SOTSP: HOP319 (MMFs) with BBSO + IRIS
2016-08-30T20:40:00 to 2016-08-30T21:46:35
Science Goal: Moving magnetic features in the periphery of sunspots
Program: Normal map 82"x82", Q65/Q75, 1 side
Target: Active Region
xcen=479 ycen=66
Instrument: SOTSP
HOP/JOP: 319
Description:
The proposed coordinated observations aim at understanding the intrinsic nature of moving magnetic features (MMFs) in the periphery of sunspots, trying to discriminate a few possibilities on their origin: 1) They are a part of magnetic flux of sunspots and representing sunspot decay
2) They are propagating kinks or knots in the magnetic lines of force of sunspots
3) They are manifestations of some type of flux emergence in sunspot outer edges
4) They are submerged magnetic flux caused by mass loading or dragged by convection. We plan the joint observations with BBSO/NST, Hinode and IRIS. Our proposal to NST has been already accepted and arranged in the interval of August 25-31. Sunspots with/without well-developed moat and located close to the disk center will be chosen. Infrared spectro-magnetograph observations and spectral images at photosphere and chromosphere will be taken with NST
Vector magnetic fields of MMFs will be obtained for the first time with NST infrared Stokes-polarimetry and Hinode SOT/SP. Hinode observations are decisive in accurate determination of vector magnetic field of MMFs and relevant plasma ejection and heating.
