Spatial Variation in the Responses of the Surface External and Induced Magnetic Field to the Solar Wind
Spatial Variation in the Responses of the Surface External and Induced Magnetic Field to the Solar Wind
复制标题
地表外部磁场和感应磁场对太阳风响应的空间变化
DOI:
10.1029/2019ja026543
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Shore R
中科院分区:
文献类型:
--
作者:
Shore R
We analyze the spatial variation in the response of the surface geomagnetic field (or the equivalent ionospheric current) to variations in the solar wind. Specifically, we regress a reanalysis of surface external and induced magnetic field (SEIMF) variations onto measurements of the solar wind. The regression is performed in monthly sets, independently for 559 regularly spaced locations covering the entire northern polar region above 50° magnetic latitude. At each location, we find the lag applied to the solar wind data that maximizes the correlation with the SEIMF. The resulting spatial maps of these independent lags and regression coefficients provide a model of the localized SEIMF response to variations in the solar wind, which we call “Spatial Information from Distributed Exogenous Regression.” We find that the lag and regression coefficients vary systematically with ionospheric region, season, and solar wind driver. In the polar cap region the SEIMF is best described by theBycomponent of the interplanetary magnetic field (50–75% of total variance explained) at a lag ∼20–25 min. Conversely, in the auroral zone the SEIMF is best described by the solar windϵfunction (60–80% of total variance explained), with a lag that varies with season and magnetic local time (MLT), from ∼15–20 min for dayside and afternoon MLT (except in Oct–Dec) to typically 30–40 min for nightside and morning MLT and even longer (60–65 min) around midnight MLT.
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影响因子:
3.7
作者:
D. Knipp
通讯作者:
D. Knipp
DOI:
10.1029/2019sw002161
发表时间:
2019-07
期刊:
Space Weather
影响因子:
--
作者:
R. Shore;M. Freeman;Jesper Gjerloev
通讯作者:
R. Shore;M. Freeman;Jesper Gjerloev
DOI:
--
发表时间:
2016
期刊:
Earth, Planets and Space
影响因子:
--
作者:
K. Laundal;C. Finlay;N. Olsen
通讯作者:
N. Olsen
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
C. Stolle;N. Olsen;A. Richmond;H. Opgenoorth
通讯作者:
H. Opgenoorth
影响因子:
10.3
作者:
C. Finlay;V. Lesur;E. Thébault;F. Vervelidou;A. Morschhauser;R. Shore
通讯作者:
C. Finlay;V. Lesur;E. Thébault;F. Vervelidou;A. Morschhauser;R. Shore