HESSI/Mode Definitions & Transitions

Flow Chart
Acquisition Mode: Establishes desired spin rate and damps transverse rates

Precession Mode: Establishes Sun-pointing orientation

Normal Mode: Maintains Sun-pointing orientation and nominal spin rate; encompasses fine precession, nutation, and spin rate control

Spin Mode: Establishes desired spin rate

Idle Mode: Disables control until ground intervention

Balance Operations: Balances spacecraft LADs to obtain pure Imager axis

L. Garcia


	Acquisition Mode: Establishes desired spin rate and damps transverse rates Precession Mode: Establishes Sun-pointing orientation Normal Mode: Maintains Sun-pointing orientation and nominal spin rate; encompasses fine precession, nutation, and spin rate control Spin Mode: Establishes desired spin rate Idle Mode: Disables control until ground intervention Balance Operations: Balances spacecraft LADs to obtain pure Imager axis