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2014 Fiscal Year Final Research Report

Elucidation of magnetospheric convection mechanisms during northward interplanetary magnetic field periods

Research Project

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Project/Area Number 24540479
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionKyushu University

Principal Investigator

WATANABE Masakazu  九州大学, 学内共同利用施設等, 准教授 (70446607)

Project Period (FY) 2012-04-01 – 2015-03-31
Keywordsシータオーロラ / 沿磁力線電流 / プラズマ対流 / 磁気圏ダイナモ
Outline of Final Research Achievements

Using global numerical simulation, we elucidated the theta aurora formation processes when the dawn-dusk component of the interplanetary magnetic field switches. There appears a unipolar field-aligned current system on the theta aurora. In the magnetospheric source region of the currents, expanding slow mode disturbances convert plasma thermal energy to electromagnetic energy to maintain the steady state field-aligned current system. This energy conversion process represents the essential mechanism of the magnetospheric dynamo in general, not just limited to the theta aurora.

Free Research Field

磁気圏物理学

URL: 

Published: 2016-06-03  

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