Using mutual information to determine geoeffectiveness of solar wind phase fronts with different front orientations

Simple item page
dc.contributor.authorCameron, T. G.
dc.contributor.authorJackel, B. J.
dc.contributor.authorOliveira, D. M.
dc.date.accessioned2019-02-25T16:01:44Z
dc.date.available2019-02-25T16:01:44Z
dc.date.issued2019-02-04
dc.description.abstractThe geoeffectiveness of solar wind shocks depends on angle with respect to the Sun‐Earth line, with highly angled solar wind shocks being less geoeffective than nearly frontal solar wind shocks. However, it is unclear whether this holds for the orientation of structures in non‐shocked solar wind. In this paper, we perform a mutual information analysis of 18 years of in‐situ solar wind and ground magnetometer data in order to investigate the effects of solar wind phase front orientation on solar wind geoeffectiveness (indicated by SuperMAG SME). Since geomagnetic response is strongly influenced by Interplanetary Magnetic Field (IMF) Bz, and IMF Bz affects phase front orientation, we use conditional mutual information to account for the effect of Bz on geomagnetic activity. In contrast to what has been found for solar wind shocks, we find that during times of IMF Bz >0, phase fronts aligned with the average Parker spiral direction (45 deg azimuth, 0 deg inclination) tend to be associated with higher geomagnetic activity (SME >500 nT) than would be expected if IMF Bz and phase front orientation quantities were unrelated. During times of IMF Bz <0, there is no connection between solar wind phase front orientation and geomagnetic activity (SME). We believe that Parker spiral aligned phase fronts being associated with higher geomagnetic activity during times of IMF Bz > 0 is due to constant phase front orientation allowing for more efficient energy transfer either through viscous interaction or high latitude reconnection.en_US
dc.description.sponsorshipThis work was supported by Canad i an Space Agenc y Geospace Observation grant 14SUGOCGV. It was also supported by a NSERC Postgr a d u at e Schol- arship. D. M. O . acknowledges the NASA-SR grants 13-SRITM1 3 2-0011 and HSR -M AG14 2-0062 under contract with UMBC.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA026080en_US
dc.format.extent33 pagesen_US
dc.genrejournal articles postprintsen_US
dc.identifierdoi:10.13016/m2sgvm-cqw3
dc.identifier.citationT. G. Cameron, B. J. Jackel, D. M. Oliveira, Using mutual information to determine geoeffectiveness of solar wind phase fronts with different front orientations, Journal of Geophysical Research: Space Physics, 2019, https://doi.org/10.1029/2018JA026080en_US
dc.identifier.urihttps://doi.org/10.1029/2018JA026080
dc.identifier.urihttp://hdl.handle.net/11603/12857
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Goddard Planetary Heliophysics Institute (GPHI)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rights© 2018. American Geophysical Union. All Rights Reserved.
dc.subjectsolar wind magnetosphere couplingen_US
dc.subjectsolar wind structuresen_US
dc.subjectinformation theoryen_US
dc.titleUsing mutual information to determine geoeffectiveness of solar wind phase fronts with different front orientationsen_US
dc.typeTexten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Cameron_et_al-2019-Journal_of_Geophysical_Research__Space_Physics.pdf
Size:
519.03 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.56 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

UMBC Goddard Planetary Heliophysics Institute (GPHI)
UMBC Faculty Collection