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Instrument details
Acronym
VELC
Full name
Visible Emission Line Coronagraph
Purpose
VIS imagery and polarimetry of the Corona
Short description
Imaging the corona by internal and external occultation, with polarisation observation. Exploiting three VIS channels: two narrow-band ones centred on the Iron lines at 530.3 and 637.4 nm respecively, that enable inference of magnetic and electric fields in the Corona, and one broadband centred on 580 nm
Background
New development
Scanning Technique
Sun pointing from the L1 libration point. It views the solar corona with occultation of the solar disc.
Resolution
1500 km at Sun surface
Coverage / Cycle
Full solar corona at 1-s rate
Mass
120 kg
Power
130 W
Data Rate
750 kbps
Providing Agency
ISRO
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
≥2021 to ≥2026
Last update:
2020-02-26
Detailed characteristics
Satellites this instrument is flying on
Note: a red tag indicates satellites no longer operational, a
green tag indicates operational satellites, a blue tag indicates
future satellites
Instrument classification
Solar and space environment monitors Solar activity monitor
WIGOS Subcomponents
No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives Solar electric field Solar magnetic field Secondary mission objectives Solar VIS flux Solar coronagraphic image Show all Show fewer
Tentative Evaluation of Measurements
The following list indicates which measurements can typically be
retrieved from this category of instrument. To see a full Gap Analysis by Variable,
click on the respective variable.
Note: table can be sorted by clicking on the column headers
Variable Relevance for measuring this variable Operational limitations Explanation
Solar VIS flux 2 - very high Limited to the solar corona. Moderate dynamic range, solar disc occulted, polarisation capability
Solar magnetic field 4 - fair Limited to the solar corona. Fluxmetry with high spatial resolution, polarimetry exploited, solar disc occulted
Solar electric field 3 - high Limited to the solar corona. Fluxmetry with coarse spatial resolution, polarimetry exploited, corona view included
Solar coronagraphic image 2 - very high No specific limitation. VIS (400-700 nm), observed with occultation
Instrument: VELC