R_BOTH_HRES_LCAD_Dark-Halos

General description

The idea is to take 2 separated campaigns targeting a big active region, young enough to last several days, to cover 2 different scientific objectives:

• The first campaign would be in conjunction with the Earth to address the scientific objective: “How the Dark Halos observed in the transition region and corona are related to each other”
  -Without METIS
  -Coordination with Earth instruments (IRIS, Hinode/EIS) is crucial for the scientific objective
  -Ideally, since Dark Halos are wide, a mosaic of the targeted region is needed. The number of different pointings would depend on the size of the target, ~ 3 can be a reasonable number. However, it is -OK even if more than one pointing is not possible.
  -EUI: observing mode of R_SMALL_HRES_HCAD_Atmospheric_Dynamics_Structure
  -PHI: it is sufficient to provide 3 magnetograms, one right at the start of the SPICE scan, one in the middle and one at the end; however, observing mode of R_SMALL_HRES_HCAD_Atmospheric_Dynamics_Structure is OK
  - SPICE: observing mode of L_SMALL_MRES_MCAD_Composition-Mosaic

 

• The second campaign would target the same active region, but at the limb, i.e. some days later or before,  to address the scientific objective: “What are the effects of dark holes in the corona? What are their relations to the fast/slow wind?”. Preferences are given to ~8 days after the 1st campaign.
  -Led by METIS
  -The CH Boundary Expansion SOOP can be directly recycled and adopted.
  -It is preferable to run it after conjunction and not before, to be sure of the nature of the target (i. e. not to confuse it with a coronal hole)

For scientific reference, see Lezzi et al. 2023

Default SOOP duration: 1st campaign dictated by the number of SPICE mosaics. When the minimum is required (3 pointings), this gives ~15 hours. The 2nd campaign ~5hours

Pointing requirements: Point_Feature for an Active region, followed by a Point_Limb

Triggers: none

Observations requirement (baseline)

Data acquisition 1

 

Data acquisition 2

 

 

Science objectives

The goal of the SOOP is to acquire above-the-limb observations of the source region of the solar wind plasma that will be later sampled in situ by Parker Solar Probe. This goal is closely linked to the main science objective of Solar Orbiter, i.e. the science of connecting solar and heliospheric phenomena. Correlating solar wind properties measured in situ by Parker Solar Probe with the properties of the coronal plasma measured by remote-sensing instruments aboard Solar Orbiter can be well done during a quadrature, when Parker Solar Probe passes above a limb observed by Solar Orbiter. Off-pointing to a limb allows SPICE and EUI to acquire high-cadence observations of the solar wind source region, which can provide data on plasma densities, temperatures, composition, Doppler shifts, and small-scale coronal dynamics.

 

Instances run / planned

 

Science outcomes

 

Original SOOP proposers

Vincenzo Andretta, Serena Lezzi