General description

This is a survey of bright points (beacons) with extreme intensities in the transition region, first discovered by SPICE (Fludra et al. 2021). The goal is to detect more of these events for statistical studies, to characterise their evolution and thermal and magnetic properties, and establish the connection to coronal bright points. These measurements will help explain the formation and heating of bright points on small spatial scales, from the transition region to the corona. 

Default SOOP duration: minimum 6 hours, but can be profitably run for up to 12 hours.

Pointing requirements: Any pointing on quiet Sun disk within +/- 30 degrees from disk centre is useful. Larger off-points reduce the spatial resolution and are progressively less useful.

Observations requirement (baseline)


 Medium FOV, medium cadence:

SPICE_Survey, 8 rasters, 6 hours in total. 

  • Slit: 4"
  • Exposure time: 20 s
  • X positions: 128
  • FoV: 8.5' x 11'
  • Observation time: 43.7 min per raster (2622 sec)
  • Nº repeats: 8  (~6 hours)
  • Ideally, run again on a different day, or several hours later on the same day. One run only has been scheduled.

12.1 MiB/raster. Total telemetry = 96.8 MiB


N IV 76.52 (1 window)
Ne VIII 77.0 (1 window)
SV 78.6+O IV 78.7 (1 window)
C III 97.7 (1 window)
Ly-beta 102.5 (spectral binning=2 so it becomes 1 window)
O VI 103.2 (1 window)
CII + O VI 103.7 (2 windows)


 HiRes & Full Disk

 * minimal: 2 hours of HRIEUV and HRILYA at 1 min cadence

* ideal: 4 hours of HRIEUV and HRILYA at 30s cadence


Besides, that there will be the FSI synoptic program:

- 6 hours of FSI174 at 10min cadence

- 6 hours of FSI304 at 60min cadence


Standard observing programme of the day is usually OK.

An ideal scenario would be:

HiRes & Full Disk

PHI_HRT_NOM_0: HRT nominal mode at 1-2 minute cadence for 1-2 hours (same time interval as EUI HRI).

Full disk at 30 min cadence for rest of the time.

Science objectives

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

Operational constraints 

Additional comments
 1.2.1 What mechanisms heat the corona?Quiet Sun6-12 hours, repeated several times on different daysPreferred Sun-Earth line to allow SDO and other near-Earth observatories to participate.  However, Orbiter stand-alone observations are also useful and possible any time.
So far, only one instance on one day has been run

Instances run / planned

LTP06 (run):

8 March 2022  (with IRIS, Hinode EIS and SOT, SDO) (SOOP coordinators: A. Fludra, D. Berghmans, S. Solanki)

LTP09 (planned - not run):

Did not run due to s/c anomaly.

LTP11 (planned):

2023-04-04 (SOOP coordinators: A. Fludra)

Science outcomes

Ref of paper using the SOOP data

Original SOOP proposers

A. Fludra, D. Berghmans, J. Hirzberger

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  1. SOOP ID in SOOP Kitchen = RB3