{"id":8362,"date":"2023-04-28T09:34:25","date_gmt":"2023-04-28T00:34:25","guid":{"rendered":"https:\/\/www11.ieice.org\/cs\/ap\/wp\/?page_id=8362"},"modified":"2025-12-05T19:00:12","modified_gmt":"2025-12-05T10:00:12","slug":"cloud_attenuation","status":"publish","type":"page","link":"https:\/\/www.ieice.org\/cs\/ap\/misc\/denpan-db\/prop_model_db\/model_list\/cloud_attenuation\/","title":{"rendered":"\u96f2\u30fb\u9727\u306b\u3088\u308b\u4f1d\u642c\u640d\u5931\u30e2\u30c7\u30eb"},"content":{"rendered":"
<\/div>

<\/path><\/svg><\/i> \"Loading\"<\/p>

<\/div>(since 2025\/12\/5)<\/p>\n\n\n\n

\u30e2\u30c7\u30eb\u306e\u6982\u8981<\/h3>\n\n\n\n

\u3000\u96f2\u30fb\u9727\u306e\u4e2d\u3092\u4f1d\u642c\u3059\u308b\u96fb\u6ce2\u306f\u4f1d\u642c\u8ddd\u96e2\u306b\u5fdc\u3058\u3066\u4f1d\u642c\u640d\u5931\u3092\u53d7\u3051\u308b\uff0e\u4f1d\u642c\u640d\u5931\u306f\u6307\u6570\u95a2\u6570\u6e1b\u8870\u30e2\u30c7\u30eb\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\uff0c\u640d\u5931\u91cf\u306f\u4f1d\u642c\u8ddd\u96e2\u3068\u96f2\u30fb\u9727\u306e\u6c34\u5206\u542b\u6c34\u91cf\u306b\u3088\u308a\u8a08\u7b97\u3055\u308c\u308b\uff0e\u6b63\u78ba\u306a\u640d\u5931\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u306f\uff0c\u4f1d\u642c\u7d4c\u8def\u5185\u306e\u96f2\u30fb\u9727\u306e\u5206\u5e03\u3084\u6c34\u5206\u542b\u6c34\u91cf\u306e\u60c5\u5831\u304c\u5fc5\u8981\u3060\u304c\uff0c\u6c17\u8c61\u89b3\u6e2c\u30c7\u30fc\u30bf\u306b\u3088\u308b\u53c2\u7167\u5024\u3092\u7528\u3044\u308b\u4e8b\u3067\uff0c\u5e73\u5747\u7684\u306a\u640d\u5931\u3092\u8a08\u7b97\u3059\u308b\u4e8b\u3082\u53ef\u80fd\u3067\u3042\u308b\uff0e<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u6570\u5f0f<\/h3>\n\n\n\n

\u96fb\u6ce2\u304c\u96f2\u30fb\u9727\u306e\u4e2d\u3092\u901a\u904e\u3057\u305f\u5834\u5408\uff0c\u901a\u904e\u3057\u305f\u8ddd\u96e2\u306b\u6bd4\u4f8b\u3057\u305f\u900f\u904e\u640d\u5931\\(\\gamma_c\\) [dB\/km] \u304c\u767a\u751f\u3059\u308b\u30e2\u30c7\u30eb\u3067\u3042\u308b\uff0e\u640d\u5931\u4fc2\u6570\\(\\gamma_c\\) \u306f\u4ee5\u4e0b\u3067\u5b9a\u7fa9\u3055\u308c\u308b<\/p>\n\n\n\n

\\(
\\gamma_c (f, T) = K_l (f, T) M \\\\
\\tag{1}
\\)<\/p>\n\n\n\n

\u3053\u3053\u3067\u3001<\/p>\n\n\n\n

\u3000\\(M\\) : \u96f2\u306e\u6c34\u5206\u5bc6\u5ea6 [g\/m3<\/sup>]\n\n\n\n

\\(
K_l (f, T) = \\frac{0.819 f}{\\varepsilon” (1 + \\eta^2)} \\\\
\\tag{2}
\\)<\/p>\n\n\n\n

\\(
\\eta = \\frac{2 + \\varepsilon’}{\\varepsilon”} \\\\
\\tag{3}
\\)<\/p>\n\n\n\n

\\(
\\varepsilon” (f) = \\frac{f (\\varepsilon_0 – \\varepsilon_1)}{f_p \\left[ 1 + (f \/ f_p)^2 \\right]} + \\frac{f (\\varepsilon_1 – \\varepsilon_2)}{f_s \\left[ 1 + (f \/ f_s)^2 \\right]} \\\\
\\tag{4}
\\)
\\(
\\varepsilon’ (f) = \\frac{\\varepsilon_0 – \\varepsilon_1}{\\left[ 1 + (f \/ f_p)^2 \\right]} + \\frac{\\varepsilon_1 – \\varepsilon_2}{\\left[ 1 + (f \/ f_s)^2 \\right]} + \\varepsilon_2 \\\\
\\tag{5}
\\)<\/p>\n\n\n\n

