1989•Geophysical Research LettersRequires access

The universal time variation of geomagnetic activity

C. T. Russell

Abstract

Geomagnetic activity exhibits both annual and daily variations. We examine these variations in the Am index which was designed to provide an accurate measure of the Universal Time variation of geomagnetic activity. The dayside reconnection process can quantitatively account for the observed variation in both indices. Control of these variations by the angle of the flow relative to the dipole axis is weaker than control by reconnection.

About this research paper

What this paper is about

Why it matters

OpenAlex reports 26 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Key concepts: Earth's magnetic field, Universal Time, Variation (astronomy), Geomagnetic secular variation, Physics, Local time, Atmospheric sciences, Geophysics