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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0267

The footpoints of sunspot plumes and fan loops

plan term


@ @


 name : Young @  e-mail : pyoung9[at]gmu.edu

contact person in HINODE team

 name : Young @  e-mail : pyoung9[at]gmu.edu

 abstract of observational proposal
Sunspots often show bright fan loops in the AIA 171 channel, and these are clearly seen in upper transition region lines of EIS where they exhibit downflows of 10-40 km/s. Sunspot plumes are identified as redshifted features seen in transition region lines, and are particularly clearly seen in the IRIS O IV lines, which show velocities of 70-100 km/s. Sunspot plumes are usually narrower than fan loops, but are found in the same locations so they may represent one stage in the evolution of the strands that compose fan loops.

This IHOP will take coordinated observations between Hinode and IRIS to investigate the relationship between sunspot plumes and fan loops.

A sunspot with strong fan loops as seen in the AIA 171 channel is the preferred target. The centers of the IRIS and EIS rasters should be placed at the footpoints of one of the fan loop groups.

A duration of 4 hours is requested in order to monitor the evolution of the plume and fan loop structures.

 request to SOT
Na I magnetograms and Ca II at full spatial resolution and 1-2 minute cadence. Occasional G-band image. Field-of-view at least 40" x 40".

 request to XRT
Use a low temperature filter (e.g., Al-poly) and a hotter filter (e.g., Be-thin). Field of view should be 256x256 and the full spatial resolution should be used. Cadence should be 1 minute or better in each filter. The expected structures will be faint, so long exposures are needed.

 request to EIS
Repeat the study Cool_loop_narrow to fill the available time slot. The study must be centered on the same location as IRIS.

Begin and end the sequence with a single run of PRY_slot_context_v3 (ID 353).

 other participating instruments
Request to IRIS
OBSID: 3820258690 - large dense 64-step raster (20.8x120, 64 steps) with 8 second exposure times. Medium linelist. x2 FUV spectral binning.

Si IV slitjaw images with occasional Mg II w slitjaw images. For example, 48 Si IV images and 16 Mg II w images per raster.


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