Daily Archives: October 25, 2014

The Sun online and activity solar.25.10.2014





The strongest flare observed on the Sun during the past 24 hours was the X3.1 flare peaking at 21:41 UT yesterday in the Catania sunspot group 88 (NOAA AR 2192). SOHO/LASCO data demonstrate that the flare was accompanied only with a very weak and narrow CME. No geomagnetic consequences are expected. Despite the decrease in the area of the Catania sunspot group 88, it maintains the beta-gamma-delta configuration of its photospheric magnetic field, so we expect the flaring activity up to X-level from this sunspot group. As the Catania sunspot group 88 is currently situated close to the solar central meridian, a major eruption in this active region may lead to a geoeffective CME and a proton event. A long filament in the northern hemisphere is now crossing the solar central meridian. Its possible eruption may lead to an Earth-directed CME.The Earth is currently inside a slow (around 390 km/s) solar wind flow with average (around 5 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so.

Equipment: Coronado 90 +  Imaging Source DMK  + LX75
Processing: Photoshop, Avistack 300 frames
Date: 25/10/14
Exposure 1/500 sec.

Observatory Sponli



Capella is the brightest star in the constellation Auriga, the sixth brightest in the night sky and the third brightest in the northern celestial hemisphere, after Arcturus and Vega. Its name is derived from the diminutive of the Latin capra “goat”, hence “little goat”. Capella also bears the Bayer designation Alpha Aurigae (often abbreviated to α Aurigae, α Aur or Alpha Aur). Although it appears to be a single star to the naked eye, it is actually a star system of four stars in two binary pairs. The first pair consists of two bright, large type-G giant stars, both with a radius around 10 times that of the Sun and two and a half times its mass, in close orbit around each other. Designated Capella Aa and Capella Ab, these two stars are thought to be cooling and expanding on their way to becoming red giants. The second pair, around 10,000 astronomical units from the first, consists of two faint, small and relatively cool red dwarfs. They are designated Capella H and Capella L. The stars labelled Capella C through to G and I through to K are actually unrelated stars in the same visual field. The Capella system is relatively close, at only 42.2 light-years (12.9 pc) from Earth.

Imaging cameras: Canon EOS 6D (unmodified)
Mounts: Benro B4 ballhead, Benro C2580T
Guiding telescopes or lenses: Sigma 105mm f/2.8 EX DG OS HSM macro
Software: Adobe Lightroom 5, Adobe Photoshop CS2, Hugin Team Hugin 2013
Accessories: AstroTrac TT 320
Resolution: 2000×854
Dates: Oct. 16, 2014
Frames: 20×120″
Integration: 0.7 hours
Avg. Moon age: 22.32 days
Avg. Moon phase: 48.17%
RA center: 80.029 degrees
DEC center: 47.317 degrees
Pixel scale: 20.666 arcsec/pixel
Orientation: -46.603 degrees
Field radius: 6.243 degrees

Аuthor: Ville Miettinen, 25.10.2014

Astrophotography of the day of SPONLI


The Sun online and activity solar.25.10.2014


Catania sunspot group 88 (NOAA AR 2192) continues to grow and maintains the beta-gamma-delta configuration of its photospheric magnetic field. The strongest flare it produced during the past 24 hours was the M4.0 flare peaking at 07:48 UT today. This flare was accompanied only with a narrow CME that is not expected to arrive at the Earth. We expect the flaring activity up to X-level from this sunspot group. As the Catania sunspot group 88 is currently situated close to the solar central meridian, a major eruption in this active region may lead to a geoeffective CME and a proton event. A long filament in the northern hemisphere is approaching the solar central meridian. Its possible eruption may lead to an Earth-directed CME. The Earth is currently inside a slow (around 430 km/s) solar wind flow with average (around 6 nT) interplanetary magnetic field (IMF) magnitude. The geomagnetic conditions are quiet and are expected to remain so, with isolated intervals of active conditions (K = 4) possible but unlikely.