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Energetic particle dropouts observed in the morning sector by the geostationary satellite GEOS‐2
Author(s) -
Kopányi Vilmos,
Korth Axel
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02910
Subject(s) - substorm , geostationary orbit , morning , magnetosphere , plasma sheet , satellite , geophysics , midnight , atmospheric sciences , local time , noon , environmental science , physics , meteorology , geology , magnetic field , astronomy , statistics , mathematics , quantum mechanics
Energetic particle dropouts were observed in the local morning sector with the particle spectrometer S321 onboard the European geostationary satellite GEOS‐2. The dropouts usually last 10 to 30 minutes. They differ from those commonly observed in the midnight sector during growth phases of substorms and also from magnetopause crossings. They occur during the recovery phase and are well inside the magnetosphere. During the dropouts the total magnetic field increases. Ground magnetic recordings and AE indices show that the dropouts are related to the substorm recovery phase during multiple substorm events. Ground magnetic recordings also reveal that in the majority of the cases a new substorm activation is seen in the midnight sector simultaneously with the recovery phase signatures in the morning sector. The dropouts are most likely associated with locally thinning of the morning side plasma sheet.