Reflection and conversion of magnetogravity waves in the solar chromosphere: windows to the upper atmosphere

Marie Elizabeth Newington, Paul Stuart Cally

Research output: Contribution to journalArticleResearchpeer-review

21 Citations (Scopus)

Abstract

The detection of upward propagating internal gravity waves at the base of the Suna??s chromosphere has recently been reported by Straus et al., who postulated that these may efficiently couple to AlfvA en waves in magnetic regions. This may be important in transporting energy to higher levels. Here we explore the propagation, reflection and mode conversion of linear gravity waves in a model atmosphere and find that even weak magnetic fields usually reflect gravity waves back downwards as slow magnetoacoustic waves well before they reach the AlfvA en/acoustic equipartition height at which mode conversion might occur. However, for certain highly inclined magnetic field orientations in which the gravity waves manage to penetrate near or through the equipartition level, there can be substantial conversion to either or both up-going AlfvA en and acoustic waves. Wave-energy fluxes comparable to the chromospheric radiative losses are expected.
Original languageEnglish
Pages (from-to)386 - 394
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume402
Publication statusPublished - 2010

Cite this

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title = "Reflection and conversion of magnetogravity waves in the solar chromosphere: windows to the upper atmosphere",
abstract = "The detection of upward propagating internal gravity waves at the base of the Suna??s chromosphere has recently been reported by Straus et al., who postulated that these may efficiently couple to AlfvA en waves in magnetic regions. This may be important in transporting energy to higher levels. Here we explore the propagation, reflection and mode conversion of linear gravity waves in a model atmosphere and find that even weak magnetic fields usually reflect gravity waves back downwards as slow magnetoacoustic waves well before they reach the AlfvA en/acoustic equipartition height at which mode conversion might occur. However, for certain highly inclined magnetic field orientations in which the gravity waves manage to penetrate near or through the equipartition level, there can be substantial conversion to either or both up-going AlfvA en and acoustic waves. Wave-energy fluxes comparable to the chromospheric radiative losses are expected.",
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Reflection and conversion of magnetogravity waves in the solar chromosphere: windows to the upper atmosphere. / Newington, Marie Elizabeth; Cally, Paul Stuart.

In: Monthly Notices of the Royal Astronomical Society, Vol. 402, 2010, p. 386 - 394.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Reflection and conversion of magnetogravity waves in the solar chromosphere: windows to the upper atmosphere

AU - Newington, Marie Elizabeth

AU - Cally, Paul Stuart

PY - 2010

Y1 - 2010

N2 - The detection of upward propagating internal gravity waves at the base of the Suna??s chromosphere has recently been reported by Straus et al., who postulated that these may efficiently couple to AlfvA en waves in magnetic regions. This may be important in transporting energy to higher levels. Here we explore the propagation, reflection and mode conversion of linear gravity waves in a model atmosphere and find that even weak magnetic fields usually reflect gravity waves back downwards as slow magnetoacoustic waves well before they reach the AlfvA en/acoustic equipartition height at which mode conversion might occur. However, for certain highly inclined magnetic field orientations in which the gravity waves manage to penetrate near or through the equipartition level, there can be substantial conversion to either or both up-going AlfvA en and acoustic waves. Wave-energy fluxes comparable to the chromospheric radiative losses are expected.

AB - The detection of upward propagating internal gravity waves at the base of the Suna??s chromosphere has recently been reported by Straus et al., who postulated that these may efficiently couple to AlfvA en waves in magnetic regions. This may be important in transporting energy to higher levels. Here we explore the propagation, reflection and mode conversion of linear gravity waves in a model atmosphere and find that even weak magnetic fields usually reflect gravity waves back downwards as slow magnetoacoustic waves well before they reach the AlfvA en/acoustic equipartition height at which mode conversion might occur. However, for certain highly inclined magnetic field orientations in which the gravity waves manage to penetrate near or through the equipartition level, there can be substantial conversion to either or both up-going AlfvA en and acoustic waves. Wave-energy fluxes comparable to the chromospheric radiative losses are expected.

UR - http://www3.interscience.wiley.com/cgi-bin/fulltext/123191598/PDFSTART

M3 - Article

VL - 402

SP - 386

EP - 394

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

ER -