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HINODE Operation Plan (HOP)

accepted on

27-jun-2019


 HOP No.

 HOP title

HOP 0379

Assessing the Solar Open Magnetic Flux from the Surface Up

plan term

2019/09/19-2019/09/23

@ @

proposer

 name : Sun, Jaeggli @  e-mail : xudongs[at]hawaii.edu, sjaeggli[at]nso.edu

contact person in HINODE team

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

 abstract of observational proposal
Main Objective: To characterize the coronal hole (polar or on-disk) photospheric magnetic field properties with the aim to improve the heliospheric open magnetic flux estimate.

Scientific Justification: The heliospheric open magnetic flux (OMF) based on moderate-resolution magnetograms was found to be grossly underestimated compared to in situ observation. Possible explanations include systematics in the spectropolarimetry inference. We propose to observe the coronal hole (CH) photospheric field using Hinode/SP (Fe I 630 nm) in coordination with BBSO/GST (Fe 1.56 ƒÊm). The high spatial/spectral resolution data probing two different heights will allow for a systematic investigation of various systematics (e.g., radial field assumption, stray light, noise), and are expected to improve the OMF estimate. This work is an integral component of a recent NSF grant, in which Hinode and NST data are used to train a PhD student in preparation for the imminent DKIST operation.

 request to SOT
1. For polar CH, SOT-SP FoV 320h x 164h, Pixel size: 0.16h/pix, Binning: 1x1, Single side mode, exposure: 12.8 sec (16 Cycles). This is identical to HOP 0081.

2. For on-disk CH, the configuration is the same. FoV may be reduced to match the CH dimension.

3. Minimum output: one northern polar CH map and one on-disk CH (if available) map.

 request to XRT
None

 request to EIS
None

 other participating instruments
BBSO/GST

 remarks
Dates:
1. September 19 - 23, 2019 (BBSO/GST allocated observing time)
2. Co-temporal observation with GST is desired but not required

Time window:  15:00 - 24:00 UT (BBSO noon at about 19:40 UT)

Target(s) of interest:
1. Polar CH or on-disk CH
2. On-disk CHs will be ToO. Locations can be estimated 1-2 days ahead using SDO data

The polar CH observation is identical to HOP 0081 (expected to run for 1-2 days in early September). Priority should be given to deeper integration over large FoV.

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