ORCID: https://orcid.org/0000-0001-7741-682X; Daly, Patric W. und Zelenyi, Lev Matveevich
(2018):
Plasma Acceleration On Multiscale Temporal Variations Of Electric And Magnetic Fields During Substorm Dipolarization In The Earth's Magnetotail.
In: Annals of Geophysics, Vol. 61, No. 3, GM334
[PDF, 1MB]
Abstract
Magnetic field dipolarizations are often observed in the magnetotail during substornis. These generally include three temporal scales: (1) actual dipolarization when the normal magnetic field changes during several minutes from minimum to maximum level;(2) sharp B-z bursts (pulses) interpreted as the passage of multiple dipolarization fronts with characteristic time scales < 1 min, and (3) bursts of electric and magnetic fluctuations with frequencies up to electron gyrofrequency occurring at the smallest tune scales (<= 1 s). We present a numerical model where the contributions of the above processes (1)-(3) in particle acceleration are analyzed. It is shown that these processes have a resonant character at different temporal scales. While O+ ions are more likely accelerated due to the mechanism (1), H+ ions (and to some extent electrons) are effectively accelerated due to the second mechanism. High-frequency electric and magnetic fluctuations accompanying magnetic dipolarization as in (3) are also found to efficiently accelerate electrons.
Item Type: | Journal article |
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Faculties: | Geosciences > Department of Earth and Environmental Sciences |
Subjects: | 500 Science > 550 Earth sciences and geology |
URN: | urn:nbn:de:bvb:19-epub-67868-6 |
ISSN: | 1593-5213 |
Language: | English |
Item ID: | 67868 |
Date Deposited: | 19. Jul 2019 12:23 |
Last Modified: | 28. Mar 2025 06:44 |