High-latitude ionospheric conductivity variability in three dimensions

McGranaghan, Ryan; Knipp, Delores J.; Matsuo, Tomoko

doi:10.1002/2016gl070253

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High-latitude ionospheric conductivity variability in three dimensions

2016
By McGranaghan, Ryan ; Knipp, Delores J. ; Matsuo, Tomoko
Source: Geophysical Research Letters, 43(15), 7867-7877.

[PDF-1.31 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

McGranaghan, Ryan ; Knipp, Delores J. ; Matsuo, Tomoko

McGranaghan, Ryan ; Knipp, Delores J. ; Matsuo, Tomoko Less -
NOAA Program & Office:

SWPC (Space Weather Prediction Center) ; NWS (National Weather Service) ; CIRES (Cooperative Institute for Research in Environmental Sciences)

SWPC (Space Weather Prediction Center) ; NWS (National Weather Service) ; CIRES (Cooperative Institute for Research in Environmental Sciences) Less -
Description:

We perform the first ever global-scale, altitude-dependent analysis of polar ionospheric conductivity variability using spectrally resolved in situ satellite particle measurements. With an empirical orthogonal function analysis we identify three primary modes of three-dimensional variability related to ionospheric footprints of the quiet and disturbed geospace environment: (1) perturbation of the quasi-permanent auroral oval, (2) differing projections of electron precipitation during southward and northward interplanetary magnetic field, and (3) a likely imprint of variation in Alfvenic Poynting flux deposition. Together, these modes account for >50% of the total conductivity variability throughout the E region ionosphere. Our results show that height-integrated conductance and height-dependent conductivities are distinctly different, underscoring the importance of studying the ionosphere in three dimensions. We provide the framework for future three-dimensional global analysis of ionosphere-magnetosphere coupling.
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Geophysical Research Letters, 43(15), 7867-7877.
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https://doi.org/10.1002/2016gl070253
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Journal Article
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urn:sha256:66896ad57be7118363311ddb29a0acaad34398794a7936136a4d10aac92c263f
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High-latitude ionospheric conductivity variability in three dimensions

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