ap-index solar wind driving function and its semiannual variations

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ID: 218724
2007
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Abstract
Semiannual variation of geomagnetic activity and ap-index in particular is supposed to consist of heliospheric factor (axial hypothesis and Russell-McPherron effect) and magnetospheric/ionospheric factor (equinoctical hypothesis). In our investigation we express ap-index as a magnetospheric response function to solar wind and IMF input. Seasonal variation in ap-index on average (1963–2003) is ~4 nT and consists of ~2.1–2.3 nT of magnetospheric/ionospheric part, 0.6–1.3 nT of heliospheric part (including 0.2–0.3 nT of R-M effect), 0.1–0.4 nT is due to the non-linear term. 90% confidence range of all estimates is ~0.1–0.25 nT. While autumn/spring magnetospheric response functions are almost identical, there is substantial difference between winter and summer functions. The increase of solar wind input in autumn and spring is also different by a factor of two.
Reference Key
petrukovich2007annales<i>a<sub>p</sub></i>-index Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;A. A. Petrukovich;M. Y. Zakharov
Journal journal of food measurement and characterization
Year 2007
DOI
10.5194/angeo-25-1465-2007
URL
https://www.ann-geophys.net/25/1465/2007/angeo-25-1465-2007.pdf
Keywords
cosmic physics sciencephysicsgeophysics

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