Back to Search Start Over

Large-amplitude magnetic variations in quasi-parallel shocks - Correlation lengths measured by ISEE 1 and 2

Authors :
Greenstadt, E. W
Hoppe, M. M
Russell, C. T
Source :
Geophysical Research Letters. 9
Publication Year :
1982
Publisher :
United States: NASA Center for Aerospace Information (CASI), 1982.

Abstract

Wide separations up to more than 1 earth radius between ISEE 1 and 2 during the second half of 1978 have been used to measure the correlation length of magnetic pulsations in quasiparallel shocks. When the two spacecraft were less than a few hundred km apart, magnetic oscillations measured by magnetometers on both spacecraft exhibited virtually identical waveforms, but at distances of several thousand km, the two time series of field variation showed no detailed similarily at all. The correlation coefficients of the pulsations dropped from close to 1.0 for spacecraft separations of less than 100 km to 0.2 for separations of greater than 800 km. A correlation length of several hundred km may be related to the gyroradius of return protons with energy typical of the peaks of diffuse and beam ion distributions.

Subjects

Subjects :
Geophysics

Details

Language :
English
Volume :
9
Database :
NASA Technical Reports
Journal :
Geophysical Research Letters
Notes :
NASW-3087, , NAS5-25772, , F49620-81-C-0003, , NASW-3449
Publication Type :
Report
Accession number :
edsnas.19820054812
Document Type :
Report