Swing wave-wave interaction: Coupling between fast magnetosonic and Alfven waves

T V  Zaqarashvili; B  Roberts

doi:10.1103/PhysRevE.66.026401

Swing wave-wave interaction: Coupling between fast magnetosonic and Alfven waves

T V Zaqarashvili, B Roberts

Applied Mathematics

Research output: Contribution to journal › Article › peer-review

Abstract

We suggest a mechanism of energy transformation from fast magnetosonic waves propagating across a magnetic field to Alfven waves propagating along the field. The mechanism is based on swing wave-wave interaction [T. V. Zaqarashvili, Astrophys. J. Lett. 552, 107 (2001)]. The standing fast magnetosonic waves cause a periodical variation in the Alfven speed, with the amplitude of an Alfven wave being governed by Mathieu's equation. Consequently, subharmonics of Alfven waves with a frequency half that of magnetosonic waves grow exponentially in time. It is suggested that the energy of nonelectromagnetic forces, which are able to support the magnetosonic oscillations, may be transmitted into the energy of purely magnetic oscillations. Possible astrophysical applications of the mechanism are briefly discussed.

Original language	English
Article number	026401
Number of pages	6
Journal	Physical Review. E, Statistical, nonlinear, and soft matter physics
Volume	66
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevE.66.026401
Publication status	Published - Aug 2002

Keywords

RESONANT ABSORPTION
CORONAL LOOPS
SHEAR FLOWS
FLUX TUBES
AMPLIFICATION
PROPAGATION

Access to Document

10.1103/PhysRevE.66.026401

Cite this

@article{eb9ec5e57e5a48a2947ddf6434c31852,

title = "Swing wave-wave interaction: Coupling between fast magnetosonic and Alfven waves",

abstract = "We suggest a mechanism of energy transformation from fast magnetosonic waves propagating across a magnetic field to Alfven waves propagating along the field. The mechanism is based on swing wave-wave interaction [T. V. Zaqarashvili, Astrophys. J. Lett. 552, 107 (2001)]. The standing fast magnetosonic waves cause a periodical variation in the Alfven speed, with the amplitude of an Alfven wave being governed by Mathieu's equation. Consequently, subharmonics of Alfven waves with a frequency half that of magnetosonic waves grow exponentially in time. It is suggested that the energy of nonelectromagnetic forces, which are able to support the magnetosonic oscillations, may be transmitted into the energy of purely magnetic oscillations. Possible astrophysical applications of the mechanism are briefly discussed.",

keywords = "RESONANT ABSORPTION, CORONAL LOOPS, SHEAR FLOWS, FLUX TUBES, AMPLIFICATION, PROPAGATION",

author = "Zaqarashvili, {T V} and B Roberts",

year = "2002",

month = aug,

doi = "10.1103/PhysRevE.66.026401",

language = "English",

volume = "66",

journal = "Physical Review. E, Statistical, nonlinear, and soft matter physics",

issn = "1539-3755",

publisher = "American Physical Society",

number = "2",

}

TY - JOUR

T1 - Swing wave-wave interaction

T2 - Coupling between fast magnetosonic and Alfven waves

AU - Zaqarashvili, T V

AU - Roberts, B

PY - 2002/8

Y1 - 2002/8

N2 - We suggest a mechanism of energy transformation from fast magnetosonic waves propagating across a magnetic field to Alfven waves propagating along the field. The mechanism is based on swing wave-wave interaction [T. V. Zaqarashvili, Astrophys. J. Lett. 552, 107 (2001)]. The standing fast magnetosonic waves cause a periodical variation in the Alfven speed, with the amplitude of an Alfven wave being governed by Mathieu's equation. Consequently, subharmonics of Alfven waves with a frequency half that of magnetosonic waves grow exponentially in time. It is suggested that the energy of nonelectromagnetic forces, which are able to support the magnetosonic oscillations, may be transmitted into the energy of purely magnetic oscillations. Possible astrophysical applications of the mechanism are briefly discussed.

AB - We suggest a mechanism of energy transformation from fast magnetosonic waves propagating across a magnetic field to Alfven waves propagating along the field. The mechanism is based on swing wave-wave interaction [T. V. Zaqarashvili, Astrophys. J. Lett. 552, 107 (2001)]. The standing fast magnetosonic waves cause a periodical variation in the Alfven speed, with the amplitude of an Alfven wave being governed by Mathieu's equation. Consequently, subharmonics of Alfven waves with a frequency half that of magnetosonic waves grow exponentially in time. It is suggested that the energy of nonelectromagnetic forces, which are able to support the magnetosonic oscillations, may be transmitted into the energy of purely magnetic oscillations. Possible astrophysical applications of the mechanism are briefly discussed.

KW - RESONANT ABSORPTION

KW - CORONAL LOOPS

KW - SHEAR FLOWS

KW - FLUX TUBES

KW - AMPLIFICATION

KW - PROPAGATION

U2 - 10.1103/PhysRevE.66.026401

DO - 10.1103/PhysRevE.66.026401

M3 - Article

SN - 1539-3755

VL - 66

JO - Physical Review. E, Statistical, nonlinear, and soft matter physics

JF - Physical Review. E, Statistical, nonlinear, and soft matter physics

IS - 2

M1 - 026401

ER -

Swing wave-wave interaction: Coupling between fast magnetosonic and Alfven waves

Abstract

Keywords

Access to Document

Fingerprint

Cite this