Premium
Energy dispersion features in the vicinity of the cusp
Author(s) -
Karra Maria,
Fritz Theodore A.
Publication year - 1999
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 - 10.1029/1999gl003646
Subject(s) - cusp (singularity) , latitude , polar , dispersion (optics) , physics , atmospheric sciences , astrophysics , computational physics , geophysics , astronomy , geometry , optics , mathematics
Highly energetic particles have been observed by the Polar spacecraft in the vicinity of the cusp. The energy of these particles, which often exceeds 1 MeV, is frequently characterized by dispersion. Emphasis is given to the data obtained by Polar in the time interval March 1996–May 1997. Time‐Energy Dispersive (TED) features are observed almost every day in the vicinity of the dayside cusp (and usually multiple times in one day), from 66° to 78° invariant latitude, while no TEDs are detected at latitudes lower than 60° or higher than 84°. In addition, TEDs are observed mostly around the time period between 12:00 and 15:00 MLT, and they can last from a few minutes up to three hours.