\\(
\\varepsilon_0 = 77.66 + 103.3 (\\theta – 1) \\\\
\\tag{6}
\\)
\\(
\\varepsilon_1 = 0.0671 \\varepsilon_0 \\\\
\\tag{7}
\\)
\\(
\\varepsilon_2 = 3.52 \\\\
\\tag{8}
\\)
\\(
\\theta = \\frac{300}{T} \\\\
\\tag{9}
\\)
\\(
f_p = 20.20 – 146 (\\theta – 1) + 316 (\\theta – 1)^2 \\\\
\\tag{10}
\\)
\\(
f_s = 39.8 f_p \\\\
\\tag{11}
\\)<\/p>\n\n\n\n

\u30d1\u30e9\u30e1\u30fc\u30bf<\/h3>\n\n\n\n
\u8a18\u53f7<\/td>\u30d1\u30e9\u30e1\u30fc\u30bf\u8aac\u660e[\u5358\u4f4d]<\/td><\/tr>
\\(f\\)<\/td>\u642c\u9001\u6ce2\u5468\u6ce2\u6570 [GHz] \u203b200 GHz\u4ee5\u4e0b<\/td><\/tr>
\\(T\\)<\/td>\u6e29\u5ea6 [K]<\/td><\/tr>
\\(M\\)<\/td>\u96f2\u306e\u6c34\u5206\u5bc6\u5ea6 [g\/m3<\/sup>]<\/td><\/tr>
\\(d\\)<\/td>\u4f1d\u642c\u8ddd\u96e2 [km]<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u203b \u96f2\u306e\u6c34\u5206\u5bc6\u5ea6\u306b\u3064\u3044\u3066\u306f\u5b9f\u6e2c\u5024\u304c\u5fc5\u8981
\u203b \u5b9f\u6e2c\u5024\u304c\u306a\u3044\u5834\u5408\uff0cEuropean Centre for Medium-Range Weather Forecasts (ECMWF)\u306eERA-40\u30c7\u30fc\u30bf\u3092\u5229\u7528\u3067\u304d\u308b ( https:\/\/www.itu.int\/rec\/R-REC-P.840-8-201908-I\/en<\/a> )<\/p>\n\n\n\n

\u8a08\u7b97\u4f8b<\/h3>\n\n\n
\n
\"\"<\/figure><\/div>\n\n\n

\u30fb\u9727\uff1a\u6c34\u5206\u91cf\u304b\u306a\u308a\u4f4e\u3044\u4f8b (\u8996\u754c300 m)
\u30fb\u96f2\uff1a\u6c34\u5206\u91cf\u304b\u306a\u308a\u9ad8\u3044\u4f8b<\/p>\n\n\n\n

\u53c2\u7167<\/h2>\n\n\n\n[1] \u660e\u5c71 \u54f2 (\u8457), \u4f0a\u85e4 \u6cf0\u5b8f (\u8457), \u4e95\u539f \u4fca\u592b (\u8457), \u5c0f\u5ddd \u82f1\u4e00 (\u8457, \u7de8\u96c6), \u5510\u6ca2 \u597d\u7537 (\u8457, \u7de8\u96c6), \u6cb3\u5d0e \u5584\u4e00\u90ce (\u8457), & 8 \u305d\u306e\u4ed6, \u201c\u96fb\u6ce2\u4f1d\u642c\u30cf\u30f3\u30c9\u30d6\u30c3\u30af,\u201d \u30ea\u30a2\u30e9\u30a4\u30ba\u7406\u5de5\u30bb\u30f3\u30bf\u30fc. 1994.<\/p>\n\n\n\n[2] ITU-R Recommendation P.840-8, \u201cAttenuation due to clouds and fog\u201d, ITU-R, 2019.<\/p>\n","protected":false},"excerpt":{"rendered":"

\u30e2\u30c7\u30eb\u306e\u6982\u8981 \u3000\u96f2\u30fb\u9727\u306e\u4e2d\u3092\u4f1d\u642c\u3059\u308b\u96fb\u6ce2\u306f\u4f1d\u642c\u8ddd\u96e2\u306b\u5fdc\u3058\u3066\u4f1d\u642c\u640d\u5931\u3092\u53d7\u3051\u308b\uff0e\u4f1d\u642c\u640d\u5931\u306f\u6307\u6570\u95a2\u6570\u6e1b\u8870\u30e2\u30c7\u30eb\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u304a\u308a\uff0c\u640d\u5931\u91cf\u306f\u4f1d\u642c\u8ddd\u96e2\u3068\u96f2\u30fb\u9727\u306e\u6c34\u5206\u542b\u6c34\u91cf\u306b\u3088\u308a\u8a08\u7b97\u3055\u308c\u308b\uff0e\u6b63\u78ba\u306a\u640d\u5931\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u306f\uff0c\u4f1d\u642c\u7d4c\u8def\u5185\u306e\u96f2 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":12073,"menu_order":46,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-8362","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8362","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/comments?post=8362"}],"version-history":[{"count":16,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8362\/revisions"}],"predecessor-version":[{"id":14881,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/8362\/revisions\/14881"}],"up":[{"embeddable":true,"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/pages\/12073"}],"wp:attachment":[{"href":"https:\/\/www.ieice.org\/cs\/ap\/wp-json\/wp\/v2\/media?parent=8362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}