HOP 0477

abstract of observational proposal

Main Objective: The science goal is to produce co-temporal (nearly) full-disk composition maps using SPICE and EIS at both transition region and corona. This updated IHOP also aims to combine IRIS to understand the link between chromospheric signatures and composition variations.

Scientific Justification: The full-disk maps provide the opportunity to investigate composition across multiple layers of the sola atmosphere in a variety of features (active regions, quiet Sun, coronal holes) using a range of composition and spectroscopic diagnostics.

request to XRT

We request thin-Be, Al-med and Be-med images to be run once during each EIS raster during the construction of the mosaic. Raster duration is approx. 1 hr 5 min and the mosaic takes ~40 hrs.

The EIS FOV at each position in the mosaic is 498 x 512 therefore we would like to have XRT to cover at least the same FOV. The XRT filters will be used to constrain DEMs for hot/flaring ARs.

request to EIS

STUDY: DHB_007_v3 STUDY ID: 601 RASTER: AbundRaster_v3 SLIT: 2” STEP_SIZE: 6”
EXPOSURE_TIME: 45 s
LINE LIST: FeXI 180.40 CaXV 182.10 FeX 184.33 FeVIII 185.21 FeXII 186.75 FeXI 188.40 CaXVII 192.47 CaXIV 194.10 FeXII 195.12 FeIX 197.86 CaXV 201.05 FeXIII 202.04 FeXIII 203.83 CaXVI 208.50 SXIII 256.48 SiX 258.37 SiX 261.04 FeXVI 262.98 SX 264.30 FeXIV 270.52 SiVII 275.40 MgV 276.30 MgVII 278.40 MgVII 280.39 FeXV 284.16

remarks

Dates:
1. Dates: 2024 March 20-22
2. Minimum numbers of days: 2
3. 2 consecutive days of continuous observation

Time window: ~40 hrs (EIS) starting Mar 20 at 5 UT [end prior to 6 UT on Mar 22] during SPICE mosaic of 48 hr

Refer to coordination page in Additional Instrument Coordination.

Target(s) of interest:
1. Full disk, covering various features. Using 15 spacecraft pointings covering full disk.
2. Not ToO

See HOP 130 for details. The HOP 130 positions are rearranged to ensure a smoother overlap between adjacent positions. David Brooks has software to calculate the pointings/timings so contact him when this version is run.

Previous HOPs:
HOP 0390 - (Andy S. H. To et al 2023 ApJ 948 121; Linking F10.7 cm radio emission with coronal composition.)

HOP 0453 - (Andy S. H. To et al In prep; Previous run of the composition mosaic IHOP; Understanding composition signatures and differences from both EIS and SPICE)

Additional remarks:
The full Sun scan takes around 40 hours. This coincides roughly with Solar Orbiter/SPICE’s composition mosaic SOOP, with a total run-time of ~48 hours. The pointings of this HOP is designed to be identical to HOP 344 which runs semi-regularly. However, we have updated the EIS study to use one with a more comprehensive line list, bigger step size and longer exposure time.