Structure of non-adiabatic current sheets: Role of the trapped population and phase mixing

H Malova*, AA Bykov, VY Popov, T.I. Pulkkinen, AS Sharma, LM Zelenyi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Self-consistent model of 1D current sheet (CS) enables to explore analytically the properties of equilibrium solutions in dependence on the parameters of the input distributions (e.g. plasma mantle) forming the structure of the magnetic field reversal. Distribution functions depends in this model only on two most natural parameters (integrals or approximate integrals of motion): particle energy W, and quasiadiabatic invariant I-z. There are two topologically disjoint regions in the phase space of nonadiabatic particles: (a) integrable orbits (trapped particles), (b) quasiadiabatic orbits, crossing the separatrix (transient particles). Population (a) in the CS could originate from the sources different from plasma mantle (e.g. LLBL). While the basic structure of CS is formed by paramagnetic currents carried by particles at transient orbits (b), trapped particles (a) might have significant effect on the CS structure. Because this population is phase mixed along the integrable invariant tori, the total cross-tail current carried by trapped particles should be absent. Their pronounced effect is two fold: trapped particles could appeciably reduce the paramagnetic current density near the tail midplane and partially compensate the diamagnetic currents of transient particles at the edges of CS. Considering the amount of trapped particles as a free parameter we study their influence on the characteristic profile of the magnetic field. Sometimes at the edge of CS magnetic field experiences the characteristic overshoot feature, with the amplitude directly related to the plasma content of the trapped domain.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON SUBSTORMS
EditorsA Wilson
Pages177-182
Number of pages6
Publication statusPublished - 2000
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Substorms - St. Petersburg, Russian Federation
Duration: 16 May 200020 May 2000
Conference number: 5

Publication series

NameESA SPECIAL PUBLICATIONS
PublisherESA PUBLICATIONS DIVISION C/O ESTEC
Volume443
ISSN (Print)0379-6566

Conference

ConferenceInternational Conference on Substorms
Abbreviated titleICS
CountryRussian Federation
CitySt. Petersburg
Period16/05/200020/05/2000

Keywords

  • magnetospheric current sheet
  • dynamics of particles in the curved magnetic field
  • quasiadiabatic theory
  • nonadiabaticity
  • phase mixing
  • CROSS-TAIL CURRENT
  • PARTICLE ORBITS
  • GROWTH-PHASE
  • SUBSTORM
  • MAGNETOTAIL
  • MOTION
  • FIELD

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