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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0372

Characterization of Stokes Profiles at Magnetic Flux Cancellation Sites

plan term


@ @


 name : Kaithakkal @  e-mail : anjali[at]leibniz-kis.de

contact person in HINODE team

 name : DeRosa, Shine @  e-mail : derosa[at]lmsal.com, shine[at]lmsal.com

 abstract of observational proposal
Main Objective:  Evolution of Stokes profiles during magnetic flux cancelation

Scientific Justification: Kubo et al. (2014) investigated asymmetric Stokes V profile along the PIL for one cancelation event and suggested that presence of asymmetry is not related to cancelation. We want to verify this argument. We will study how the profile shape varies before, during, and after flux cancelation by making use of the high spatial and spectral resolution of the observations. Also, we plan to use the linear polarisation profiles, in addition to Stokes V, to determine Doppler velocity, and compare it with that from the Stokes I profile. With this, we can distinguish between the motion of magnetized and non-magnetized plasma. The Doppler velocity values from linear polarisation profiles will give us a hint about the line-of-sight motion of horizontal magnetic fields during cancelation.

 request to SOT
We like to have the following observation mode:sixty slit positions, spatially binned (9 arcsec x 80 arcsec) data with a cadence of about 1 minute; tracking off.

Run for 1 - 3 hours to overlap with IRIS, telemetry permitting.

 request to XRT

 request to EIS

 other participating instruments
IRIS: IRIS co-observation request accepted (OBS-ID is 3600106829).


Dates: April 28 - May 3/GREGOR observation dates; minimum three days are preferred; It is not necessary for observations to be on consecutive days;

Time window: 8:30 - 11:30 UT

Target(s) of interest: Quiet sun at disk center

Previous HOP:
HOP 240; Kaithakkal, et al. 2015, ApJ, 799, 139

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