Alfven waves are easy: mode conversion in magnetic regions

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Alfven waves are shown to be readily generated by mode conversion from fast MHD waves reflecting off the steep atmospheric Alfven speed gradient in active region atmospheres. A simple analytic description of this process in terms of an `interaction integral indicates that it is spread over many vertical scale heights, and indeed fills the whole active region chromosphere for waves of moderate helioseismic degree el, even up to el=1000 or more. This suggests that active region chromospheres are Alfven wave factories.
Original languageEnglish
Title of host publicationProceedings of the First Asia-Pacific Solar Physics Meeting
EditorsArnab Rai Choudhuri, Dipankar Banerjee
Place of PublicationIndia
PublisherAstronomical Society of India
Pages221 - 227
Number of pages7
Volume2
ISBN (Print)9788192292601
Publication statusPublished - 2011
EventAsia-Pacific Solar Physics Meeting (APSPM 2011) - Indian institute of Astrophysics, Bangalore, India
Duration: 21 Mar 201124 Mar 2011
Conference number: 1st
https://www.iiap.res.in/meet/apspm/

Conference

ConferenceAsia-Pacific Solar Physics Meeting (APSPM 2011)
CountryIndia
CityBangalore
Period21/03/1124/03/11
Internet address

Cite this

Cally, P. S. (2011). Alfven waves are easy: mode conversion in magnetic regions. In A. R. Choudhuri, & D. Banerjee (Eds.), Proceedings of the First Asia-Pacific Solar Physics Meeting (Vol. 2, pp. 221 - 227). India: Astronomical Society of India.
Cally, Paul Stuart. / Alfven waves are easy: mode conversion in magnetic regions. Proceedings of the First Asia-Pacific Solar Physics Meeting. editor / Arnab Rai Choudhuri ; Dipankar Banerjee. Vol. 2 India : Astronomical Society of India, 2011. pp. 221 - 227
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Cally, PS 2011, Alfven waves are easy: mode conversion in magnetic regions. in AR Choudhuri & D Banerjee (eds), Proceedings of the First Asia-Pacific Solar Physics Meeting. vol. 2, Astronomical Society of India, India, pp. 221 - 227, Asia-Pacific Solar Physics Meeting (APSPM 2011), Bangalore, India, 21/03/11.

Alfven waves are easy: mode conversion in magnetic regions. / Cally, Paul Stuart.

Proceedings of the First Asia-Pacific Solar Physics Meeting. ed. / Arnab Rai Choudhuri; Dipankar Banerjee. Vol. 2 India : Astronomical Society of India, 2011. p. 221 - 227.

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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AB - Alfven waves are shown to be readily generated by mode conversion from fast MHD waves reflecting off the steep atmospheric Alfven speed gradient in active region atmospheres. A simple analytic description of this process in terms of an `interaction integral indicates that it is spread over many vertical scale heights, and indeed fills the whole active region chromosphere for waves of moderate helioseismic degree el, even up to el=1000 or more. This suggests that active region chromospheres are Alfven wave factories.

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Cally PS. Alfven waves are easy: mode conversion in magnetic regions. In Choudhuri AR, Banerjee D, editors, Proceedings of the First Asia-Pacific Solar Physics Meeting. Vol. 2. India: Astronomical Society of India. 2011. p. 221 - 227