Home » Solar Instruments » STEREO/SECCHI/HI
PI Instrument And Archive
since 2007
http://virtualsolar.org/ or http://www.ukssdc.rl.ac.uk/solar/stereo/data.html
Solar Instruments
The STEREO Heliospheric Imager consists of 2 detectors, imaging along the Sun-Earth line in white-light. There is a STEREO/HI manifested on each of the two STEREO spacecraft.
Richard Harrison
Rutherford Appleton Laboratory
Chris Davis
Rutherford Appleton Laboratory
Space Science & Technology Department Rutherford Appleton Laboratory Chilton Oxfordshire OX11 0QX
+44 (0)1235 446710
Spectral Rangewhite light
Spectral Resolutionbroadband
Spatial Coverage and ResolutionHI-1 20 deg FOV centered 14 deg from Sun, HI-2 70 deg FOV centered 58 deg from Sun
Temporal Resolution40 minutes (HI1) 120 minutes (HI2)
Data Accuracy
Data PrecisionPixel size 70" and 4' for the HI1 and HI2 cameras respectively
Physical Observablesscattered photospheric light, stars, comets, asteroids.
Derived Outputsdensity in heliosphere; CME topology, evolution and propagation; later in mission, 3D CME structure; cometary, asteroid and planetary observations
Concurrence Opportunities
Expected Lifetime2 year mission now extended to 2011
Location or OrbitSTEREO spacecraft ahead and behind Earth in near-1 AU orbits - drifting 22.5 deg away from Earth per year.
Capability Summaryeach STEREO/HI instrument is a pair of wide-field cameras looking along the Sun-Earth line. Designed to measure the light scattered from Coronal Mass Ejections, they also image the F-corona, comets, asteroids and stars down to 14th magnitude. In addition, a record is kept of cosmic ray tracks scrubbed from the images at a 12-20 second resolution.
SchedulingSynoptic operations. HI1 takes 36 40 minute exposures per day, HI2 takes 12 2 hour exposires per day.
Archival DataFITS files archived at RAL data centre.
Number of Users> 10 groups
Planned UpgradesNone
Sub-InstrumentsEach HI instrument consists of two wide-field cameras; HI1 and HI2. HI1 has a 20 degree field of view centred 13.5 degrees from sun-centre while HI2 has a 70 degree field of view centred 53.5 degrees from sun centre, imaging along the ecliptic.
Data Productsimages
University FacilityNo
National Ground BasedNo
Virtual ArchiveNo
NASA Solar Terrestrial Relations Observatory (STEREO) mission Heliospheric Imager Socker, D.G., Howard, R.A., Korendyke, C.M., Simnett, G.M. & Webb, D.F., 2000, Proc. SPIE Vol. 4139, 284-293. The STEREO Heliospheric Imager: How to Detect CMEs in the Heliosphere Harrison, R.A., Davis, C.J. and Eyles, C.J. 2005, Adv. Space Research 36, 1512-1523. The Heliospheric Imagers Onboard the STEREO Mission C.J. Eyles et al, Solar Physics, DOI 10.1007/s11207-008-9299-0
A full reference list can be found at www.stereo.rl.ac.uk
4 Oct 2009 13:52