Comparison Of Data From The Low Energy Electrostatic Analyzers On Satellite P78 1
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Comparison of Data from the Low Energy Electrostatic Analyzers on Satellite P78-1 by Roger P. Vancour Pdf
Air Force satellite P78-1 has aboard, on the wheel section, two detectors each consisting of a low energy and a high energy electron electrostatic analyzer. The low energy analyzer collects electrons in the energy range of 50 eV to 1 keV and the high energy analyzer collects electrons in the energy range of 1 keV to 20 keV. The two detectors were placed 90 apart on the wheel section of the satellite. The leading detector in the wheel's rotation is denoted as Detector 1.
P78-2 SCATHA Preliminary Data Atlas by E. G. Mullen Pdf
A preliminary study of the 100 eV to approx. 1 MeV plasma environment encountered by the P78-2 Spacecraft Charging at High Altitudes (SCATHA) satellite during its initial operation period was conducted. Forty-four days of 10-min averages of the four moments of the electron and ion distribution functions calculated from the SC5 and SC9 energetic particle measurements were analyzed to determine occurrence frequency, local time variation, geomagnetic activity variation, and L-shell variation. The single and double Maxwellian parameters derived from the four moments were similarly analyzed. The interrelationships between the moments and derived parameters were computed and the results compared with the ATS-5 and ATS-6 atlas of Garrett et al (1980). Results of this analysis establish a baseline range for the SCATHA plasma environment.
Cities and Their Vital Systems by Advisory Committee on Technology and Society Pdf
Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.
Interference Problems on Wing-fuselage Combinations in Inviscid, Incompressible Flow by Aeronautical Research Council (Great Britain),J. Weber,M. Gaynor Joyce Pdf
Real Time, Automatic Vehicle Potential Determination from ESA Measurements by Stanley L. Spiegel Pdf
The problem of spacecraft charging at high altitudes is an important one for Air Force applications; indeed a major effort (SCATHA Project) has been undertaken to understand this phenomenon. Quite simply, when a space vehicle at geosynchronous orbit, interacting with its plasma environment, acquires a high negative potential (of the order of 1/2 kV), it is possible that onboard instrumentation will be damaged by electrical discharge between differentially charged surfaces of the spacecraft. Thus it is important to activate a discharge mechanism as soon as a dangerously high potential develops. This means it is necessay to have a reliable method of determining the real time vehicle potential, or more specifically, distinguishing whether or not the potential has reached or exceeded critical levels. An algorithm incorporating an onboard microprocessor to analyze data obtained by the vehicle, and determine the extent of charging, is desirable. Computational simplicity and speed are important considerations in the design of such an algorithm. Examination of data from the P78-2 satellite has indicated that electrostatic analyzer (ESA) ion count data, could serve as input to an algorithm designed to fulfill the aforementioned objectives. The development and testing of one such algorithm, referred to as the count ration algorithm, are described.
