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HINODE Operation Plan (HOP)

accepted on

16-jan-2014

 HOP No.

  HOP title

HOP 0246
Hot plasma properties in Active Regions

plan term

　 　

proposer

  name : Testa, Mason, Del Zanna 　  e-mail : ptesta[at]cfa.harvard.edu

contact person in HINODE team

  name : Testa 　  e-mail : ptesta[at]cfa.harvard.edu

 abstract of observational proposal
Objective:
Determination of coronal plasma properties of core of AR: in particular, temperature distribution (high temperature peak, slope, and low T end of distribution at TR temperatures), and Doppler shifts at different temperatures exploiting the large temperature coverage of spectral observations of EIS and IRIS.

Scientific Background:
Determining the properties of coronal plasma (temperature, density, velocity distributions) can provide stringent constraints on the characteristics of the mechanisms of coronal heating (e.g., Klimchuk 2006, Reale 2010, Testa et al. 2012, Tripathi et al. 2012).  of coronal plasma properties of core of AR: in particular, temperature distribution (high temperature peak, slope, and low T end of distribution at TR temperatures), and Doppler shifts.

Coordinated imaging and spectral observations of active regions with Hinode and IRIS will determine the plasma temperature, density and velocity with unprecedented temperature coverage (low TR to corona). IRIS also provides plasma spectral diagnostics at high spatial resolution at transition region temperatures (O IV, Si IV) and coronal temperatures (the FeXII line in the IRIS spectral range is intrinsically weak so we request 30s exposures to be able to get good S/N), and high spatial resolution (0.166”/pix) imaging at transition region and chromospheric temperatures.

 request to SOT
SOT: large SP Fast Map of entire active region

 request to XRT
XRT: 384x384 fov, multifilter XOB for temperature analysis; exposures
    long enough to guarantee good S/N; if possible run 1 filter with
    higher cadence, and the multifilter subroutine every few minutes

 request to EIS
PRY_footpoints_lite (100”x240”, 30s exposures, 2” slit)

 other participating instruments
Request to IRIS: IRIS should run very large 16-step or 64-step sparse rasters, with exposure times of 30 sec, lossless compression, and slit jaw images in the 1400 and 1330 channels, with rotation tracking. Include FeXII (and FeXXI) line in spectral selection (large linelist is appropriate). To ensure overlap between IRIS and EIS, IRIS should be rolled at a 90 deg angle.

Possible OBS: 3810263237, 3810263243

 remarks
The target should be the core of AR. Possibly with hot loops (i.e., bright in AIA 94A) and at or close to disk center.  If possible repeat the same program on the same AR for a solar rotation, for a few hours every day.

Minimum duration of each run should be about 4 hours (i.e., at least 8 full EIS rasters with the above program), avoiding SAA; longer runs are desirable when telemetry allows.

The target coordinates could be chosen either by the Hinode or IRIS planners, depending on the phase of the Hinode planning cycle.  If the SAA-free periods are not used, then coordination between the planners to avoid SAA in both spacecraft is necessary.  IRIS SAA-free times are approximately 11-15 UT and 23 - 04 UT.

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