中国地磁台网的K指数测量结果分析  

Analysis of measured K indices in geomagnetic observatory network of China

作　　者：程安龙[1] 周锦屏[1] 黄蔚北[1] 赵永芬[1] 赵学敏[1] 

机构地区：[1]国家地震局地球物理研究所

出　　处：《地震地磁观测与研究》1998年第2期48-55,共8页Seismological and Geomagnetic Observation and Research

基　　金：地震科学联合基金

摘　　要：Ｋ指数以０，１，……，９的数字分为１０级，以３小时为一时段，简单、直观、清晰地表示出地磁场受太阳微粒辐射而形成的扰动变化的程度。Ｋ指数测量是地磁台日常工作的重要内容之一。正确地区别Ｋ变化与非Ｋ变化是测量Ｋ指数的基本要求和关键所在。我国地磁台站从１９８９年开始用规则日变化ＳＲ代替“铁曲线”来识别Ｋ变化与非Ｋ变化，使测量方法与国际上的通行做法相一致。本文通过对我国地磁台站的Ｋ频次分布统计指出，在采用新的测量方法以后，我国地磁台站的Ｋ指数测量的总体水平逐年提高，但各台站之间的测量水平有一定的差距，特别是在磁场平静或扰动不大，需要仔细识别ＳＲ变化时，有的台站将ＳＲ估计过大，使Ｋ值偏向低Ｋ端；有的又将ＳＲ估计过小，使Ｋ值偏向高Ｋ端；有的则表现为识别水平的不稳定。因此，正确地识别ＳＲ仍然是今后Ｋ指数测量中必须重视的问题。K indices is divided into 10 classes by 0,1,…,9.It shows simply,directly and clearly the disturbed degree of geomagnetic field due to particle radiation from the sun.The measurement of K indices is an important task in normal operation of geomagnetic observatory.The correct distinguish between K variation and no K variation is a basic requirement and key thing.Regular variation S R is applied in distinguish between K variation and no K variation instead of “iron” curve in geomagnetic observatory in China since 1989.The method agrees with international current method henceforth.The paper points that the general measuring level of K indices in geomagnetic observatory of China is improved step by step and year by year,but there is some difference between observatories.In quiet and quasi quiet days while S R should be distinguished carefully,the evaluation of S R is greater and K indices tend to be lower in some observatories,the evaluation of S R is smaller and K indices tend to be higher in other some observatories,and the evaluation S R is not stable in some observatories.Therefore correct distinguish of S R is still very important and we must pay attention to it in our observatories hereafter.

关 键 词：K指数 地磁变化 K变化 地磁台网 测量结果 

分 类 号：P318.6[天文地球—固体地球物理学]