NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

SNOE Auroral Photometer, 12.5-18 A

NSSDCA ID: 1998-012A-02

Mission Name: SNOE
Principal Investigator:Dr. Charles A. Barth


The auroral photometer (AP) is a two-channel broad-band instrument that is used to determine the energy deposited in the upper atmosphere by energetic auroral electrons. It is similar to airglow photometers developed by LASP and flown on OGO-5 and -6 in the late 1960's. Each channel consists of a Hamamatsu phototube detectors, a UV filter, and a field of view limiter (circular, 11 degree full-cone). The combination of a CsI photocathode and a CaF2 filter produces a bandpass from 125 to 180 nm for channel A, allowing a combined measurement of the LBH bands, the OI doublet at 135.6 nm, and the OI triplet at 130.4 nm. For channel B a barium fluoride (BaF2) filter is used producing a 135 to 180 nm bandpass and providing a measurement of the LBH bands and the OI doublet at 135.6 nm with the exclusion of the OI triplet at 130.4 nm. The sensitivity of channel A at 130.4 nm is 23 counts/second/Rayleigh and the sensitivity of channel B at 135.6 nm is 26 counts/second/Rayleigh. The AP is mounted with its optical axis perpendicular to the spacecraft spin axis. The AP produces continuous data with an integration time of 183 ms, but only the downward-looking part of each spin will be stored.

Alternate Names

  • AP
  • Auroral Photometer

Funding Agency

  • NASA-Office of Space Science (United States)


  • Space Physics: Ionospheric Studies
  • Space Physics: Thermospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. Dieter K. Bilitza



NameRoleOriginal AffiliationE-mail
Dr. Stanley C. SolomonCo-InvestigatorUniversity of
Dr. Charles A. BarthPrincipal InvestigatorUniversity of
[] NASA Logo -