic 7-hour transit of the solar disk. Observers on parts of all seven continents (map) will witness something like this:
A high-speed stream of solar wind is buffeting Earth's magnetic field, setting the stage for possible geomagnetic activity.
NOAA forecasters estimate a 60% chance of polar geomagnetic storms during the next 24 hours.
TRANSIT OF VENUS:No one reading this will still be alive the next time Venus crosses the sun in 2117. That makes today special. On June 5th at 3:09 pm PDT, the second planet begins its historic 7-hour transit of the solar disk. Observers on parts of all seven continents (map) will witness something like this:
Photo credit: David Finlay of Sydney, Australia (June 8, 2004)
The timing favors observers in the mid-Pacific where the sun is high overhead during the crossing. In the USA, the transit will be at its best around sunset. Creative photographers will have a field day imaging the swollen red sun "punctured" by the circular disk of Venus.
Stay tuned to Spaceweather.com's realtime gallery for constantly updated images of the transit. Another photo-stream of interest comes from the International Space Station where Don Pettit will be the first man in history to photograph a Venus transit from space. There are also many live webcasts of the transit from locations around the world: #1, #2, #3, #4.
Stay tuned to Spaceweather.com's realtime gallery for constantly updated images of the transit. Another photo-stream of interest comes from the International Space Station where Don Pettit will be the first man in history to photograph a Venus transit from space. There are also many live webcasts of the transit from locations around the world: #1, #2, #3, #4.
BEFORE THE TRANSIT: As Venus approaches the sun, it turns its nightside toward Earth. This turning transforms Venus into a rarely-seen thin ring of light. Lorenzo Comolli photographed the phenomenon from Tradate, Italy, on June 4th:
The effect is caused by particles in upper layers of Venus's atmosphere which scatter sunlight around the circumference of the planet. The ring is very difficult to observe, and often only black-belt astrophotographers are able to record the phenomenon.
"This picture was taken while Venus was a scant 2°17' from the sun's center, and it was very difficult to obtain due to the extreme proximity of the solar limb," says Comolli. "Extreme care was due to avoid the sun light entering the telescope. The extension of the crescent to form a nearly complete ring was remarkable on June 4, while nearly invisible on June 2. Another interesting observation is the limb brightening in Venus's southern hemisphere between 50° to 70° latitude. For confirmation, I obtained a second image using a W25 filter (red) that shows the presence of the brightening in the same way."
www.spaceweather.com
"This picture was taken while Venus was a scant 2°17' from the sun's center, and it was very difficult to obtain due to the extreme proximity of the solar limb," says Comolli. "Extreme care was due to avoid the sun light entering the telescope. The extension of the crescent to form a nearly complete ring was remarkable on June 4, while nearly invisible on June 2. Another interesting observation is the limb brightening in Venus's southern hemisphere between 50° to 70° latitude. For confirmation, I obtained a second image using a W25 filter (red) that shows the presence of the brightening in the same way."
www.spaceweather.com
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