RECORD DETAIL


Back To Previous

UPA Perpustakaan Universitas Jember

Nonlinear whistler wave model for lion roars in the Earth’s magnetosheath

No image available for this title
In the present study, we construct a nonlinear
whistler wave model to explain the magnetic field spectra
observed for lion roars in the Earth’s magnetosheath region.
We use two-fluid theory and semi-analytical approach to de-
rive the dynamical equation of whistler wave propagating
along the ambient magnetic field. We examine the magnetic
field localization of parallel propagating whistler wave in
the intermediate beta plasma applicable to the Earth’s mag-
netosheath. In addition, we investigate spectral features of
the magnetic field fluctuations and the spectral slope value.
The magnetic field spectrum obtained by semi-analytical ap-
proach shows a spectral break point and becomes steeper at
higher wave numbers. The observations of IMP 6 plasma
waves and magnetometer experiment reveal the existence
of short period magnetic field fluctuations in the magne-
tosheath. The observation shows the broadband spectrum
with a spectral slope of −4.5 superimposed with a narrow
band peak. The broadband fluctuations appear due to the en-
ergy cascades attributed by low-frequency magnetohydro-
dynamic modes, whereas, a narrow band peak is observed
due to the short period lion roars bursts. The energy spec-
trum predicted by the present theoretical model shows a sim-
ilar broadband spectrum in the wave number domain with a
spectral slope of −3.2, however, it does not show any nar-
row band peak. Further, we present a comparison between
theoretical energy spectrum and the observed spectral slope
in the frequency domain. The present semi-analytical model
provides exposure to the whistler wave turbulence in the
Earth’s magnetosheath.

Availability
EB00000004091KAvailable
Detail Information

Series Title

-

Call Number

-

Publisher

: ,

Collation

-

Language

ISBN/ISSN

-

Classification

NONE

Detail Information

Content Type

E-Jurnal

Media Type

-

Carrier Type

-

Edition

-

Specific Detail Info

-

Statement of Responsibility

No other version available