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dc.contributor.authorOppenheim, Meers M.en_US
dc.contributor.authorDimant, Yakov S.en_US
dc.date.accessioned2018-04-02T16:43:48Z
dc.date.available2018-04-02T16:43:48Z
dc.date.issued2016-04-28
dc.identifierhttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000378338800003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=6e74115fe3da270499c3d65c9b17d654
dc.identifier.citationMeers M Oppenheim, Yakov S Dimant. 2016. "Photoelectron-induced waves: A likely source of 150 km radar echoes and enhanced electron modes." Geophysical Research Letters, Volume 43, Issue 8, pp. 3637 - 3644 (8).
dc.identifier.issn0094-8276
dc.identifier.issn1944-8007
dc.identifier.urihttps://hdl.handle.net/2144/27912
dc.description.abstractVHF radars near the geomagnetic equator receive coherent reflections from plasma density irregularities between 130 and 160 km in altitude during the daytime. Though researchers first discovered these 150 km echoes over 50 years ago and use them to monitor vertical plasma drifts, the underlying mechanism that creates them remains a mystery. This paper uses large‐scale kinetic simulations to show that photoelectrons can drive electron waves, which then enhance ion density irregularities that radars could observe as 150 km echoes. This model explains why 150 km echoes exist only during the day and why they appear at their lowest altitudes near noon. It predicts the spectral structure observed by Chau (2004) and suggests observations that can further evaluate this mechanism. It also shows the types and strength of electron modes that photoelectron‐wave interactions generate in a magnetized plasma.en_US
dc.description.sponsorshipThe authors would like to thank Juha Vierinen, David Hysell, Jorge Chau, and Roger Varney for their helpful discussions and suggestions. This material is based upon work supported by NASA under grant NNX14AI13G. This work used the XSEDE and TACC computational facilities, supported by National Science Foundation grant ACI-1053575. Simulation-produced data are archived at TACC and available upon request. (NNX14AI13G - NASA; ACI-1053575 - National Science Foundation)en_US
dc.format.extent3637 - 3644 (8)en_US
dc.languageEnglish
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofGeophysical Research Letters
dc.subjectScience & technologyen_US
dc.subjectPhysical sciencesen_US
dc.subjectGeosciences, multidisciplinaryen_US
dc.subjectGeologyen_US
dc.subjectFarley-Buneman turbulenceen_US
dc.subjectIonosphereen_US
dc.subjectSimulationsen_US
dc.subjectJicamarcaen_US
dc.subjectMeteorology & atmospheric sciencesen_US
dc.titlePhotoelectron-induced waves: A likely source of 150 km radar echoes and enhanced electron modesen_US
dc.typeArticleen_US
dc.identifier.doi10.1002/2016GL068179
pubs.elements-sourceweb-of-scienceen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
pubs.publication-statusPublisheden_US
dc.identifier.orcid0000-0002-8581-6177 (Oppenheim, Meers M)


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