Dynamical effects of the parker instability in the interstellar medium

Shantanu Basu, Telemachos Ch Mouschovias, Efthimios V. Paleologou

Research output: Contribution to journalArticle

Abstract

We follow numerically the nonlinear evolution of the Parker instability in the interstellar medium in two spatial dimensions. The response of an initially unstable equilibrium state to small, random velocity perturbations is investigated. The horizontal wavelength with maximum growth rate in the linear theory grows preferentially and dominates the nonlinear evolution of the system during timescales of interest in the interstellar medium. The nonlinear evolution of the system also favors modes whose symmetry allows motions that cross the galactic plane. In a separate calculation, we investigate the dominant mode in more detail and discuss the effect of the nonlinear evolution on the structure of the interstellar medium.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume480
Issue number1 PART II
StatePublished - Jan 1 1997

Fingerprint

symmetry
perturbation
wavelength
timescale
effect
wavelengths
calculation

Keywords

  • ISM: clouds
  • ISM: magnetic fields
  • ISM: structure
  • Instabilities
  • MHD

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Dynamical effects of the parker instability in the interstellar medium. / Basu, Shantanu; Mouschovias, Telemachos Ch; Paleologou, Efthimios V.

In: Astrophysical Journal, Vol. 480, No. 1 PART II, 01.01.1997.

Research output: Contribution to journalArticle

Basu, Shantanu ; Mouschovias, Telemachos Ch ; Paleologou, Efthimios V. / Dynamical effects of the parker instability in the interstellar medium. In: Astrophysical Journal. 1997 ; Vol. 480, No. 1 PART II.
@article{9a2cd2f290014ccc9c794146c5703511,
title = "Dynamical effects of the parker instability in the interstellar medium",
abstract = "We follow numerically the nonlinear evolution of the Parker instability in the interstellar medium in two spatial dimensions. The response of an initially unstable equilibrium state to small, random velocity perturbations is investigated. The horizontal wavelength with maximum growth rate in the linear theory grows preferentially and dominates the nonlinear evolution of the system during timescales of interest in the interstellar medium. The nonlinear evolution of the system also favors modes whose symmetry allows motions that cross the galactic plane. In a separate calculation, we investigate the dominant mode in more detail and discuss the effect of the nonlinear evolution on the structure of the interstellar medium.",
keywords = "ISM: clouds, ISM: magnetic fields, ISM: structure, Instabilities, MHD",
author = "Shantanu Basu and Mouschovias, {Telemachos Ch} and Paleologou, {Efthimios V.}",
year = "1997",
month = "1",
day = "1",
language = "English (US)",
volume = "480",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 PART II",

}

TY - JOUR

T1 - Dynamical effects of the parker instability in the interstellar medium

AU - Basu, Shantanu

AU - Mouschovias, Telemachos Ch

AU - Paleologou, Efthimios V.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - We follow numerically the nonlinear evolution of the Parker instability in the interstellar medium in two spatial dimensions. The response of an initially unstable equilibrium state to small, random velocity perturbations is investigated. The horizontal wavelength with maximum growth rate in the linear theory grows preferentially and dominates the nonlinear evolution of the system during timescales of interest in the interstellar medium. The nonlinear evolution of the system also favors modes whose symmetry allows motions that cross the galactic plane. In a separate calculation, we investigate the dominant mode in more detail and discuss the effect of the nonlinear evolution on the structure of the interstellar medium.

AB - We follow numerically the nonlinear evolution of the Parker instability in the interstellar medium in two spatial dimensions. The response of an initially unstable equilibrium state to small, random velocity perturbations is investigated. The horizontal wavelength with maximum growth rate in the linear theory grows preferentially and dominates the nonlinear evolution of the system during timescales of interest in the interstellar medium. The nonlinear evolution of the system also favors modes whose symmetry allows motions that cross the galactic plane. In a separate calculation, we investigate the dominant mode in more detail and discuss the effect of the nonlinear evolution on the structure of the interstellar medium.

KW - ISM: clouds

KW - ISM: magnetic fields

KW - ISM: structure

KW - Instabilities

KW - MHD

UR - http://www.scopus.com/inward/record.url?scp=21744450005&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=21744450005&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:21744450005

VL - 480

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART II

ER -