Principal: Alberto
Deputy: dfrayer
Data Analyst(s): Dave Frayer and/or Stefani Wachter
Priority: Normal
Downlink Priority: Normal
Analysis Time: 7hrs
Last Updated: July 8, 2003

Objective

To determine the maximum useful MIPS integration time in the presence of Cosmic-ray hits.

Description

While illuminating the Ge:Ga detectors at a low level, take images at the different allowed integration times to evalute the trade off between "background limited" and "not completely swamped with particle hits, aka Cosmic Rays". Photometry AORs for 70 and 160um arrays at 3, 10 and 30sec [modified AOR] will be used.

Data Collected

  • 69 DCEs are commanded for both 70 & 160um. Data for 24um could be used to provide an independent measurement of the 'number' of hits (CRs), although the array itself sees the stim flash.

    Data Reformatting Requirements

    Array Data Desired:

    70 and 160 µm

    Data Reformatting Option:

    Special Instructions:
    none

    Task Dependencies

    Calibration Dependencies

    Standard Calibration:: Electronic Linearity Correction, Dark Current image and Illumination correction.

    Output and Deliverable Products

  • 69 DCEs, 5 BCDs per GE:Ga array.

    Data Analysis

    SUR data for 70 and 160um arrays will be analyzed to determine the contribution to the noise from radhits. Both the DAT and SSC pipeline provide a measurement of these effects. It should be possible to create a table of integration times versus noise and radhits and to determine, at first approximation, the effect from Cosmic Rays.

    Software Requirements

    Actions Following Analysis

    Obtained data is downlinked and analyzed. Radhits are an unavoidable component of the space environment, so is good to understand as much as possible their effect on the arrays. The "noise" on the arrays should help us to determine how badly the arrays are being affected by "radhits".

    Failure Modes and Responses

    Aquired required data using the default integrations times.

    Additional Notes