Saturday, 30 July 2016

AR12565 and 67: Odd Couple


Two spot groups unusually close together. A fine prominence was seen at the limb on Jul22 with AR’s 12565 and 12567 still 20° from the limb. That prominence was likely the filament recorded 20°W of the groups during their disc transit. While very bright plage was seen sandwiched between the two dominant (p) spots and some arf – no flares were logged; flaring was then steady at GOES B2.

More M-flares! A gale cut short the Jul22/23 session, but M5 and M7 flares erupted just 2hrs and 5hrs later! The latter, a twin peaked event, hosted a rare spray of ejecta, apparently from AR12565(Fig SDO log). The spot duo had attained high activity levels while rounding the limb. A 3hr patrol on Jul23/24 with the duo on the W limb only showed plage, some surges, arf and fragments of a flare loop; but an M2 flare erupted just 4hr later at local sunset, again unseen! 
(Zirin, H "Astrophysics of the Sun" (1986) defines a spray as "the ejecta of flares...spray velocities can be huge, up ro 2000km/sec" . . " as from the muzzle of a gun" p270, 280 298 etc)

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