{"title":"一种求取k个指标的改进fmi方法","authors":"WANG Jian-Jun, LI Qi, YANG Dong-Mei, LU Jing-Hui","doi":"10.1002/cjg2.30049","DOIUrl":null,"url":null,"abstract":"<p>The differences between the <i>K</i> indices derived with the FMI Method (V1.0) and the <i>Kp</i> indices were analyzed, four problems were found such as discrete <i>K</i><sub>1</sub> and <i>K</i><sub>8</sub> among different observatories, <i>K</i> indices about 0.5 larger than <i>Kp</i> indices, wrong <i>S</i><sub>R</sub> on several individual days, steps between <i>S</i><sub>R</sub> and its next day <i>S</i><sub>R</sub>. In order to resolve the above mentioned problems, we improved the FMI method of deriving <i>K</i> indices. The <i>K</i> indices derived with the improved FMI Method were compared with the <i>Kp</i> indices, the <i>K</i> indices derived with the original FMI Method and other methods as well, it was found that the <i>K</i> indices derived with the improved FMI Method were closer to the <i>Kp</i> indices and the <i>K</i> indices derived with other methods than the original FMI Method.</p>","PeriodicalId":100242,"journal":{"name":"Chinese Journal of Geophysics","volume":"60 4","pages":"321-332"},"PeriodicalIF":0.0000,"publicationDate":"2017-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/cjg2.30049","citationCount":"1","resultStr":"{\"title\":\"AN IMPROVED FMI METHOD OF DERIVING K INDICES\",\"authors\":\"WANG Jian-Jun, LI Qi, YANG Dong-Mei, LU Jing-Hui\",\"doi\":\"10.1002/cjg2.30049\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The differences between the <i>K</i> indices derived with the FMI Method (V1.0) and the <i>Kp</i> indices were analyzed, four problems were found such as discrete <i>K</i><sub>1</sub> and <i>K</i><sub>8</sub> among different observatories, <i>K</i> indices about 0.5 larger than <i>Kp</i> indices, wrong <i>S</i><sub>R</sub> on several individual days, steps between <i>S</i><sub>R</sub> and its next day <i>S</i><sub>R</sub>. In order to resolve the above mentioned problems, we improved the FMI method of deriving <i>K</i> indices. The <i>K</i> indices derived with the improved FMI Method were compared with the <i>Kp</i> indices, the <i>K</i> indices derived with the original FMI Method and other methods as well, it was found that the <i>K</i> indices derived with the improved FMI Method were closer to the <i>Kp</i> indices and the <i>K</i> indices derived with other methods than the original FMI Method.</p>\",\"PeriodicalId\":100242,\"journal\":{\"name\":\"Chinese Journal of Geophysics\",\"volume\":\"60 4\",\"pages\":\"321-332\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2017-12-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1002/cjg2.30049\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chinese Journal of Geophysics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/cjg2.30049\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Geophysics","FirstCategoryId":"1085","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/cjg2.30049","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
The differences between the K indices derived with the FMI Method (V1.0) and the Kp indices were analyzed, four problems were found such as discrete K1 and K8 among different observatories, K indices about 0.5 larger than Kp indices, wrong SR on several individual days, steps between SR and its next day SR. In order to resolve the above mentioned problems, we improved the FMI method of deriving K indices. The K indices derived with the improved FMI Method were compared with the Kp indices, the K indices derived with the original FMI Method and other methods as well, it was found that the K indices derived with the improved FMI Method were closer to the Kp indices and the K indices derived with other methods than the original FMI Method.
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