{"title":"均质和连续分层大气中的 MHD 波","authors":"Paul S. Cally, Thomas J. Bogdan","doi":"arxiv-2408.01591","DOIUrl":null,"url":null,"abstract":"The basic equations, concepts, and modes of linear, ideal, MHD waves -- slow,\nAlfv\\'en and fast -- are set out and generalised to gravitationally-stratified\natmospheres. Particular attention is devoted to mode conversion, wherein the\nlocal behavior of a global wave changes from one mode to another in passing\nthrough particular atmospheric layers. Exact solutions are explored where\navailable. Eikonal methods -- WKBJ and ray theory -- are described. Although\nour emphasis is on the theoretical underpinning of the subject, the solar\natmospheric heating implications of fast/slow and fast/Alfv\\'en conversions are\ndiscussed in detail.","PeriodicalId":501423,"journal":{"name":"arXiv - PHYS - Space Physics","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"MHD waves in homogeneous and continuously stratified atmospheres\",\"authors\":\"Paul S. Cally, Thomas J. Bogdan\",\"doi\":\"arxiv-2408.01591\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The basic equations, concepts, and modes of linear, ideal, MHD waves -- slow,\\nAlfv\\\\'en and fast -- are set out and generalised to gravitationally-stratified\\natmospheres. Particular attention is devoted to mode conversion, wherein the\\nlocal behavior of a global wave changes from one mode to another in passing\\nthrough particular atmospheric layers. Exact solutions are explored where\\navailable. Eikonal methods -- WKBJ and ray theory -- are described. Although\\nour emphasis is on the theoretical underpinning of the subject, the solar\\natmospheric heating implications of fast/slow and fast/Alfv\\\\'en conversions are\\ndiscussed in detail.\",\"PeriodicalId\":501423,\"journal\":{\"name\":\"arXiv - PHYS - Space Physics\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-08-02\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"arXiv - PHYS - Space Physics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/arxiv-2408.01591\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Space Physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2408.01591","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
MHD waves in homogeneous and continuously stratified atmospheres
The basic equations, concepts, and modes of linear, ideal, MHD waves -- slow,
Alfv\'en and fast -- are set out and generalised to gravitationally-stratified
atmospheres. Particular attention is devoted to mode conversion, wherein the
local behavior of a global wave changes from one mode to another in passing
through particular atmospheric layers. Exact solutions are explored where
available. Eikonal methods -- WKBJ and ray theory -- are described. Although
our emphasis is on the theoretical underpinning of the subject, the solar
atmospheric heating implications of fast/slow and fast/Alfv\'en conversions are
discussed in detail.
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