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HINODE Operation Plan (HOP)

accepted on

23-feb-2023


 HOP No.

 HOP title

HOP 0452

[SOOPs: Eruption Watch; Composition Mosaic] Cross-calibration of the Solar Orbiter Polarimetric and Helioseismic Imager (SO/PHI)

plan term

2023/03/27-2023/03/29

@ @

proposer

 name : Orozco, Valori, Hirzberger
@  e-mail : orozco[at]iaa.es, valori[at]mps.mpg.de, hirzberger[at]mps.mpg.de

contact person in HINODE team

 name : Savage, Watanabe, De Pontieu @  e-mail : sabrina.savage[at]nasa.gov, watanabe.tetsuya[at]nao.ac.jp, bdp[at]lmsal.com

 abstract of observational proposal
Main Objective: Hinode support request for PHI cross-calibration with Hinode/SP

Scientific Justification: Objective Statement: Perform coordinated observations with the Solar Orbiter PHI (SO/PHI) instrument and the Hinode spectropolarimeter (Hinode/SP) during the 7th Remote Sensing Window (RSW) of the SO science mission phase that will take place between March 22 and April 4, 2023. The main goal of this HOP is to acquire co-spatial and co-temporal SO/PHI and Hinode/SP data to perform a detailed calibration of the SO/PHI instrument, including both telescopes, the full disk telescope (FDT) and the high resolution telescope (HRT). These observations will help us bring the full capabilities of the SO instruments for science, as well as to acquire additional calibration data.

Solar Orbiter (SO) was successfully launched on Feb. 10th, 2020, and is in nominal mission phase since January 1st, 2022. Detailed scientific observations are acquired during the so-called remote sensing windows (RSWs).

SO/PHI provides maps of the vector magnetic field and line-of-sight velocities with two telescopes, the High Resolution Telescope (HRT) and the Full Disk Telescope (FDT). In order to fully test the capabilities of SO/PHI and monitor any possible degradation of the instruments, it is important to complement these observations with the Hinode/SP, as long as such so-observations are possible. Such observations need to be taken while SO is crossing the Sun-Earth line, such that SO/PHI sees the Sun from the same point of view as Hinode. In this way, a full characterization of the imaging and polarimetric properties of the SO/PHI with respect to Hinode/SP is possible. Notice that the next opportunity for co-observations will be in March 2024. After that, SO will leave the ecliptic. Hence, this is the before-last chance to get real co-aligned observations from Earth.

The SO/PHI observations that will be used for cross-calibration will be taken on March 27th and 29th, 2023, when SO is at a distance of about 0.4 au from the Sun, and at less than 2 degrees separation with Earth. At those times, the pixel scale is about 145 km for HRT and 1100 km for FDT.

The SO/PHI-FDT observations will take place during the Solar Orbiter Observation Plan (SOOP) called Eruption_Watch, led by Daniele Spadaro. The SO pointing at this time will be the disk center.
The SO/PHI-HRT observations will take place during the Solar Orbiter Observation Plan (SOOP) called Composition_Mosaic, led by Deb Baker and Andy S.H. To.

As such, the HRT observations will be taken at locations decided by the SOOP coordinators about three days in advance. The pointing for Hinode will be adapted to that decision.

 request to SOT
For the FDT observations on March 27, 2023:
Time interval: 27 March 2023, from 03:10 to 04:00 UT, to be confirmed about two weeks in advance.
Pointing: Active region, possibly close to central meridian
We request two 320"x164" fast maps covering an AR.
For the HRT observations on March 29, 2023:
Time interval: 06:00 UT to 07:00 UT , exact pointing to be provided about three days in advance.
We request a series of repeating 20hx164h normal maps, with as many repeats as telemetry allows spanning the requested 1-hour time interval. Each scan is expected to take about 10 minutes to complete. Gaps in time between scans are OK.

 request to XRT
None

 request to EIS
None

 other participating instruments
IRIS requests: N/A

Additional instrument coordination: Solar Orbiter [SOOPs: Eruption Watch; Composition Mosaic]
https://issues.cosmos.esa.int/solarorbiterwiki/display/SOSP/Solar+Orbiter+Planning+-+for+coordination+with+external+parties

 remarks
Dates: March 27 & 29, 2023.

Time window: It is important to take into account that the above specific times (UT) are still to be confirmed. Exact times of observations will be provided well in advance, probably two weeks before the observations.

Co-observation with FDT [SOOP: Eruption_Watch]
27 March 2023, from 03:10 to 04:00 UT
Co-observation with HRT [SOOP: Composition_Mosaic]
29 March 2023, from 06:00 to 07:00 UT
Target(s) of interest: For HRT observations: same pointing of the SOOP Composition_Mosaic led by Deb Baker and Andy S.H. To. As for previous observations, the pointing will made public via the dedicated SO web page:
https://issues.cosmos.esa.int/solarorbiterwiki/display/SOSP/Solar+Orbiter+Planning+-+for+coordination+with+external+parties

For FDT observations: Active Regions. In detail, the field of view of Hinode/SP should contain a (developed but not decayed) active region, preferably close to central meridian, and anyway not too close to the limb. Since FDT is observing the entire disk in near-co-alignment with Hinode, such a target will be anyway within the FDT field of view.

Previous HOPs: Several successful HOPs have already been run to address the SO/PHI - Hinode- SP cross-calibration.
HOP 0397 was run during commissioning (data has been successfully analyzed and pending for publication) and HOP 0431 that was run during science mission in 2022 (data analysis is ongoing). This HOP is important to continue monitoring and cross-calibrating SO/PHI-FDT to perform detailed studies about the temporal evolution of its performance.

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