HOP 0442

abstract of observational proposal

Main Objective:
Coordinated observations with the Solar Orbiter (SO) Polarimetric and Helioseismic Imager (PHI) High-Resolution Telescope (HRT) for the long-term evolution of a tracked active region (AR) will take place from 17th to 26th October 2022. These observations are associated with the R_SMALL_MRES_MCAD_AR-Long-Term SOOP (see link below).

Scientific Justification:
SO was successfully launched on Feb. 10th, 2020, the nominal mission phase started on Jan 1st, 2022. All its onboard instruments are performing nominally and were commissioned during the early phase of the mission. Among them, SO/PHI provides maps of the vector magnetic field and line-of-sight velocities with two telescopes (Full Disk Telescope, FDT, and HRT); SPICE is the UV spectrometer and EUI/HRIEUV is the coronal high cadence/spatial resolution imager which provide transition region and coronal plasma parameters.

Scientific goal: The proposed HOP is planned to run in parallel to the R_MRES_MCAD_AR_Long_Term SOOP that will combine observations by SO and Earth-bound observatories to follow one AR for as long as possible. The AR will be selected from low-latency data when SO is behind the Sun. Depending on where the AR is located, the combined coverage can be in excess of two weeks, thus providing the data for one of the major scientific goals of SO: the combined data will be used to study the formation and decay of the target AR, ongoing processes of filament formation and stability, the evolution of magnetic helicity in the AR, and, possibly, CME triggering, in a continuous manner for an unprecedented span of time. The SOOP is planned to take place from 17th to 26th October 2022. Details about this specific science SOOP are public and can be found in:
https://issues.cosmos.esa.int/solarorbiterwiki/display/SOSP/R_SMALL_MRES_MCAD_AR-Long-Term

During the above planned SOOP, SO is moving from East-quadrature towards Earth, with angles with respect to Earth varying from -86 to -47 degrees (over the ten days of co-observation). The distance to the Sun in the same time frame will increase from 0.31 AU to 0.41 AU. SO/PHI-HRT will take data with hourly cadence during the whole duration of the SOOP, with a corresponding spatial sampling (at disk centre) varying from 112 km to 148 km. The SO/PHI-HRT observations will take place at every full hour, from 2022/10/17 at 00:00UT to 2022/10/26 23:59 UT. In addition, the EUV instruments on board SO (EUI and FSI) will also provide continuous coverage with a mixture of low- and high-resolution modes: HRI FSI will be continuously monitoring at 10 minutes cadence during the whole duration of the SOOP; HRI EUI will operate in daily bursts of 30 minutes at 5 sec cadence for the whole duration of the SOOP.The SPICE UV spectrometer will run a combination of high cadence and composition studies.

request to SOT

For SO+Hinode co-observation interval (2022/10/17 to 2022/10/27): we request two fast maps,
320”x164”, with the first starting at 06:40 UT on 2022/10/17, at 13:40 UT on 2022/10/18, and at 18:40 UT from 2022/10/19 to 2022/10/26; and the second starting at 08:40 UT for all days.
For the period following the end of the SOOP (2022/10/28 to 2022/11/2, or whenever the target AR reaches the limb as seen from Earth): we request two fast maps, 320”x164”, starting at 08:40 UT and 18:40 UT.
The above are intended as starting times of SP observations. Notice that, in the above, we considered one-hour duration for the SP scan of 320” width, and that the AR will be at the centre of the FoV, resulting in SP starting to observe 20 minutes earlier than the corresponding PHI observation of the same time.
Adjustments might be necessary.
Telemetry requirement is expected to be 600 Mbits for each map. In the case of telemetry conflict with other HOPs, we would
1) Accept a reduced width of the field of view, as long as the AR is contained within the FoV and the time of SP scans overlap with the corresponding time of PHI-HRT observations given in “Target of Interest”
2) Prioritize later dates in the SO+Hinode co-observation interval and in the days following the end of the SOOP (2022/10/28 to 2022/11/2, or whenever the target AR reaches the limb as seen from Earth) over earlier ones.

(edited on 2022.10.13)

request to XRT

XRT requests:
On each day of the SOOP, from 2022/10/17 to 2022/10/26, we would like to run the Al/poly at 30s cadence (or less) once a day, during the the high cadence of EUI/HRIs, which are
from 07:00 to 07:30 on 2022/10/17;
from 14:00 to 14:30 on 2022/10/18;
from 19:00 to 20:00 on 2022/10/19, 2022/10/20 and 2022/10/21
from 19:00 to 19:30 on the remaining days of the SOOP from 2022/10/22 to 2022/10/26;
Outside of these times, we would like to run the same filter at 1 min cadence for the rest of the observing slot. The same raster can be applied in the days following the end of the SOOP (2022/10/28 to 2022/11/2, or whenever the target AR reaches the limb as seen from Earth); timing can be adapted to needs; timing
can be adapted to needs.

