NOAA AR 2157 (Catania number 45) produced numerous C-class flares during the past 24 hours, the strongest of them being the C8.0 flare peaking today at 08:14 UT. This active region has beta-gamma-delta configuration of its photospheric magnetic field, so we expect more flaring activity up to the M-level, mostly from this sunspot group. An isolated X-class flare is possible but unlikely. The C8.0 flare was accompanied by coronal dimmings indicating the eruption of a CME. However, there is no SOHO/LASCO data yet to confirm the CME occurrence. A partial halo CME was detected yesterday first appearing in the LASCO C2 field of view at 19:24 UT. STEREO B EUVI data show that its source region was located on the far side of the Sun (filament eruption around N15E160 as seen from the Earth), so this CME will not have geomagnetic consequences. The solar proton flux is just below the SEP event threshold, so we maintain the warning condition for a proton event. Since around 04:00 UT today, the interplanetary magnetic field (IMF) magnitude is elevated (up to 12 nT) indicating the arrival of an ICME, probably corresponding to the partial halo CME detected on the Sun on September 2. Due to low solar wind speed (around 350 km/s), the geomagnetic conditions remained quiet to unsettled. The IMF now turned northward, so the geomagnetic conditions are quiet and are expected to remain so.
Equipment: Coronado 90 + Imaging Source DMK + LX75
Processing: Photoshop, Avistack 300 frames
Time UT: 16:00
Exposure 1/500 sec.
Image Credit & Copyright: Rogelio Bernal Andreo (Deep Sky Colors)
Like a rainbow at night, a beautiful moonbow shines above the western horizon in this deserted beach scene from Molokai Island, Hawaii, USA, planet Earth. Captured last June 17 in early morning hours, the lights along the horizon are from Honolulu and cities on the island of Oahu some 30 miles away. So where was the Moon? A rainbow is produced by sunlight internally reflected in rain drops from the direction opposite the Sun back toward the observer. As the light passes from air to water and back to air again, longer wavelengths are refracted (bent) less than shorter ones resulting in the separation of colors. And so the moonbow is produced as raindrops reflect moonlight from the direction opposite the Moon. That puts the Moon directly behind the photographer, still low and rising over the eastern horizon, a few days past its full phase.
APOD NASA 06-Sep-14
Messier 81 (also known as NGC 3031 or Bode’s Galaxy) is a spiral galaxy about 12 million light-years away in the constellation Ursa Major. Due to its proximity to Earth, large size and active galactic nucleus (which harbors a 70 million M☉ supermassive black hole), Messier 81 has been studied extensively by professional astronomers. The galaxy’s large size and relatively high brightness also make it a popular target for amateur astronomers.
Imaging telescopes or lenses: TPO 8″ Ritchey–Chrétien
Imaging cameras: SBIG ST-8300M
Mounts: Orion Atlas EQ-G
Guiding cameras: SBIG ST-i Planetary and Guide Camera Mono
Software: DeepSkyStacker, PHD guiding, photoshop, Nebulosity
Filters: Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil
Accessories: SBIG OAG-8300
Dates: Feb. 26, 2014, March 1, 2014, March 9, 2014
Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil: 10×1200″ -20C bin 1×1
Astrodon Tru-Balance Generation 2 E-Series – LRGB 36mm Round Fil: 18×600″ -20C bin 2×2
Astrodon H-alpha 5nm: 11×1800″ -20C bin 1×1
Integration: 11.8 hours
Author: Mike Carroll
AstroPhotography of the day by SPONLI 06 Sep 2014