{"id":209116,"date":"2024-03-21T14:06:04","date_gmt":"2024-03-21T14:06:04","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%82%a2%e3%83%ab%e3%83%b4%e3%82%a7%e3%83%bc%e3%83%b3%e6%b3%a2%e3%81%ae%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81-%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8\/"},"modified":"2024-05-17T15:07:27","modified_gmt":"2024-05-17T15:07:27","slug":"%e3%82%a2%e3%83%ab%e3%83%b4%e3%82%a7%e3%83%bc%e3%83%b3%e6%b3%a2%e3%81%ae%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81-%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e3%82%a2%e3%83%ab%e3%83%b4%e3%82%a7%e3%83%bc%e3%83%b3%e6%b3%a2%e3%81%ae%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81-%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8\/","title":{"rendered":"\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u65b9\u7a0b\u5f0f | \u6982\u8981, \u8a08\u7b97\u65b9\u6cd5 &#038; \u5fdc\u7528"},"content":{"rendered":"<p class=\"sidekick\">\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306f\u3001\u78c1\u5834\u3068\u30d7\u30e9\u30ba\u30de\u306e\u76f8\u4e92\u4f5c\u7528\u3067\u751f\u3058\u308b\u6ce2\u3002\u7269\u7406\u5b66\u3084\u5de5\u5b66\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3001\u5b87\u5b99\u7269\u7406\u5b66\u306a\u3069\u306e\u5206\u91ce\u3067\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u65b9\u7a0b\u5f0f | \u6982\u8981, \u8a08\u7b97\u65b9\u6cd5 &#038; \u5fdc\u7528<\/h2>\n<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\uff08Alfv\u00e9n wave\uff09\u306f\u3001\u78c1\u5834\u3068\u30d7\u30e9\u30ba\u30de\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u3088\u3063\u3066\u4f1d\u308f\u308b\u6ce2\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u30021942\u5e74\u306b\u30b9\u30a6\u30a7\u30fc\u30c7\u30f3\u306e\u7269\u7406\u5b66\u8005\u3001\u30cf\u30f3\u30b9\u30fb\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u306b\u3088\u3063\u3066\u7406\u8ad6\u4ed8\u3051\u3089\u308c\u305f\u3053\u306e\u6ce2\u306f\u3001\u5b87\u5b99\u7269\u7406\u5b66\u3001\u5929\u4f53\u7269\u7406\u5b66\u3001\u305d\u3057\u3066\u30d7\u30e9\u30ba\u30de\u7269\u7406\u5b66\u306a\u3069\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u65b9\u7a0b\u5f0f\u306e\u6982\u8981\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u305d\u3057\u3066\u305d\u306e\u5fdc\u7528\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u6982\u8981<\/h2>\n<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306f\u3001\u78c1\u5834\u4e2d\u306e\u5c0e\u96fb\u6027\u6d41\u4f53\uff08\u30d7\u30e9\u30ba\u30de\uff09\u304c\u632f\u52d5\u3059\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u751f\u3058\u308b\u6ce2\u3067\u3059\u3002\u3053\u306e\u6ce2\u304c\u4f1d\u64ad\u3059\u308b\u901f\u5ea6\u306f\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u901f\u5ea6\u3068\u547c\u3070\u308c\u3001\u4ee5\u4e0b\u306e\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[ v_A = \\frac{B}{\\sqrt{\\mu_0 \\rho}} \\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001\\( v_A \\) \u306f\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u901f\u5ea6\u3001\\( B \\) \u306f\u78c1\u5834\u306e\u5f37\u3055\u3001\\( \\mu_0 \\) \u306f\u771f\u7a7a\u306e\u900f\u78c1\u7387\u3001\\( \\rho \\) \u306f\u30d7\u30e9\u30ba\u30de\u306e\u8cea\u91cf\u5bc6\u5ea6\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u65b9\u7a0b\u5f0f<\/h2>\n<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u57fa\u672c\u7684\u306a\u65b9\u7a0b\u5f0f\u306f\u3001\u958b\u653e\u6d41\u4f53\u529b\u5b66\u3068\u30de\u30af\u30b9\u30a6\u30a7\u30eb\u306e\u65b9\u7a0b\u5f0f\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u306b\u3088\u3063\u3066\u5f97\u3089\u308c\u307e\u3059\u3002\u305d\u308c\u306f\u6b21\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<p>\n\\[ \\frac{\\partial^2 \\mathbf{u}}{\\partial t^2} = v_A^2 \\nabla^2 \\mathbf{u} \\]\n<\/p>\n<p>\u3053\u3053\u3067\u3001\\( \\mathbf{u} \\) \u306f\u901f\u5ea6\u30d9\u30af\u30c8\u30eb\u3001\\( t \\) \u306f\u6642\u9593\u3001\\( \\nabla \\) \u306f\u30e9\u30d7\u30e9\u30b7\u30a2\u30f3\u6f14\u7b97\u5b50\u3067\u3059\u3002\u3053\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u6ce2\u306e\u4f1d\u64ad\u304c\u6d41\u4f53\u306e\u52d5\u304d\u3068\u78c1\u5834\u306e\u5909\u52d5\u306b\u3088\u3063\u3066\u3069\u306e\u3088\u3046\u306b\u5f71\u97ff\u3092\u53d7\u3051\u308b\u304b\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u89e3\u6790\u306b\u306f\u3044\u304f\u3064\u304b\u306e\u30b9\u30c6\u30c3\u30d7\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u4e00\u822c\u7684\u306a\u8a08\u7b97\u65b9\u6cd5\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li><b>\u521d\u671f\u6761\u4ef6\u306e\u8a2d\u5b9a\uff1a<\/b>\u30d7\u30e9\u30ba\u30de\u306e\u521d\u671f\u5bc6\u5ea6\u3001\u521d\u671f\u901f\u5ea6\u3001\u521d\u671f\u78c1\u5834\u3092\u6c7a\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li><b>\u65b9\u7a0b\u5f0f\u306e\u89e3\u6cd5\uff1a<\/b>\u5dee\u5206\u6cd5\u3084\u6709\u9650\u8981\u7d20\u6cd5\u306a\u3069\u306e\u6570\u5024\u89e3\u6790\u624b\u6cd5\u3092\u7528\u3044\u3066\u3001\u6642\u9593\u3084\u7a7a\u9593\u306b\u4f9d\u5b58\u3059\u308b\u6ce2\u52d5\u65b9\u7a0b\u5f0f\u3092\u89e3\u304d\u307e\u3059\u3002<\/li>\n<li><b>\u7d50\u679c\u306e\u89e3\u6790\uff1a<\/b>\u5f97\u3089\u308c\u305f\u30c7\u30fc\u30bf\u3092\u7528\u3044\u3066\u6ce2\u306e\u4f1d\u64ad\u901f\u5ea6\u3084\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u5206\u5e03\u306a\u3069\u3092\u89e3\u6790\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u5fdc\u7528<\/h2>\n<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306f\u69d8\u3005\u306a\u5206\u91ce\u3067\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u6319\u3052\u307e\u3059\uff1a<\/p>\n<ul>\n<li><b>\u5b87\u5b99\u7269\u7406\u5b66\uff1a<\/b>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306f\u592a\u967d\u98a8\u3084\u30aa\u30fc\u30ed\u30e9\u306e\u5f62\u6210\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002\u307e\u305f\u3001\u5b87\u5b99\u63a2\u67fb\u6a5f\u3084\u4eba\u5de5\u885b\u661f\u306e\u8a2d\u8a08\u306b\u3082\u95a2\u4e0e\u3057\u3066\u3044\u307e\u3059\u3002<\/li>\n<li><b>\u5929\u4f53\u7269\u7406\u5b66\uff1a<\/b>\u661f\u9593\u78c1\u5834\u3084\u9280\u6cb3\u7cfb\u306e\u78c1\u5834\u306e\u7814\u7a76\u306b\u304a\u3044\u3066\u3001\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u6319\u52d5\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/li>\n<li><b>\u30d7\u30e9\u30ba\u30de\u7269\u7406\u5b66\uff1a<\/b>\u6838\u878d\u5408\u7814\u7a76\u3084\u30d7\u30e9\u30ba\u30de\u52a0\u901f\u5668\u306e\u8a2d\u8a08\u306b\u304a\u3044\u3066\u3001\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u6319\u52d5\u306f\u91cd\u8981\u306a\u7814\u7a76\u5bfe\u8c61\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u78c1\u5834\u3068\u30d7\u30e9\u30ba\u30de\u304c\u76f8\u4e92\u4f5c\u7528\u3059\u308b\u904e\u7a0b\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u305d\u306e\u89e3\u6790\u3068\u5fdc\u7528\u306f\u3001\u79d1\u5b66\u6280\u8853\u306e\u767a\u5c55\u306b\u304a\u3044\u3066\u5927\u3044\u306b\u5bc4\u4e0e\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u304b\u3089\u3082\u3001\u3053\u306e\u6ce2\u52d5\u73fe\u8c61\u306b\u3064\u3044\u3066\u3055\u3089\u306b\u6df1\u3044\u7406\u89e3\u304c\u9032\u3080\u3053\u3068\u3067\u3001\u65b0\u305f\u306a\u767a\u898b\u3084\u6280\u8853\u9769\u65b0\u304c\u671f\u5f85\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30a2\u30eb\u30f4\u30a7\u30fc\u30f3\u6ce2\u306f\u3001\u78c1\u5834\u3068\u30d7\u30e9\u30ba\u30de\u306e\u76f8\u4e92\u4f5c\u7528\u3067\u751f\u3058\u308b\u6ce2\u3002\u7269\u7406\u5b66\u3084\u5de5\u5b66\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3001\u5b87\u5b99\u7269\u7406\u5b66\u306a\u3069\u306e\u5206\u91ce\u3067\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209116","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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