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8.1 Overview  

In derive auto-analysis results (Derive_AAR), the calibrated data from Derive_SPD are further processed to more advanced astronomical products such as point source flux per filter, flux sequences in multi-aperture mode, spectra, or maps. PHT SPD products provide in essence the average power on the detector in Watts per record and are independent of the observing mode. Each SPD record corresponds to a chopper plateau or raster position. Differences among PHT SPD products emerge mainly from the detector subsystem (PHT-P, -C or -S) used.

In contrast to SPD, the auto-analysis results (AAR) products are defined by the observing mode selected. As a consequence, the processing sequence and resulting AAR product are to large extent determined by the observing template (AOT) applied and the specific instrument settings used in the AOT.

Nevertheless, different ISOPHOT AOT's may require identical Derive_AAR processing steps. To avoid repetition in the descriptions, we first describe the common routines. The following generic observing modes can be identified, for which a more global description can be given:

• Photometry (section 8.4)
• Mapping (section 8.5)
• Spectroscopy (section 8.6)

In the remainder of this section we first give an overview of the processing steps for each AOT (section 8.2). In the subsequent sections the processing steps shared by all PHT AOTs (section 8.3) and the processing details related to the different observation modes are described.