Daily Archives: December 6, 2013

The Sun Online and solar activity. December 6, 2013

The GOES X-ray background radiation is at the C-level. Several C-class flares were observed during the past 24h, mainly in NOAA AR 1909 and in the returning regions on the east limb. We expect more C-flares, especially from these east limb regions, with a small chance for an M-class flare. A large scale filament eruption was observed on December 04, starting from 11:00 UT. This resulted in a slow CME, mainly oriented towards the north. Another filament erupted in AR 1909 around 21 UT on December 5th. While there is a gap in LASCO data, COR2-A images clearly show the associated slow CME. The activity on the east limb also resulted in several CMEs towards the SE (as seen from LASCO). We expect unsettled to active conditions (up to K=4) on December 7 due to the arrival of a coronal hole high speed wind stream. This coronal hole, which seems to have increased in size in the last 24h, passed the central
meridian on December 4. Afterwards, geomagnetic conditions should return to quiet conditions until December 9th when Earth may feel the influence from the ICME associated with the filament eruption in AR 1909. A glancing blow from the east limb CMEs is also possible.

Equipment: Coronado 90 + SBIG 8300s + LX75
Processing: Photoshop
Date: 12/06/13
Time UT: 10:00
Exposure 0.8 sec.

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Gamma-Ray Earth and Sky


Image Credit: International Fermi Large Area Telescope Collaboration, NASA, DOE

For an Earth-orbiting gamma-ray telescope, Earth is actually the brightest source of gamma-rays, the most energetic form of light. Gamma-rays from Earth are produced when high energy particles, cosmic rays from space, crash into the atmosphere. While that interaction blocks harmful radiation from reaching the surface, those gamma-rays dominate in this remarkable Earth and sky view from the orbiting Fermi Gamma-ray Space Telescope’s Large Area Telescope. The image was constructed using only observations made when the center of our Milky Way galaxy was near the zenith, directly above the Fermi satellite. The zenith is mapped to the center of the field. The Earth and points near the nadir, directly below the satellite, are mapped to the edges of the field resulting in an Earth and all-sky projection from Fermi’s orbital perspective. The color scheme shows low intensities of gamma-rays as blue and high intensities as yellowish hues on a logarithmic scale. Our fair planet’s brighter gamma-ray glow floods the edges of field, the high intensity yellow ring tracing Earth’s limb.Gamma-ray sources in the sky along the relatively faint Milky Way stretch diagonally across the middle. Launched June 11, 2008 to explore the high-energy Universe, this week Fermi celebrated its 2,000th day in low Earth orbit.

NASA APOD. December, 06 2013

Triangulum Galaxy


The Triangulum Galaxy is a spiral galaxy approximately 3 million light years (ly) from Earth in the constellation Triangulum. It is catalogued as Messier 33 or NGC 598, and is sometimes informally referred to as the Pinwheel Galaxy, a nickname it shares with Messier 101. The Triangulum Galaxy is the third-largest member of the Local Group of galaxies, which includes the Milky Way, the Andromeda Galaxy and about 44 other smaller galaxies. It is one of the most distant permanent objects that can be viewed with the naked eye.

Imaging telescopes or lenses: Takahashi TOA-130
Imaging cameras: Canon EOS 550D / Rebel T2i
Mounts: Takahashi EM-200
Guiding telescopes or lenses: William Optics ZS 66SD
Guiding cameras: QHYCCD QHY5V
Software: DeepSkyStacker, Incanus APT – Astro Photography Tool, photoshop, PHD guiding
Resolution: 1623×1080
Dates: Oct. 19, 2012
Frames: 33×420″ ISO1600

Autor: Ivaylo Stoynov

AstroPhotography of the day by SPONLI
December 06, 2013
We select the best works of amateur astrophotographers with details of equipment, shooting processing etc.