The Low-Latitude Auroral Boundary: Steady-State and Time-Dependent Representations.

Recently, extensive data sets have been acquired from charged-particle detectors on low-altitude satellites pertinent to the study of the low-latitude boundary of the aurora, including both case studies and statistical treatments. The low latitude auroral boundary can be thought of as the low-altitu...

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Bibliographic Details
Main Authors: Gorney, D J, Evans, D S
Other Authors: AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB
Format: Text
Language:English
Published: 1988
Subjects:
Atmospheric Physics
*AURORAE
ARTIFICIAL SATELLITES
BOUNDARIES
CASE STUDIES
CHARGED PARTICLES
DATA BASES
DETECTORS
ELECTRONS
ENERGY
LIMITATIONS
LOW ALTITUDE
MAGNETOSPHERE
MODELS
PARAMETERS
PARTICLES
PATTERNS
PRECIPITATION
RATES
SHAPE
SPACECRAFT
SPATIAL DISTRIBUTION
STATISTICAL ANALYSIS
STEADY STATE
STRENGTH(GENERAL)
TIME DEPENDENCE
ARCTIC REGIONS
CONVECTION(ATMOSPHERIC)
Arctic
Online Access:http://www.dtic.mil/docs/citations/ADA193200
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA193200
Description
Summary:Recently, extensive data sets have been acquired from charged-particle detectors on low-altitude satellites pertinent to the study of the low-latitude boundary of the aurora, including both case studies and statistical treatments. The low latitude auroral boundary can be thought of as the low-altitude manifestation of convection boundaries for magnetospheric particles of moderate energy, although the detailed shape of the boundary might be modified locally by spatial variations or temporal modulation of precipitation rates. Several attempts have been made to compare observed equatorial and low-altitude boundaries with theoretical representations, with varying degrees of success. Here, the results of statistical analysis and case studies of the auroral boundary using precipitating particle data acquired by the NOAA spacecraft are presented. The ability of standard convection models to account for the observed boundary characteristics is discussed, with emphasis on the roles of convection strength and time dependence. It is demonstrated that, within reasonable parameter limits, steady-state convection patterns for moderate energy electrons generally fail to account for certain observed characteristics of boundary shapes. Keywords: Aurora, Magnetospheric particles, Magnetospheric activity.

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