Toward more reliable long‐term indices of geomagnetic activity: Correcting a new inhomogeneity problem in early geomagnetic data
For the time before the space era, our knowledge of the centennial evolution of solar wind
(SW) and interplanetary magnetic field (IMF) is based on proxies derived from geomagnetic
indices. The reliability of these proxies is dependent on the homogeneity of magnetic field
data. In this paper, we study the interhourly (IHV) and interdiurnal (IDV1d) variability indices
calculated from the data of two British observatories, Eskdalemuir and Lerwick, and compare
them to the corresponding indices of the German Niemegk observatory. We find an excess�…
(SW) and interplanetary magnetic field (IMF) is based on proxies derived from geomagnetic
indices. The reliability of these proxies is dependent on the homogeneity of magnetic field
data. In this paper, we study the interhourly (IHV) and interdiurnal (IDV1d) variability indices
calculated from the data of two British observatories, Eskdalemuir and Lerwick, and compare
them to the corresponding indices of the German Niemegk observatory. We find an excess�…
Towards more reliable long-term indices of geomagnetic activity: correcting a new inhomogeneity problem in early geomagnetic data
For the time before the space era our knowledge of the centennial evolution of solar wind
(SW) and interplanetary magnetic field (IMF) is based on proxies derived from geomagnetic
indices. The reliability of these proxies is dependent on the homogeneity of magnetic field
data. In this paper we study the interhourly (IHV) and interdiurnal (IDV_ {1d}) variability
indices calculated from the data of two British observatories, Eskdalemuir and Lerwick, and
compare them to the corresponding indices of the German Niemegk observatory. We find an�…
(SW) and interplanetary magnetic field (IMF) is based on proxies derived from geomagnetic
indices. The reliability of these proxies is dependent on the homogeneity of magnetic field
data. In this paper we study the interhourly (IHV) and interdiurnal (IDV_ {1d}) variability
indices calculated from the data of two British observatories, Eskdalemuir and Lerwick, and
compare them to the corresponding indices of the German Niemegk observatory. We find an�…
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