HOP 0458

proposer

name :

Castellanos Duran, Peter, Valori, Hirzberger, Parenti

e-mail :

castellanos[at]mps.mpg.de, peter[at]mps.mpg.de, valori[at]mps.mpg.de, hirzberger[at]mps.mpg.de, susanna.parenti[at]universite-paris-saclay.fr

abstract of observational proposal

Main Objective: To characterize of magnetic configuration of the active region by solving the azimuth 180 deg ambiguity using the two-point of view.

Scientific Justification: On April 7, Solar Orbiter will be at an angle of approximately 45 deg with respect to Earth. This coordination provides a unique opportunity to perform stereoscopic observations. In particular, we aim to characterize of magnetic configuration of the active region by solving the azimuth 180 deg ambiguity using the two-point of view.

Stereoscopy observations also allow us to retrieve the 3D velocity field from the photosphere by combining Hinode/SP and SO/PHI and in the higher layers by combining spectroscopy observations taken by Hinode/EIS + IRIS and SO/SPICE.

At the 45° separation angle it would be highly interesting and valuable to do co- observations of the Doppler maps with EIS and SPICE to get the 3D velocity vector from the Doppler shifts of both instruments. Because there is some progress for the correction of the Doppler maps through PSF de-convolution, we are optimistic that this should work. The Doppler calibration between SPICE and EIS on Mar 29 (Hinode request by Hardi Peter) should confirm the crucial data for this.

request to SOT

For Subwindow-1: Two fast-mode 164"x164" scans are requested. The cadence between the scans is not important. Both scans should avoid an SAA.
* The first fast scan should start after and be located as close as possible to 2023-04-06T23:50.
* The second fast scan should start after and be located as close as possible to 2023-04-07T01:20 (approximately the second half of the interval).
For Subwindow-2: As many (minimum 2) normal-mode 123"x123" scans as telemetry allows.
* We request a 123"x123" normal map that overlaps the 30-minute interval between 2023-04-07T04:50 and 2023-04-07T05:20 (PHI's high cadence window), regardless if there is an SAA in this period. The exact start time is preferably after 2023-04-07T04:20 (the start of EUI's high cadence), but it is not a strong constraint.
* Please add at least one additional 123"x123" normal scan(s) right before and/or after the normal scan requested above, but in this case, the SAA's should be avoided. If feasible, and if telemetry allows, please add an additional 123"x123" normal map in the subwindow.

other participating instruments

Additional instrument coordination: Solar Orbiter [SOOP: R_SMALL_HRES_HCAD_RS-burst: RS5_112]
https://issues.cosmos.esa.int/solarorbiterwiki/display/SOSP/Solar+Orbiter+Planning+-+for+coordination+with+external+parties