Daily Archives: April 8, 2014

The Sun Online and solar activity. April 8, 2014

Since our last bulletin, three C-class flares were produced. They all originated from Catania sunspot group 8 (NOAA AR 1926).  The GOES X-ray flux background was at B-class level. A new region emerged
near S03E30. Eruptive flaring activity is expected for the next 48 hours with a slight chance for M-class flares. No Earth bounded CMEs were observed.
Solar wind observations from ACE showed an increase of the solar wind speed at 17h UT of April 7 from 360 to  480 km/s and then a decline to 400 km/s. The magnitude of the interplanetary magnetic field varied between 1 and 11 nT, with a Bz component fluctuating between -10 and 6 nT. The periods with a negative Bz resulted in unsettled to active magnetic conditions (both local K at Dourbes and  NOAA planetary Kp).  So far, there were no clear signatures of arrival of a shock related to the CME of April 4, but it is still possible in the next few hours. Unsettled conditions are expected for the next 48 hours.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 04/08/14
Time UT: 14:00
Exposure 1/500 sec.

Observatory SPONLI


M42: Inside the Orion Nebula


Image Credit: R. Villaverde, Hubble Legacy Archive, NASA

The Great Nebula in Orion, an immense, nearby starbirth region, is probably the most famous of all astronomical nebulas. Here, glowing gas surrounds hot young stars at the edge of an immense interstellarmolecular cloud only 1500 light-years away. In the above deep image composite in assigned colors taken by the Hubble Space Telescope wisps and sheets of dust and gas are particularly evident. The Great Nebula in Orion can be found with the unaided eye near the easily identifiable belt of three stars in the popular constellation Orion. In addition to housing a bright open cluster of stars known as the Trapezium, the Orion Nebulacontains many stellar nurseries. These nurseries contain much hydrogen gas, hot young stars, proplyds, and stellar jets spewing material at high speeds. Also known as M42, the Orion Nebula spans about 40 light years and is located in the same spiral arm of our Galaxy as the Sun.

NASA APOD 08-Apr-14

NGC 7635 in the constellation Cassiopeia


NGC 7635, also called the Bubble Nebula, Sharpless 162, or Caldwell 11, is a H II region emission nebula in the constellation Cassiopeia.

Amateur observation

With an 8 or 10-inch (250 mm) telescope, the nebula is visible as an extremely faint and large shell around the star. The nearby 7th magnitude star on the west hinders observation, but one can view the nebula using averted vision. Using a 16 to 18-inch (460 mm) scope, one can see that the faint nebula is irregular, being elongated in the north south direction.

Imaging telescopes or lenses: GSO Newton 8″ f/5
Imaging cameras: Canon EOS 350D / Digital Rebel XT
Mounts: Sky-Watcher EQ6 Syntreck
Guiding telescopes or lenses: GSO Viewfinder 8X50
Guiding cameras: Orion SSAG
Software: Iris, PHD guiding, photoshop
Filters: Astronomik CLS CCD Filter
Dates: July 22, 2012
Locations: Perigord
Frames: 53×480″
Integration: 7.1 hours

Author: Fredéric Segato

AstroPhotography of the day by SPONLI
8 Abril 2014