request to EIS

EIS in parallel with ‘SPICE_COMPOSITION’ study:
o Run 1 ID 600 (DHB_007v2) followed by 2 runs of ID 381 (YKK_ARabund01).
Do not run 1 YKK_ARabund01 alone.
o If we need to reduce the TM: run 1 ID 600 (DHB_007v2)
・ October 16th 23:25 - 17th 06:59 UT
・ October 19th 05:00 - 07:39 UT
・ October 26th 03:50 - 10:20 UT
o 1 Run ID 600 (DHB_007v2) or more depending on the TM:
・ October 18th 03:10 - 07:00 UT
・ October 20th 03:10 - 07:00 UT
・ October 20th 23:15 - 21st 03:07 UT
・ October 22nd 03:20 - 07:55UT If enough TM only.
・ October 22nd 21:00 - 23st 00:47 UT.
・ October 23rd 19:55 - 23:10 UT. If enough TM run also YKK_ARabund01.
・ October 24th 23:20 - 25st 02:35 UT
・ October 25th 19:54 - 25st 23:09 UT
・ October 29th
・ November 1st
・ November 2nd
・ November 3rd
・ November 6th

EIS in parallel with ‘SPICE_DYNAMICS’ study: Be sure that the run is within the high cadence slot time of EUI/HRIEV (see https://docs.google.com/spreadsheets/d/120XJuJ8ZQv8Aj1bH_9WUuwHfSKXX2tgdRpuYf-cVPOs/edit#gid=1607350597). EIS study: raster ID 495EIS_HH_frare_raster_v5
o October 17th 07:00 - 24:00 UT. Priority given to cover earlier than 23:03UT.
o EUI high cadence 2022-10-17 07:00 - 2022-10-17 07:30 UT
o October 18th 07:55 - 24:00 UT. If enough TM, start 1h earlier.
o EUI high cadence 2022-10-18 14:00 - 2022-10-18 14:30
o October 19th 07:40 - 24:00 UT. Priority given to cover earlier than 23:00UT.
o EUI high cadence 2022-10-19 19:00 - 2022-10-19 20:00
o October 20th 08:00 - 23:05 UT. If enough TM, start 1h earlier.
o EUI high cadence 2022-10-20 19:05 - 2022-10-20 20:05
o October 21th 07:55 - 24:00 UT. Priority given to cover earlier than 23:00UT. If enough TM start at 03:10UT.
o EUI high cadence 2022-10-21 19:05 - 2022-10-21 20:05
o October 22nd 08:00 - 20:46 UT.
o EUI high cadence 2022-10-22 19:05 - 2022-10-22 19:35
o October 23nd 06:30 - 19:51 UT. If enough TM, start earlier. Priority to the extra composition after 23 UT (see above).
o EUI high cadence 2022-10-23 19:05 - 2022-10-23 19:35
o October 24th. 08:00 - 22:19 UT. If enough TM start earlier (after 03:15 UT).
o EUI high cadence 2022-10-24 19:05 - 2022-10-24 19:35
o October 25th. 07:10 - 19:50 UT.
o EUI high cadence 2022-10-25 19:05 - 2022-10-25 19:35
o October 26th. 10:20 - 23:06 UT.
o EUI high cadence 2022-10-26 19:05 - 2022-10-26 19:35
o October 29th. Priority starting after 23:30 October 31st
o October 31st
o November 2nd. Priority given to cover earlier than 22:34 UT.
o November 3rd. Priority given to cover earlier than 22:30 UT.
o November 6th. Priority given to cover earlier than 08:21 UT.

remarks

Solar Orbiter/SPICE/EUI detailed planning and other useful information for the coordination: https://docs.google.com/spreadsheets/d/120XJuJ8ZQv8Aj1bH_9WUuwHfSKXX2tgdRpuYf-cVPOs/edit#gid=1607350597 This includes the pointing coordinates as seen from Earth.

Target: At the beginning of the sequence, priority will be given to a structure on the east quadrants, as seen from Solar Orbiter. This means east limb or close to the limb as seen from Earth.

When on the disk, tracking mode ON. For limb observations, this will to be confirmed.

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Dates: We request support for scientific activities during the SO PHI/EUI/SPICE high-resolution observations:
From approximately 2022/10/17 (start of the SOOP) to 2022/11/2 (last day that an AR is on disk as viewed from Earth, if it were at -135 degrees for SO on 2022/10/17). The actual interval will be adapted after target selection. On each day of the requested interval the same set of observations for SOT, EIS, and XRT are requested. The AR should be tracked for the whole duration of the HOP, if feasible.

The exact start and end of the requested Hinode coverage will be known after the target selection, which will happen on 2022/10/12 on a preliminary base, and confirmed in the following days until 2022/10/16 (last pointing update possibility for SO). It is understood that any updates communicated to Hinode between 2022/10/12 and 2022/10/16 may not be implemented until 2022/10/18 due to the Hinode upload schedule.

Time window: Various times; see instrument-specific instructions below.

Target(s) of interest: SO will point at an AR, which will be identified, likely, three days in advance of the first observation on October 17th. The same AR is expected to be tracked during the whole duration of required co-observation.
For reference, the SO position on the relevant days is (Ecliptic longitude and latitude distance from Earth in degrees)
2022/10/17: -86.84, 1.38
2022/10/27: -47.55, 6.76

Previous HOPs:
HOPS 432 and 433: SO-PHI/Hinode-SOT cross-calibration data, which are still processed. No paper was yet published.

Additional remarks:
Tracking pointing ON.
Pointing requires special coordination between SO and Hinode teams. The exact pointing coordinates (AR) will be provided about three days in advance of the requested Hinode observation.