Θεόδωρος Σαρρής
Επίκουρος Καθηγητής, Τμήμα Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών, Δ.Π.Θ.
Επίκουρος Καθηγητής, Τμήμα Ηλεκτρολόγων Μηχανικών και Μηχανικών Υπολογιστών, Δ.Π.Θ.
12:00 Αστεροσκοπείο
Περίληψη:
The Earth’s magnetosphere often undergoes oscillations in the Ultra
Low Frequency (ULF) range, roughly 1 mHz to 1 Hz (periods 1 to 1000
sec), which are a fundamental response of the magnetosphere to various
external or internal drivers. ULF waves can have significant effects,
such as enhancing the radial diffusion of radiation belt energetic
electrons, which have drift periods of the same order. We will discuss
observations of ULF wave events as well as statistical studies of the
distribution of ULF waves, based on which we constructed models that
simulate the interaction of ULF waves with energetic particles. We
will also discuss the importance of knowledge of the azimuthal mode
numbers of ULF waves for wave-particle interactions, and will present
calculations of the waves’ mode numbers and phase velocities, as
performed from observations of phase-differences on the ground and in
space.
Low Frequency (ULF) range, roughly 1 mHz to 1 Hz (periods 1 to 1000
sec), which are a fundamental response of the magnetosphere to various
external or internal drivers. ULF waves can have significant effects,
such as enhancing the radial diffusion of radiation belt energetic
electrons, which have drift periods of the same order. We will discuss
observations of ULF wave events as well as statistical studies of the
distribution of ULF waves, based on which we constructed models that
simulate the interaction of ULF waves with energetic particles. We
will also discuss the importance of knowledge of the azimuthal mode
numbers of ULF waves for wave-particle interactions, and will present
calculations of the waves’ mode numbers and phase velocities, as
performed from observations of phase-differences on the ground and in
space.
