Daily Archives: August 19, 2014

The Sun Online and solar activity. August 19, 2014

Solar activity has been low with just two C flares at the start of the reporting period. The largest one was a C1.8 originating from NOAA AR 2147, peaking at 13:55 UT. The other one a C1.2 flare from NOAA AR 2139 peaking at 16:56 UT. No earth directed CME’s have been recorded. Solar activity is expected to remain at similar low levels over the next days. Solar wind conditions were steady and nominal until the arrival of a moderate shock this morning around 6:00 UT. Solar wind speed has increased since then from 290 km/s before the shock to around 380 km/s at present with a peak above 430 km/s in between. Total magnetic field increased from around to 7 nT to around 12nT presently with peaks above 13 nT. Bz was variable, mostly positive but with negative values peaking around -11nT. Temperature and density have also increased. The conditions are likely due to an earlier then expected arrival of the August 15 CME. Geomagnetic conditions remained quiet to unsettled so far (NOAA Kp mostly 1 but reaching K=3 just recently and local K Dourbes at most 2). Under the continued influence of the CME arrival, elevated solar wind conditions and periods of active geomagnetic conditions should be anticipated during the
following day, with minor geomagnetic storm conditions possible. These will settle afterwards to unsettled and quiet to unsettled conditions.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 08/19/14
Time UT: 16:00
Exposure 1/500 sec.

Observatory Sponli


Contrasting Terrains on Comet Churyumov-Gerasimenko 


 Where should Philae land? As ESA’s robotic spacecraft Rosetta circles toward Comet 67P/ Churyumov-Gerasimenko, a decision must eventually be made as to where its mechanical lander should attempt to touch-down. Reaching the comet earlier this month, Rosetta is sending back detailed pictures of the comet’s unusual nucleus from which a smooth landing site will be selected. Pictured above, near the image top, the head of the comet’s nucleus shows rugged grooves, while near the image bottom, the body shows a patch-work of areas sometimes separated by jagged hills. Some of the patch-work areas apparent on both the head and bodyseem to have fields of relatively smooth terrain. In the connecting area called the neck, however, visible across the image center, a relatively large swath of light-colored smooth terrain appears, punctuated occasionally bylarge boulders. Rosetta is scheduled to release Philae toward the dark mountain-sized comet nucleus with an anticipated landing date in November.

APOD NASA 19-Aug-14

Orion Nebula

The Orion Nebula (also known as Messier 42M42, or NGC 1976) is a diffuse nebula situated south of Orion’s Belt in theconstellation of Orion. It is one of the brightest nebulae, and is visible to the naked eye in the night sky. M42 is located at a distance of 1,344 ± 20 light years and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light years across. It has a mass of about 2000 times the mass of the Sun. Older texts frequently refer to the Orion Nebula as the Great Nebula in Orion or the Great Orion Nebula.

Imaging telescopes or lenses: Takahashi TSA 102 f/8
Imaging cameras: Canon EOS 1000D / Rebel XS
Mounts: Takahashi EM-400 Temma2
Guiding telescopes or lenses: Lunatico EZG60
Guiding cameras: QHYCCD QHY5
Software: PHD guiding, PixInsight, Bahtinov Grabber
Filters: Astronomik CLS CCD clip in
Dates: Dec. 26, 2011, Dec. 27, 2011
Astronomik CLS CCD clip in: 18×180″ ISO400
Astronomik CLS CCD clip in: 15×30″ ISO400
Astronomik CLS CCD clip in: 18×60″ ISO400
Astronomik CLS CCD clip in: 10×600″ ISO400
Astronomik CLS CCD clip in: 14×900″ ISO800
Integration: 6.5 hours
Darks: ~20
Flats: ~20
Bias: ~20

Author: Alberto Pisabarro
AstroPhotography of the day by SPONLI 19 Aug 2014