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Related Experiment Video

Updated: Nov 15, 2025

Magnetically Induced Rotating Rayleigh-Taylor Instability

Magnetically Induced Rotating Rayleigh-Taylor Instability

Published on: March 3, 2017

Mirror Instabilities in the Inner Magnetosphere and Their Potential for Localized ULF Wave Generation.

M B Cooper¹, A J Gerrard¹, L J Lanzerotti¹

¹Center for Solar-Terrestrial Research New Jersey Institute of Technology Newark NJ USA.

Journal of Geophysical Research. Space Physics

|March 8, 2021

Summary

This summary is machine-generated.

NASA Van Allen Probes data reveal mirror/drift-mirror unstable plasma regions in the night-side inner magnetosphere. These findings identify the source of storm time Pc5 ULF waves, suggesting a new generation mechanism.

Keywords:

ULF waves inner magnetosphere magnetotail injections mirror mode unstable plasma

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Published on: July 30, 2020

Area of Science:

Space Physics
Plasma Physics
Magnetospheric Physics

Background:

Observations show mirror/drift-mirror (M/D-M) unstable plasma regions in the night-side inner magnetosphere.
These regions exist on the kinetic-frozen-in plasma threshold, favoring M/D-M mode formation and ultralow frequency (ULF) wave signatures.

Purpose of the Study:

To perform a climatological analysis of plasma anisotropy (gamma) and beta in the inner magnetosphere.
To identify the conditions and most likely regions for M/D-M instability.
To investigate the source region of storm time Pc5 ULF waves.

Main Methods:

Analysis of plasma anisotropy (gamma) and total plasma beta.
Application of bi-Maxwellian distribution assumptions to assess instability conditions.
Climatological study of M/D-M unstable plasma regions using Van Allen Probes data.

Main Results:

A strong preference for M/D-M unstable plasmas was found in the premidnight sector of the night-side magnetosphere.
Observed events ranged from half-minute to several-hour durations.
The statistical distribution explicitly identifies the source region for storm time Pc5 ULF waves.

Conclusions:

The premidnight inner magnetosphere is a key region for M/D-M instability.
These findings suggest an alternative generation mechanism for storm time Pc5 ULF waves.
The study enhances understanding of magnetospheric plasma dynamics and ULF wave generation.