Results of Russian geomagnetic observatories in the 19th century: magnetic activity, 1841–1862
Results of Russian geomagnetic observatories in the 19th century: magnetic activity, 1841–1862
复制标题
19 世纪俄罗斯地磁观测站的结果：磁活动，1841 年至 1862 年
DOI：
10.5194/angeo-28-917-2010
复制
发表时间：
2010
影响因子：
1.9
通讯作者：
L. Häkkinen
中科院分区：
文献类型：
--
作者：
H. Nevanlinna;L. Häkkinen
抽象。每小时（点读数）磁数据（H-和D-分量）是从俄罗斯年鉴表数字化的1850年至1862年从四个天文台。用普通数码相机拍摄数字化的pdf图片。所获得的数据库由大约90万个单一数据点组成。每小时的地磁值的时间序列揭示缓慢的长期变化（仅十月），以及外部起源的瞬变和规则的地磁变化。数据的质量和均匀性令人满意。每日的AK指数是使用指数算法计算的，该算法早先已应用于赫尔辛基（芬兰）的世纪数据以及现代地磁观测记录。根据俄罗斯数据得出的活动指数系列与1850 - 1862年的早期活动指数系列一致。在这项研究中得出的数字化索引数据系列，包括从俄罗斯天文台（彼得堡）提供的磁C9活动指数数据，可追溯到1841年。这些磁测数据非常适合于研究19世纪世纪空间天气的长期变化。
Abstract. Hourly (spot readings) magnetic data (H- and D-components) were digitized from Russian yearbook tables for the years 1850–1862 from four observatories. The pdf pictures for digitization were taken by a normal digital camera. The database obtained consists of about 900 000 single data points. The time series of hourly magnetic values reveal slow secular variations (declination only) as well as transient and regular geomagnetic variations of external origin. The quality and homogeneity of the data is satisfactory. Daily Ak-indices were calculated using the index algorithm that has been earlier applied to 19th century data from Helsinki (Finland) as well as modern magnetic observatory recordings. The activity index series derived from the Russian data is consistent with earlier activity index series for 1850–1862. The digitized index data series derived in this study was extended back to 1841 by including magnetic C9 activity index data available from a Russian observatory (St. Petersburg). Magnetic data rescued here is well suitable for various reconstructions for studies of the long-term variation of the space weather in the 19th century.