Plasma sheet particle penetration as intense nose structures into the inner magnetosphere

NY Ganushkina*, T.I. Pulkkinen, VF Bashkirov

*Corresponding author for this work

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

Abstract

A class of events when plasma sheet particles penetrate to the ring current region termed 'intense nose' structures observed on Polar/CAMMICE ion spectrograms is examined. A well-observed event occurred on November 3, 1997, when clear signatures of an intense nose structure were observed during substorm activity on three subsequent inner magnetosphere crossings by Polar and Interball Auroral probe. We trace particles numerically in stationary (Volland-Stern and Tsyganenko T96) and time-varying (Gaussian electric field pulse and corresponding magnetic field) fields to examine the inward motion of the nose structure. In our tracing procedure particles are lost due to convection outflow to the dayside magnetopause and charge exchange with neutral hydrogen. We also take into account the energy loss by particles due to the ionization. We inject several particle clouds with time delays of about one minute during the particle tracing. For the case of November 3, 1997 event the modeling predicts that under time varying fields particles could be moved into the inner magnetosphere within a few tens of minutes, which is consistent with the observations. We use the tracing procedure to model the observed particle fluxes in the intense nose structures and discuss the energy evolution of particles during the motion in both stationary and time-dependent fields.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON SUBSTORMS
EditorsA Wilson
Pages389-392
Number of pages4
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

  • inner magnetosphere
  • particle trajectories
  • electric fields
  • ELECTRIC-FIELDS
  • LARGE-SCALE
  • SUBSTORM
  • INJECTIONS
  • MODEL

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