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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0127

Post-Eclipse Four-Pointing Observation Sequence

plan term


@ @


 name : Sterling @  e-mail : alphonse.sterling[at]nasa.gov

contact person in HINODE team

 name : Sterling, Imada, Kano @  e-mail : alphonse.sterling[at]nasa.gov

 abstract of observational proposal
The objective for the Hinode observations is to obtain data that will complement ground-based density measurements of the low corona.  The hoped-for objective is to catch a coronal cavity, as density measurements very near the solar limb of cavities are hard to obtain outside of eclipses.  It is not really possible to say for sure beforehand whether there will be a cavity visible during the time of the eclipse, because cavities visible in white light during eclipses may not be visible in EUV or SXR images (this was the case with the eclipse 1 Aug 2008).  So we would like to do four s/c pointings around the limb.  Hopefully we will catch a cavity, but if not we should still be able to have a good data set for coronal densities and complementary information from Hinode.

XRT and EIS observations are crucial.  SOT support is not essential, but can be carried out if there is available telemetry.

 request to SOT
SOT observations are not essential, although at least a few Ca II images for context would be useful. Should SOT have available telemetry, high-cadence Ca II (30 sec or greater) images appropriate for spicule observations can be employed.

 request to XRT
Filters and exposure times: Al-mesh (8 sec)
Al-poly (12 sec)
C-poly (16 sec)
Ti-poly (16 sec)
Al-poly + Ti/poly (23 sec)
thin Be (65 sec)

Compression: DCPM (lossless)
FOV: 768x768
Binning: 2x2
Cadence: 5 min
Objective: DEM analysis of corona
Data/hour: 20 Mb

Note: Long exposure times are requested, but they can be shortened if  bright features exist on the disk and safety of the instrument is an issue.  Cadence can be lengthened to ~10 minutes if necessary for telemetry.

 request to EIS
Study name: gdz_plume1_2_300_50s
Objective: DEM analysis of near-limb corona.
Number of runs: One time at each of four pointings.
EIS window placement: Place window to see as much of the low corona as possible.
FOV: 300"x512"
Run time: 1h05m per study
Data Size: 245 Mb per study

 other participating instruments
If possible, we request that TRACE observe with the same four pointings as Hinode, for the same time periods.  A standard quiet Sun coronal observation sequence would be fine. If an AR is in the vicinity then exposures should of course be modified as needed.

Each pointing requires at least 1 hr 05 min, in order to run the EIS raster. S/C night and SAAs should be avoided as much as possible.

There are two eclipse episodes:
  Event#1: from 00:51UT to 01:08UT, 71.6% at 00:59UT
  Event#2: from 05:02UT to 05:12UT, 29.2% at 05:07UT
I suggest trying to fit in our program two or three times between Events 1 and 2, and once or twice after event two, while avoiding night and SAAs.   (So in total there will be four pointings only, with the EIS raster run once at each pointing.)

Spacecraft pointing:

As close to the limb as possible.  I suggest these positions:


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