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| Titel |
Generation of electromagnetic emission during the injection of dense supersonic plasma flows into arched magnetic field |
| VerfasserIn |
Mikhail Viktorov, Sergey Golubev, Dmitry Mansfeld, Alexander Vodopyanov |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250122600
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| Publikation (Nr.) |
 EGU/EGU2016-1670.pdf |
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| Zusammenfassung |
| Interaction of dense supersonic plasma flows with an inhomogeneous arched magnetic field is
one of the key problems in near-Earth and space plasma physics. It can influence on the
energetic electron population formation in magnetosphere of the Earth, movement of plasma
flows in magnetospheres of planets, energy release during magnetic reconnection, generation
of electromagnetic radiation and particle precipitation during solar flares eruption. Laboratory
study of this interaction is of big interest to determine the physical mechanisms
of processes in space plasmas and their detailed investigation under reproducible
conditions.
In this work a new experimental approach is suggested to study interaction of
supersonic (ion Mach number up to 2.7) dense (up to 1015 cm−3) plasma flows
with inhomogeneous magnetic field (an arched magnetic trap with a field strength
up to 3.3 T) which opens wide opportunities to model space plasma processes in
laboratory conditions. Fully ionized plasma flows with density from 1013 cm−3
to 1015 cm−3 are created by plasma generator on the basis of pulsed vacuum arc
discharge. Then plasma is injected in an arched open magnetic trap along or across
magnetic field lines. The filling of the arched magnetic trap with dense plasma
and further magnetic field lines break by dense plasma flow were experimentally
demonstrated.
The process of plasma deceleration during the injection of plasma flow across the
magnetic field lines was experimentally demonstrated. Pulsed plasma microwave emission at
the electron cyclotron frequency range was observed. It was shown that frequency spectrum
of plasma emission is determined by position of deceleration region in the magnetic field of
the magnetic arc, and is affected by plasma density. Frequency spectrum shifts to higher
frequencies with increasing of arc current (plasma density) because the deceleration region of
plasma flow moves into higher magnetic field. The observed emission can be related to the
cyclotron mechanism of generation by non-equilibrium energetic electrons in dense
plasma.
The reported study was funded by RFBR, according to the research project No.
16-32-60056 mol_a_dk. |
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