An Upper Limit on the Aperture Separation of Ion Drift Meters

Details An Upper Limit on the Aperture Separation of Ion Drift Meters An Upper Limit on the Aperture Separation of Ion Drift Meters

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..83...37b&link_type=abstract

Astrophysics and Space Science, Volume 83, Issue 1-2, pp. 37-49

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

An upper limit has been calculated on the effective aperture separation or detector thickness of ion drift meters of two fundamental types. The limit applies to meters which compare currents collected by detectors with different view directions at the same retarding potential and to meters which measure the entire thermal ion distribution function. For both types, a single scanned detector may be employed instead of multiple detectors, in which case the limit applies to twice the radius of curvature of the path followed by the detector aperture during a scan, (i.e. the diameter of a spinning payload). The limit was found to be important in two cases. First, in the F region on spacecraft with stringent electrostatic cleanliness requirements, the 10% error limit was found to be 40 cm. Second, in the E region, the limit was found to be ≲1 cm.

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