Coordinated observations with the Solar Orbiter (SO) high resolution instruments (PHI, EUI, SPICE) to study the long-term evolution of a tracked active region (AR) during October 29th and 31st, and November 2nd, 3rd, and 6th, 2022. These observations are associated with the R_SMALL_MRES_MCAD_AR-Long-Term SOOP (see link below).
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 with 5 instances of the R_MRES_MCAD_AR_Long_Term SOOP over 5 days. Each of the instances will follow an AR (not necessarily the same target for all of the 5 instances), combining observations by SO and Earth-bound observatories. Each instance of the SOOP has a duration approximately ranging from 9 to 12 hours. The target ARs will be selected at a time when they are visible from both SO and Earth-bound observatories, thus making the combined observation suitable for stereoscopic studies. The scientific rationale behind the HOP is to combine data from different instruments to study the ARs composition and outflows for the science connection with the in-situ instruments on Solar Orbiter. Additionally, possible filament formation and stability, evolution of magnetic helicity in AR, and, possibly, CME triggering are among our goals. The SOOP is planned to take place from October 29th to November 6th, 2022. Details about this specific science SOOP are public and can be found in:
During the above planned SOOP, SO will have an angle with Earth varying from -40 to -27 degrees, and a distance to the Sun increasing from 0.45 AU to 0.56 AU. HRT will take data with an hourly cadence during the whole duration of the SOOP, with a corresponding spatial sampling (at disk centre) varying from 163 km to 202 km. In addition, the EUV instruments on board SO (EUI) will provide synoptic full Sun images (HRI/FSI at 10 minutes cadence during the whole duration of the SOOP and bursts of high cadence and high resolution images (EUI/HRI daily bursts of 30 minutes or 1h 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.
We request Hinode coverage of the target ARs for each of the 5 instances of the SOOP. The target selection of each instance will happen, approximately, three days in advance of the requested co-observations.