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Astronomy News

Comet approaching, CME sideswiping Earth

From: http://spaceweather.com
“COMET CATALINA (C/2013 US10) Robot looks upis making its closest approach to Earth, only 67 million miles away. The beautiful green comet is only barely visible to the naked eye, but it is an easy target for backyard telescopes and digital cameras as it passes through the handle of the Big Dipper.

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
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Visit Spaceweather.com for photos and finder charts.

MINOR STORM WARNING: NOAA forecasters say there is a 45% chance of minor geomagnetic storms on Jan. 19th when a CME is expected to sideswipe Earth’s magnetic field. Aurora alerts are available from http://spaceweathertext.com (text) and http://spaceweatherphone.com (voice).”

Astronomy News

BIG SUNSPOT ERUPTS

From http://spaceweather.com/

After several days of pent-up quiet, big sunspot AR2473 erupted on Dec. 28th (12:49 UT), producing a slow but powerful M1.9-class solar flare. NASA’s Solar Dynamics Observatory recorded the blast’s extreme ultraviolet glow:

Sun
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For more than an hour, UV radiation from the flare bathed the top of Earth’s atmosphere, ionizing atoms and molecules. This, in turn, disrupted the normal propagation of shortwave radio signals on the dayside of our planet. A NOAA blackout map shows the affected area. Ham radio operators, mariners and aviators in South America, Africa and the south Atlantic Ocean may have noticed fades and blackouts of transmissions below 20 MHz.

The slow explosion also produced a coronal mass ejection (CME). Images from the Solar and Heliospheric Obseratory (SOHO) show a ragged, full-halo CME heading almost directly toward Earth.

The storm cloud will likely reach our planet on Dec. 31st, possibly triggering the first geomagnetic storm of the New Year. NOAA analysts are modelling this CME now; stay tuned for refined forecasts later today when they release their storm track.

Sunspot AR2374 has an unstable ‘beta-gamma’ magnetic field that could explode again in the hours ahead. NOAA forecasters estimate a 55% chance of additional M-class flares and a 10% chance of X-flares on Dec. 28th.

Astronomy News, MonSFFA Website

Looking Up! (Post Script)

Space Weather News for Oct. 24, 2015

http://spaceweather.com

3 planets
The morning planet show is a worldwide event. Pictured above is the view from Yading, China (credit: Jeff Dai).

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MORNING SKY SHOW:  Set your alarm for dawn. Venus, Jupiter and Mars are gathering for a three-way close encounter in the early morning sky. Sky maps and observing tips are available on today’s edition of  http://spaceweather.com

From Oct. 25th to Oct. 29th Venus, Jupiter and Mars will fit together inside a circle only 5o wide (sky maps: #1, #2, #3, #4, #5). Super-bright Venus and Jupiter are visible even after the black pre-dawn sky turns cobalt blue. Once you find them, you will have little trouble locating the dimmer red planet Mars.