General description

This SOOP is aimed at observing structures in the outer corona and linking them to the heliosphere observed in-situ. Metis and SoloHI are leading this SOOP, while IS payload provides continuous observations. Synoptic support from other full disk RS instruments. Disk centre pointing preferred.

At high latitude:

This SOOP could be used as a whole- or half-orbit synoptic campaign that scans the Sun from one high latitude to the other (therefore mainly to be used later in the NMP at min inclination of 15º, i.e. orbit 3 or later). Close to the higher latitude windows, we get a radial sweep at nearly constant latitude for in-situ.

Default SOOP duration: 1 day

Pointing requirements: disk centre

Triggers: only IS triggers active

See SOOP 5 defined for SOWG8 planning exercise.

(SOOP will be modelled with 1 day duration, can be repeated as many times as needed)

Observations requirement (baseline)

SoloHI combination of high cadence TURB and synoptic mode (model as HI_SYN_NEAR for now)disk center or stable pointing required

Generic program like WIND (METIS standard modes) interleaved with FLUCTS (METIS special modes) (FLUCTS runs 1 hr/day)

At high latitude: 

One of METIS standard modes to observe large scale coronalstructures: GLOBAL or LT-CONFIG
+ CMEOBS whenever a CME is triggered

Model: LTCONFIG (cadence 20mins) and 3 x 1 hour CMEOBS

disk centre pointing preferred

CME Watch On
could do a slight offpoint without switching metis off, e.g. to poles during RSW1+3 


FDT synoptic: PHI_synoptic_FDT_4

PHI may be processing in between observations. all data gets downloaded

at higher latitudes, point to the poles for polar magnetic field observations.

EUIFSI synoptic: FSI Synoptic mode (S)all generated data gets downloaded
EPDNormal Mode
MAGNormal Mode
RPWDetection ModeBurst Triggers Active
SWANormal Mode


SPICE currently proposes to use either SPICE Limb mode or SPICE Dynamics, depending on requirement for Metis-compatibility

Limb target (not Metis-Compatible; SPICE Limb mode) :

  • Slit: 4"
  • Exposure time: 5 s
  • X positions: 224
  • FoV: 15' x 11'
  • Nº repeats: 10
  • Observation time:
    • 18 mins per study
    • 3.2 hours total.

Active region, if before or after Metis observatiosn (SPICE Dynamics) :

  • Slit: 4"
  • Exposure time: 60 s
  • X positions: 128
  • FoV: 8.5' x 11'
  • Nº repeats: 1?
  • Observation time: 2.1 hours

At high latitude: 

SPICE Composition Mapping raster followed by multiple instances of SPICE CME Watch

  • Limb active region target best if present. Cannot participate if Metis is observing

Lines for SPICE Limb mode:

  • H I 1025 Å,

  • C III 977 Å,

  • O VI 1032 Å,

  • Ne VIII 770 Å,

  • Mg IX 706 Å,

  • Si XII 520 Å (2nd order) 

– 3 profiles and 3 intensities.

Lines for SPICE Dynamics:

  • 4 profiles and 6 intensities.

SPICE contribution is important for the measurements of line profiles, whose broadening can be considered a signature of the presence of waves in the atmosphere. SPICE observations near the limb can be carried out soon before and after those of Metis.

SPICE scans many latitudes during the SOOP : large swath around the sun

magnetic field spiral less curved at higher latitudes:
SPICE naturally closer to connection point

Use observation called SPICE_CME_COMP in modelling.

Science objectives

SAP objectiveTargetDurationOpportunity
(e.g., orbital requirements, solar cycle phase, quadrature ...)

Operational constraints 

Additional comments Trace streamer blobs and other structures through the outer corona and the heliosphere.Corona + HeliosphereA few DaysQuadrature with Earth for combining SO RS with L1 IS and Earth Coronagraphs with SO ISMetis compatibleQuadrature or radial alignment with SPP would be a bonus How does the Sun's magnetic field link into space?

1.3.2 How is turbulent energy dissipated and how does turbulence evolve within the heliosphere?Corona + HeliosphereStatisticsRadial Alignment with anything else.Metis compatibleRadial alignment with SPP would be a bonus Structure and evolution of streamersCorona + HeliosphereStatisticsQuadrature with Earth for combining SO RS with L1 IS and Earth Coronagraphs with SO ISMetis compatibleSPICE participates if possible. CME evolution

2.2.1 How do CMEs contribute to the global evolution of magnetic flux in the heliosphere?

2.2.2 What is the role of ICMEs in the Sun’s magnetic cycle?

2.3.1 Coronal shocksCorona + HeliosphereStatistics

Near perihelion for highest spatial resolution and best spatial coverage in the corona

Earth side for radio obs from ground and magnetic field models for help with post facto analysis

Metis compatible Quadrature with SPP would be a bonus Understand coronal conditions under which the shocks form and determine the interplanetary conditions where they evolveCorona + HeliosphereStatistics

Near perihelion for highest spatial resolution and best spatial coverage in the corona

Earth side for radio obs from ground and magnetic field models for help with post facto analysis

Metis compatible

Quadrature with SPP would be a bonus Study heating and dissipation mechanisms at shocks with radial distanceCorona + HeliosphereStatistics Close to perihelion

Metis compatible

EMC quiet

Burst modes most important here

Metis needs to see within 5RS for Lyα Identify mechanisms that heat the thermal solar wind particle populations near shocks and determine their energy partitionCorona + HeliosphereStatisticsGood alignment with SPP (Radial or Quadrature) would be beneficial

EMC quiet

Metis not strictly needed for this one but could still provide useful context.
4.2 What are the properties of the magnetic field at high solar latitudes?

Instances run / planned


2022-03-22 to 30 (SOOP coordinators: D. Spadaro + A. Vourlidas)


2022-10-08 to 12 (SOOP coordinators: D. Spadaro)


2023-04-06 to 09 (SOOP coordinators: D. Spadaro)

2023-04-20 (SOOP coordinators: D. Spadaro)

Science outcomes

Telloni D., et al., Observation of a magnetic switchback in the solar corona,  ApJL, 936, L25, 2022

Original SOOP proposers

Vincenzo Andretta, Daniele Spadaro, Angelos Vourlidas

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  1. SOOP ID in SOOP Kitchen = LF1