All Physics Faculty Publications

Title

A Study of Plasmaspheric Density Distributions for Diffusive Equilibrium Conditions

Document Type

Article

Journal/Book Title/Conference

Planetary and Space Science

Volume

31

Issue

11

Publication Date

1983

First Page

1315

Last Page

1327

DOI

10.1016/0032-0633(83)90068-5

Abstract

We have modelled the plasmaspheric density distribution for a range of solar cycle, seasonal and diurnal conditions with a magnetic flux tube dependent diffusive equilibrium model by using experimentally determined values of ionospheric parameters at 675 km as boundary conditions. Data is presented in terms of plasmaspheric H+ and He+ density contours, total flux tube content and equatorial plasma density for a range of L-values from 1.15 to 3.0. The variation of equatorial density with L-value shows good agreement with the 1/L4 dependence observed experimentally. The results show that the model predicts larger solar cycle and diurnal variation in equatorial plasma density than observed using whistler techniques. However, the whistler method requires a model to deduce the equatorial density and is therefore open to interpretation. Seasonal variations are rather artificial since in this general model we have not attempted to match equatorial densities for flux tubes emanating from the winter and summer hemispheres.

Comments

Originally published by Elsevier. Publisher’s PDF available through remote link.

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