Characteristics of the inverted-V events observed by the KYOKKO satellite

• Main Authors: Mukai, Toshifumi, Hirao, Kunio
• Language: English
• Published: 1982
• Subjects: Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/record/1263/files/KJ00000011898.pdf

P(論文) Measurements of both upward and downward electron fluxes on the KYOKKO satellite have revealed following characteristics of the inverted-V events. (1) Inverted-V events have various durations from a few tens of seconds up to several minutes. Existence of the long-duration structure with nearly constant energy of the monoenergetic peak indicates that the inverted-V structure is stable rather than transient and also that the equipotential contours of the electric field for acceleration of auroral electrons are extensive in longitude and have a meridional cross-section that is V-shaped. (2) The source region of inverted-V electrons seems to be on the closed field lines as well as on the open field lines. (3) Inverted-V events occur at all local times except around noon and at higher latitudes in the dayside hemisphere, although the occurrence frequency is least in the morning sector (0300-1200MLT). They occur most frequently at invariant latitudes of 65°-70° in the premidnight sector under disturbed conditions. departmental bulletin paper