An empirical model of ground-level geomagnetic perturbations

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dc.contributorVirginia Techen
dc.contributor.authorWeimer, Daniel R.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessed2014-01-31en
dc.date.accessioned2014-02-05T14:20:25Zen
dc.date.available2014-02-05T14:20:25Zen
dc.date.issued2013-03-01en
dc.description.abstractA new empirical model for predicting ground-level geomagnetic perturbations has been developed. This model is based on global measurements of the magnetic field at multiple stations in the Northern Hemisphere collected over an 8 year period, along with the simultaneous measurements of the interplanetary magnetic field (IMF). Variations in ionospheric conductivity are implicitly contained in the measurements used in the model's construction, including the solar F-10.7 index. Provided with the IMF, solar wind velocity, dipole tilt angle (for season), and F-10.7 index, this model computes all three vector components of the magnetic perturbations at specified locations. The model results are consistent with the corresponding maps of the ionospheric electric potential. Interestingly, maps of the vertical component have patterns that resemble maps of the overhead, ionospheric field-aligned currents. Comparisons of model calculations with measurements at different locations show very good results, particularly at low frequencies. There are random variations at higher frequencies that are not reproduced well with the model, but they tend to occur in proportion to the predicted levels. This model could be useful for providing regional forecasts of geomagnetic activity with an approximately 1 h lead time. Citation: Weimer, D. R. (2013), An empirical model of ground-level geomagnetic perturbations, Space Weather, 11, 107-120, doi:10.1002/swe.20030en
dc.description.sponsorshipNational Space Weather Program through NSF ATM-0817751en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationWeimer, D. R. (2013), An empirical model of ground-level geomagnetic perturbations, Space Weather, 11, 107-120, doi:10.1002/swe.20030en
dc.identifier.doihttps://doi.org/10.1002/swe.20030en
dc.identifier.issn1539-4956en
dc.identifier.urihttp://hdl.handle.net/10919/25323en
dc.identifier.urlhttp://onlinelibrary.wiley.com/doi/10.1002/swe.20030/pdfen
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectTranspolar potential saturationen
dc.subjectMagnetic coordinate systemen
dc.subjectSolar-winden
dc.subjectHigh-latitudesen
dc.subjectFieldsen
dc.subjectMagnetopauseen
dc.subjectPulsationsen
dc.subjectSurfaceen
dc.titleAn empirical model of ground-level geomagnetic perturbationsen
dc.title.serialSpace Weather-the International Journal of Research and Applicationsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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