Particle Detectors
type: Concept

SSI/ES
type: Concept
in scheme: instruments
definition: [Source: National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1990-105A-03 ] The primary purpose of the ionospheric/scintillation monitor, SSI/ES, is to measure electron density and temperature, hydrogen and oxygen ion density and temperature, the power spectrum of plasma irregularities, and the velocity components of bulk plasma flow at satellite altitude. The experiment consists of four sensors. The electrostatic analyzer measures electron parameters at least 1 m above the satellite surface. The ion retarding potential analyzer has a body-mounted electrostatic trap with a circular aperture to measure ion density and temperature. The driftmeter uses a planar electrostatic ion trap with a four-quadrant collector. The current is measured in pairs of quadrants and differenced to provide plasma drift velocities. The scintillation monitor obtains power spectrum irregularities by an ion trap with electrometer and amplifiers capable of measuring direct and alternating current in the frequency range from 20 Hz to 12 kHz. Group: Instrument_Details Entry_ID: SSI/ES Group: Instrument_Identification Instrument_Category: Solar/Space Observing Instruments Instrument_Class: Particle Detectors Short_Name: SSI/ES Long_Name: Special Sensor Ionospheric Plasma Monitor End_Group Group: Associated_Platforms Short_Name: DMSP 5D-3/F15 Short_Name: DMSP 5D-2/F11 Short_Name: DMSP 5D-2/F10 Short_Name: DMSP 5D-2/F9 Short_Name: DMSP 5D-2/F8 End_Group Group: Spectral_Frequency_Information Spectral_Frequency_Coverage_Range: 20 Hz to 12 kHz End_Group Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1990-105A-03 Creation_Date: 2008-09-26 Group: Instrument_Logistics Instrument_Owner: Department of Defense-Department of the Air Force (United States) End_Group End_Group