The Use of Geophysical Data in Studies of the Historical Solar-Terrestrial Environment |
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Authors: | M A Shea D F Smart |
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Institution: | (1) Emeritus Researchers at AFRL(VSBX), Hanscom AFB, Bedford, MA, 01731-3010, U.S.A. |
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Abstract: | Recent studies of the solar-terrestrial environment for the past 500 years have necessitated the use of a variety of historical
databases: nitrates in ice cores, knowledge of large volcanic eruptions, sunspot numbers, mid-latitude aurora and geomagnetic
records. The nitrate data are being used to identify large solar proton fluence events. The volcanic record helps to provide
time markers for the ice core. The records of major geomagnetic storms and mid-latitude aurora have been used for additional
identification. We also know that the Earth’s magnetic field is evolving with a present rapid decrease in magnitude. In addition
the wandering magnetic pole must be considered in ascertaining what was “mid latitude” in historic times versus “mid latitude”
in 2000. We illustrate how these databases are being used in recent studies of historic solar proton events. |
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