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Title: Solar flares and magnetospheric particles: investigations based upon the ONR-602 and ONR-604 experiments. Annual letter report for period ending 30 November 1987

Abstract

Data from the ONR-602 experiment, obtained in a low-altitude polar orbit, are being analyzed to investigate the composition, intensity levels, and time variations of energetic charged particles both trapped within the Earth's magnetosphere and incident upon the magnetosphere from interplanetary space, particularly solar-flare particles. The effort involves both data analysis/interpretation and detailed modeling of the near-Earth environment. The research focusses on the global zones of low-energy-particle precipitation, including the South Atlantic Anomaly region from which access to the radiation belts is obtained, and the solar particle events of May-Nov., 1982. In addition, scientific/technical support is being provided to the ONR-604 experiment to be launched on the CRRES mission. The results of these investigations will enhance our understanding of the geospace radiation environment and its effects on men, materials, and electronic systems in space. The objectives of this research are to investigate the nature and origins of the particle populations in near Earth space by focusing on their spatial distributions, composition, energy spectra, and temporal variations and to look at couplings between interplanetary (solar-flare-generated) and magnetospheric populations. The goal is to understand the geospace environment in which men and spacecraft must survive and function.

Authors:
Publication Date:
Research Org.:
Louisiana State Univ., Baton Rouge (USA). Dept. of Physics and Astronomy
OSTI Identifier:
6907877
Report Number(s):
AD-A-193396/9/XAB
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHARGED-PARTICLE PRECIPITATION; TRAPPING; EARTH MAGNETOSPHERE; RADIATION BELTS; SOLAR FLARES; DATA PROCESSING; ELECTRONIC EQUIPMENT; INTERPLANETARY SPACE; PROGRESS REPORT; SOLAR ACTIVITY; SPATIAL DISTRIBUTION; SPECTRA; DISTRIBUTION; DOCUMENT TYPES; EARTH ATMOSPHERE; EQUIPMENT; PROCESSING; SPACE 640104* -- Astrophysics & Cosmology-- Solar Phenomena; 640201 -- Atmospheric Physics-- Auroral, Ionospheric, & Magetospheric Phenomena

Citation Formats

Wefel, J.P. Solar flares and magnetospheric particles: investigations based upon the ONR-602 and ONR-604 experiments. Annual letter report for period ending 30 November 1987. United States: N. p., 1988. Web.
Wefel, J.P. Solar flares and magnetospheric particles: investigations based upon the ONR-602 and ONR-604 experiments. Annual letter report for period ending 30 November 1987. United States.
Wefel, J.P. 1988. "Solar flares and magnetospheric particles: investigations based upon the ONR-602 and ONR-604 experiments. Annual letter report for period ending 30 November 1987". United States. doi:.
@article{osti_6907877,
title = {Solar flares and magnetospheric particles: investigations based upon the ONR-602 and ONR-604 experiments. Annual letter report for period ending 30 November 1987},
author = {Wefel, J.P.},
abstractNote = {Data from the ONR-602 experiment, obtained in a low-altitude polar orbit, are being analyzed to investigate the composition, intensity levels, and time variations of energetic charged particles both trapped within the Earth's magnetosphere and incident upon the magnetosphere from interplanetary space, particularly solar-flare particles. The effort involves both data analysis/interpretation and detailed modeling of the near-Earth environment. The research focusses on the global zones of low-energy-particle precipitation, including the South Atlantic Anomaly region from which access to the radiation belts is obtained, and the solar particle events of May-Nov., 1982. In addition, scientific/technical support is being provided to the ONR-604 experiment to be launched on the CRRES mission. The results of these investigations will enhance our understanding of the geospace radiation environment and its effects on men, materials, and electronic systems in space. The objectives of this research are to investigate the nature and origins of the particle populations in near Earth space by focusing on their spatial distributions, composition, energy spectra, and temporal variations and to look at couplings between interplanetary (solar-flare-generated) and magnetospheric populations. The goal is to understand the geospace environment in which men and spacecraft must survive and function.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1988,
month = 2
}

Technical Report:
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  • Data from the ONR-602 experiment, obtained in a low-altitude, polar orbit are being analyzed to investigate the composition, intensity levels and time variations of energetic charged particles both trapped within the Earth's magnetosphere and incident upon the magnetosphere from interplanetary space, particularly solar-flare particles. The effort involves both data analysis/interpretation and detailed modeling of the near-Earth environment. The research focusses on the 'global zones' of low-energy particle precipitation, including the South Atlantic Anomaly region from which access to the radiation belts is obtained, and the solar particle events of May-Nov., 1982. In addition, scientific/technical support is being provided to themore » ONR-604 experiment to be launched on the CRRES mission. The results of these investigations will enhance our understanding of the geospace radiation environment and its effects on men, materials, and electronic systems in space.« less
  • The project involves analysis of the data returned from the ONR-602 (Phoenix-1) experiment on the S81-1 on mission in 1982, correlation of the Phoenix-1 dataset with other measurements, and scientific planning for the launch and operation of a sister experiment, ONR-604, on the CRES mission. During the past year significant progress was made in understanding the ONR-602 instrument performance and the dataset, in analyzing the low-energy protons observed in the equatorial belt, in summarizing solar energetic-particle observations, and in working with the CRRES/SPACERAD Science Team.
  • The work performed during the past year can be divided into three areas: (1) data reduction/processing and instrument response; (2) solar-flare studies; and (3) magnetospheric particles. Our analysis effort had been divided between obtaining an overview of the entire ONR-602 (Phenix 1) dataset, identifying data processing/analysis problems and locating scientifically interesting effects for additional study, and studying specific areas or fully understand the operation of the ONR-602 instrument in the space environment and the complicated particle-flux variations over the spacecraft orbit.
  • This performance report covers work accomplished under ONR Grant N00014-90-J-1466 related to the radiation environment in near-Earth space. The goal of the research is to measure and describe, quantitatively, the Geospace radiation environment in which men and spacecraft must survive and function. The tools for this investigation are the data returned by the ONR-602 and ONR-604 experiments, both flown under the auspices of ONR and the Air Force Space Test Program, augmented by correlative databases of both space-based and ground-based data. The investigation involves data analysis, modeling and applications to a variety of space equipment and environments. This report buildsmore » upon the detailed Technical Report (Fall, 1992) and the previous performance reports. For the current period, the principal effort was in modeling of the Anomalous Component, determining the modulation level during the CRRES Mission, and studying the quiet-time particle access to the magnetosphere.« less
  • This performance report covers work related to the radiation environment in near-Earth space. The goal of the research is to measure and describe, quantitatively, the Geospace radiation environment in which men and spacecraft must survive and function. The tools for this investigation are the data returned by the ONR-602 and ONR-604 experiments and augmented by correlative databases of both space-based and ground-based data. The investigation involves data analysis, modeling and applications to a variety of space equipment and environments.