Solar
Activity

Active Region Movies
Movies showing flaring activity associated with active region development.

The images are of magnetograms taken by the HMI instrument on the Solar Dynamic Observatory (SDO) over-plotted with the location of flares. Various routines in SolarSoft, including those developed by the HELIO project, are used to create the images and movies.  

AR No. Dates of Movie Notes
11967 2014/01/27 – 2014/02/10 Very large flare producing active region
12192 2014/11/16 – 2014/10/31 Very large flare producing active region
12209 2014/11/11 – 2014/11/27 Active region with large spot pair that produced few flares. Note how little the magnetic field changes during the transit.
12230 2014/12/04 – 2014/12/18 Small, short-lived active region that produced flares
12242 2014/12/11 – 2014/12/24 Smaller active region that produced flares. Note how the centre of activity shifts as the regions evolves.
 

The centre of the field of view of each image is derived from the location of the active region; this is interpolated from information given in the NOAA/USAF Solar Active Region Summary (included as the noaa_active_region_summary list in the HELIO HEC). The latitude is the average of all values when the region ifs in the list; the longitude is calculated by doing a linear fit to the given longitude (in order to smooth out rounding errors).

The images are created every 6 hours – this is indicated in the bottom left hand corner. The closest available HMI FITS image to this time that can be found in SolarMonitor is used. Flares for the 48 hours leading up to the time are over-plotted; these are rotated to the time of the image.

The locations of the flares over-plotted on the image are derived from the flare catalogue prepared by Lockheed Martin (LMSAL, Palo Alto) and included as the gevloc_sxr_flare list in the HELIO HEC:

  • The size of dot indicated the soft X-ray class of the flare – the smallest are C class, medium size are M class and the largest at X class.
  • The colour of the dot gives a rough indication of when the flare occurred, with respect to the time in the bottom left of the image. Red dots are up to 12 hours before the time indicated; blue dots are 12-24 hours; turquoise dots are 24-48 hours.
 

 

 
Last updated: 1st July 2015

 


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