Plots of SAS data from the HEIDI Balloon Flight, June 22, 1993

The first image shows the limb position reconstructed from "3-crossing" data. (Most of the data consisted of pixel values of the limb crossings on 3 of the 4 SAS arms.)

The second image shows 100x magnifications of the departures of the radius values at the same azimuths as the first figure. The RMS deviation of the radius in these data was 0.300 arc sec, more than adequate for the 11-arcsec resolution of the HEIDI collimators, and almost good enough for HESSI.

Last updated December 23, 1997.