Charging characteristics of Dynamic Explorer I Retarding Ion Mass Spectrometer and the consequence for core plasma measurements
Olsen, Richard Christopher
MetadataShow full item record
The Retarding Ion Mass Spectrometer (RIMS) on the Dynamics Explorer I (DE I) satellite has provided a new range of data, and challenges for studies of the core plasma of the magnetosphere. Analysis of the RIMS data provides a measure of the satellite potential in the inner magnetosphere. As the satellite leaves the inner plasmasphere, it begins to charge positively, crossing the 0 V mark at about 1000/cc. The potential rises slowly initially, reaching about 1 V near the plasmapause, at the 100/cc point. At lower densities, the potential rises relatively rapidly, reaching +5 V or greater at the 10/cc point. For satellite potentials of +1 to +5 V, portions of the ion distribution function are lost to measurement because the ions are repelled by the satellite. In particular, in a multi-temperature plasma, the cold component is easily lost in this potential (density) regime. It is in this regime where aperture bias techniques have been successfully used, particularly in measurements of field- aligned ion flows such as the polar wind, which have sufficient kinetic energy to overcome electrostatic barriers in front of the aperture plane. At lower densities (<10/cc), the satellite potential can exceed +5 V. At such potentials the core plasma is lost to the RIMS, and even the aperture bias techniques are no lower successful. Keywords: Spacecraft charging; Thermal plasmas; Mass spectrometry. (EDC)
Approved for public release; distribution is unlimited.
NPS Report NumberNPS-61-89-014
Showing items related by title, author, creator and subject.
Morris, James H. (Monterey, California. Naval Postgraduate School, 1994-03);The SPEAR III experiment was conducted in an effort to better understand and compensate for the effects of satellite charging, at levels up to KV. This experiment was designed as a lower-ionosphere test to both record ...
Lowery, Donald Ray (1987-12);The Air Force P78-2 satellite, known as SCATHA, was designed to study spacecraft charging processes at geosynchronous orbit. This thesis examines the plasma wave data taken during two periods when active experiments were ...
Yilmaz, Ali I. (Monterey, California. Naval Postgraduate School, 2012-06);Flashboard Plasma Cathodes (FBPCs) are potential rugged electron sources for generating high-current beams needed for future High Power Microwave Weapons. In FBPCs, dielectric material is in contact with electrodes in a ...