R_SMALL_HRES_LCAD_Composition-vs-Height

Proposed SOOP Coordinators

A. Giunta, S. Parenti, D. Berghmans, D. Spadaro, A. Fludra, L. Harra, D. Baker

Description

Mapping the abundance of minor ions as a function of height in the corona to distinguish between slow and fast wind. This will be targeted at the boundary of a streamer, or at an active region on the limb. SPICE-led. Can be run at the limb but also on disk.

Note: The limb version of Composition-vs-Height could be potentially run during NMP Segment 2 or 3 (it would fit best at the end of the October perihelion window, near 0.55AU, such as the last day or two of RSW12 or RSW18).

Default SOOP duration: 3 hrs

POinting requirements: off-pointing close-in / disk-centre farther out

Triggers: disabled

Instrument	Mode	Comment
EUI	HRI observations, e.g. in EUV & LYA Active Region modes (A). Cadence TBD (currently modelled with 360s cadence, i.e. 20.2 kbps)	Context and also higher (than SPICE) cadence observations in order to interpret the SPICE composition map
Metis	One of METIS standard modes before main observations, get coronal context, but will not participate at limb pointing (unless s/c at large heliocentric distance): mode TBD Currently modelled as WIND	Context especially important for streamers
PHI	FDT synoptic data: 1024 x 1024 pixels, at 6 hr cadence I_c, B, γ, φ PHI_synoptic_FDT_4	PHI is needed for context magnetic field, but mainly before or after the SPICE observations as the target will be on the limb!
SPICE (lead)	SPICE Composition Mapping Slit: 6" At larger distances, when possible, use narrow slit (4"), to enhance spatial resolution. Exposure time: 180 s X positions: 60 FoV: 6' (or 4') x 11' Observation time: 3 hours per repeat Nº repeats: depends on target	Lines for SPICE Composition Mapping: – 15 lines (2 profiles+ 13 intensities) Ne VIII 770 Å, Ne VIII 780 Å, Mg IX 706 Å, O II 718 Å, O IV 787 Å, O V 760 Å, O V 761 Å, O VI 1032 Å, O VI 1037 Å, Ne VI 999 Å, Ne VI 1010 Å, Mg VIII 772 Å, Mg VIII 782 Å, C III 977 Å, Fe III 1017 Å ( L_BOTH_HRES_LCAD_CH-Boundary-Expansion assumed to be default.)

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SAP objective	Target	Duration	Opportunity (e.g., orbital requirements, solar cycle phase, quadrature ...)	Operational constraints	Additional comments
1.1.2.3 Abundance of minor ions as a function of height in the corona as indicator of slow or fast wind	Limb active region (incl the edges), or streamer boundary at limb	3.2 hours, twice	Any RSW is okay, but perihelion preferred for the AR case, and >0.55AU is preferred for the streamer case (requires Metis compatibility)		put EUI in at least twice the cadence of SPICE to interpret composition map (and possible aliasing in time)

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