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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Estimation of magnetospheric plasma ion composition for 1956–1975 by using high time resolution geomagnetic field data created from analog magnetograms
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Estimation of magnetospheric plasma ion composition for 1956–1975 by using high time resolution geomagnetic field data created from analog magnetograms

机译：估计磁性层的等离子体离子作文1956 - 1975年使用的时候地磁场数据创建的决议

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摘要

This study addresses the ion composition in the magnetosphere before the satellite era. We estimate the plasma ion mass for 1956–1975 from the period of low-latitude Pi2 pulsations found in digital geomagnetic field data that are created from analog magnetograms at Kakioka. The period of investigation covers most of solar cycle 19 and the whole solar cycle 20. To consider long-term variation, the moving average of the estimated plasma ion mass is calculated with a 1 year time window. We find that 1 year moving average of the plasma ion mass changed by a factor of ～2 during one solar cycle (i.e., between ～1.1 amu and ～2.4 amu for solar cycle 19 and between ～1.1 amu and ～2.0 amu for solar cycle 20). The correlation coefficient between the 1 year moving average of the plasma ion mass and that of the F_(10.7) index is 0.86. This result supports the idea that in long-term variation, solar radiation increases the density and the temperature of O~+ ions in the ionosphere, leads to the outflow of O~+ ions, and contributes to the enhancement of the plasma ion mass in the nightside magnetosphere. The digital data created from analog magnetograms provide an important clue to know the space environment in old days and are advantageous for studies of the space weather and space climate.
机译：本研究解决了离子组成的磁气圈卫星时代之前。1956 - 1975年估算等离子体离子质低纬度Pi2脉动发现的时期在数字地磁场数据从模拟创建Kakioka磁力图。调查涵盖了大部分的太阳能周期19和20整个太阳周期。考虑长期的变化,移动平均线的估计计算等离子体离子质1年的时间窗口。移动平均线的等离子体离子质改变~ 2倍在一个太阳活动周期(例如,~ 1.1之间阿姆河和太阳活动周期19 ~ 2.4阿姆河~ 1.1之间和阿姆河,~ 2.0阿姆太阳周期20)。年移动平均值的等离子体离子质量和f(10.7)的指数是0.86。支持这个想法,在长期的变化,太阳辐射密度和增加O ~ +离子的变化,温度线索O ~ +离子外流,导致的增强等离子体离子的质量阴面磁场。从模拟磁力图提供了一个重要的线索知道时光的空间环境有利的研究空间天气和气候空间。

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