Daily Archives: August 27, 2014

The Sun Online and solar activity. August 27, 2014

Solar activity has decreased in the past 24 hours. Only a few C-class flares were observed, with NOAA ARs 2146, 2149 and 2151 as source regions. The largest flare was a C5.6 flare, peaking at 23:25 UT on August 26. No Earth-directed CMEs were observed. Flaring activity is expected to continue at the level of C-flares, with a slight chance for an isolated M-class flare. The risk for a proton event has reduced, but for the time being we leave the warning condition due to position of AR 2146 which still has a delta component.Solar wind observations indicate the arrival of an ICME around 0:00 UT of August 27, related to the CMEs of August 22. The magnitude of the magnetic field has smoothly increased from about 5 to 15 nT. The Bz component is southward with values up to -14 nT. Solar wind speed increased from 280 to 320 km/s, while there were only small variations in density and temperature.  Geomagnetic conditions are currently unsettled (local K at Dourbes=3) to active (NOAA Kp=4), which is expect to persist for the next few hours, till quiet conditions return. The potential arrival of the August 25 CMEs might cause active conditions again from the UT afternoon of August 28 onwards.


Milky Way over Yellowstone 

Image Credit & Copyright: Dave Lane

 The Milky Way was not created by an evaporating lake. The colorful pool of water, about 10 meters across, is known as Silex Spring and is located in Yellowstone National Park in Wyoming, USA. Illuminated artificially, the colors are caused by layers of bacteria that grow in the hot spring. Steam rises off the spring, heated by a magma chamber deep underneath known as the Yellowstone hotspot. Unrelated and far in the distance, the central band of our Milky Way Galaxy arches high overhead, a band lit by billions of stars. The above picture is a 16-image panorama taken late last month. If the Yellowstone hotspot causes another supervolcanic eruption as it did 640,000 years ago, a large part of North America would be affected.

APOD NASA 27-Aug-14

M 74 in Pisces

920f1d70b5cc56677eea00ab42c1d5df.1824x0_q100_watermark_watermark_opacity-15_watermark_position-4_watermark_text-Copyright Stefan Westphal
Messier 74 (also known as NGC 628) is a face-on spiral galaxy in the constellation Pisces. It is at a distance of about 32 million light-years away from Earth. The galaxy contains two clearly defined spiral arms and is therefore used as an archetypal example of a Grand Design Spiral Galaxy. The galaxy’s low surface brightness makes it the most difficult Messier object for amateur astronomers to observe. However, the relatively large angular size of the galaxy and the galaxy’s face-on orientation make it an ideal object for professional astronomers who want to study spiral arm structure and spiral density waves. It is estimated that M74 is home to about 100 billion stars.

Imaging telescopes or lenses: Orion Optics UK SPX 250
Imaging cameras: Artemis Atik 383L+
Mounts: Vixen New Atlux + Skysensor 2000
Guiding telescopes or lenses: Orion Optics UK SPX 250
Guiding cameras: M-Gen Guiding Kamera
Focal reducers: GPU Komakorrektor
Software: Fitswork4, Adobe Photoshop CS2, Deep Sky Stacker 3.3.3 Beta 51 DSS DeepSkyStacker
Filters: Baader Planetarium 36mm Luminance, Baader Planetarium 36mm Red, Baader Planetarium 36mm Green, Baader Planetarium 36mm Blue
Accessories: Lacerta MGEN2
Dates: Dec. 29, 2013, Dec. 30, 2013, Dec. 31, 2013, Jan. 1, 2014, Jan. 5, 2014
Locations: Langenweddingen
Baader Planetarium 36mm Blue: 17×600″ -20C bin 1×1
Baader Planetarium 36mm Green: 17×600″ -20C bin 1×1
Baader Planetarium 36mm Luminance: 17×600″ -20C bin 1×1
Baader Planetarium 36mm Red: 17×600″ -20C bin 1×1
Integration: 11.3 hours
Darks: ~14
Flats: ~112

Author: Stefan Westphal
AstroPhotography of the day by SPONLI 27 Aug 2014