Daily Archives: December 21, 2013

The Sun Online and solar activity. December 21, 2013

Eight C-flares were observed during the past 24 hours, all originating from Catania sunspot region 87 (NOAA AR 1928). NOAA AR 1934 (no Catania number yet) shows some growth.
There were no Earth-directed CME observed.   The probability for C-flares is around 70% and for M-flares around 30%, from NOAA ARs 1928, 1930 and 1934.  An X-flare is possible but unlikely.  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 maximally 6 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: 12/21/13
Time UT: 15:00
Exposure 0.8 sec.

With SPONLI Space is getting closer!


SDO’s Multiwavelength Sun


Image Credit: GSFC Scientific Visualization Studio, SDO, NASA

Today, the solstice is at 17:11 Universal Time, the Sun reaching the southernmost declination in its yearly journey through planet Earth’s sky. The December solstice marks the astronomical beginning of winter in the northern hemisphere and summer in the south. To celebrate, explore this creative visualization of the Sun from visible to extreme ultraviolet wavelengths, using image data from the orbiting Solar Dynamics Observatory(SDO). Against a base image made at a visible wavelengths, the wedge-shaped segments show the solar disk at increasingly shorter ultraviolet and extreme ultraviolet wavelengths. Shown in false-color and rotating in a clockwise direction, the filters decrease in wavelength from 170 nanometers (in pink) through 9.4 nanometers (green). At shorter wavelengths, the altitude and temperature of the regions revealed in the solar atmosphere tend to increase. Bright at visible wavelengths, the solar photosphere looks darker in the ultraviolet, but sunspots glow and bright plasma traces looping magnetic fields. Watch the filters sweep around the solar disk in this animation of SDO’s multiwavelength view of the Sun.

IC 405 and IC 410

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IC 410 (up) and  IC 405 emission/reflection nebulae in the constellation Auriga

Imaging telescopes or lenses: Takahashi FSQ-106 EDXIII Astrograph @f/3,6
Imaging cameras: Starlight Xpress SXVR-H18 mono
Mounts: Takahashi Em200 Temma2M
Guiding telescopes or lenses: Takahashi FSQ-106 EDXIII Astrograph @f/3,6
Guiding cameras: Starlight Xpress Lodestar
Focal reducers: Takahashi Reducer QE 0.73X
Filters: Astrodon OIII 5nm, Astrodon SII 5nm, Astrodon Ha 5nm

Autor: Laurent

21 December 2013

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