Daily Archives: December 20, 2013

The Sun Online and solar activity. December 20, 2013

Six C-flares and two M-flares were observed during the past 24 hours. The strongest flare was a M3.5 event taking place at the east limb, from a region that currently is rotating to the front side of the solar disk. There were no Earth-directed CME observed.  The probability for C-flares remains high, around 80%, from NOAA ARs 1917, 1920, 1928, 1930 and a new region at about 40 degrees west of the central meridian. There is a substantial chance (around 60%) for more M-flares, especially from the unnumbered region currently at the east limb.  An X-flare is possible but unlikely.  The proton flux for >10MeV protons, measured by GOES, currently remains well below threshold levels. We are currently in a slow solar wind stream with a solar wind speed of 350 km/s and a magnitude of the interplanetary magnetic field of 5 nT (observed by ACE). Current geomagnetic conditions are quiet to unsettled
(Kp<4) and are expected to remain so during the next 48 hours.

Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 12/20/13
Time UT: 17:00
Exposure 0.8 sec.

With SPONLI Space is getting closer!


Titan’s Land of Lakes


Image Credit: Cassini Radar Mapper, JPL, USGS, ESA, NASA

Saturn’s large moon Titan would be unique in our solar system, the only world with stable liquid lakes and seas on its surface … except for planet Earth of course. Centered on the north pole, this colorized map shows Titan’s bodies of methane and ethane in blue and black, still liquid at frigid surface temperatures of -180 degrees C (-292 degrees F). The map is based on data from the Cassini spacecraft’s radar, taken duringflybys between 2004 and 2013. Roughly heart-shaped, the lake above and right of the pole is Ligeia Mare, the second largest known body of liquid on Titan and larger than Lake Superior on Earth. Just below the north pole is Punga Mare. The sprawling sea below and right of Punga is the (hopefully sleeping) Kraken Mare, Titan’s largest known sea. Above and left of the pole, the moon’s surface is dotted with smaller lakes that range up to 50 kilometers across.

NASA APOD 20-dec-13

The Lagoon Nebula

The Lagoon Nebula (catalogued as Messier 8 or M8, and as NGC 6523) is a giant interstellar cloud in the constellation Sagittarius. It is classified as an emission nebula and as an H II region.

The Lagoon Nebula was discovered by Giovanni Hodierna before 1654 and is one of only two star-forming nebulae faintly visible to the naked eye from mid-northern latitudes. Seen with binoculars, it appears as a distinct oval cloudlike patch with a definite core. A fragile star cluster appears superimposed on it.

Autor: Jean-Marie Locci

20 December 2013

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