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SECCHI is a set of remote sensing instruments designed to follow Coronal Mass Ejections (CMEs) from their origins on the Sun, out through the corona and the interplanetary medium and to possible impact with the Earth.

The instrument package comprises 3 telescopes:

STEREO is the first mission dedicated to understanding the physics of CMEs and their effects on the Earth's environment. The mission's overall science objectives are as follows:

Within these objetives SECCHI has its own primary science goals to:

The HI instruments, with their unique FOV, will provide the first direct imaging observations of CMEs in the inner heliosphere. As such it will directly address the issue of the forces that control CME evolution and propagation in the corona inner heliopshere, as well as providing insights into the mechanisms and sites of particle acceleration in this region and space weather alerts.

Brief instrument details are given below:






EUVI - EUV Imager

Jim Lemen [Lockheed]

Narrow band Ritchey-Cretien

He II 304, Fe IX 171, Fe XII 195, Fe XV 284 A

1.6 arcsec/pixel 0.9 deg FOV Sun-centred

COR1 - Coronagraph 1

Joe Davila [GSFC]

Internally occulted coronagraph

650-660 nm (brightness and pB)

7.5 arcsec/pixel 1.3-4.0 R (full revolution; Sun centred)

COR2 - Coronagraph 2

Dennis Socker [NRL]

Externally occulted coronagraph

650-750 nm (brightness and pB)

15 arcsec/pixel 2-15 R (full revolution; Sun centred)

HI - Heliospheric Imager

Richard Harrison [RAL]

Externally occulted coronagraph

HI1 - 650-750 nm (brightness)

35 arcsec/pix

20o circle centred at 13.28o to Sun centre (3.28-23.28o along ecliptic)

HI2 - 400-1000 nm (brightness)

240 arcsec/pix 70o circle centred at 53.36o to Sun centre (18.36-88.36o along ecliptic)