G
Gregory G. Howes
Researcher at University of Iowa
Publications - 165
Citations - 9021
Gregory G. Howes is an academic researcher from University of Iowa. The author has contributed to research in topics: Turbulence & Solar wind. The author has an hindex of 47, co-authored 159 publications receiving 7977 citations. Previous affiliations of Gregory G. Howes include Isaac Newton Institute & University of California, Los Angeles.
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Journal ArticleDOI
Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades in Magnetized Weakly Collisional Plasmas
Alexander Schekochihin,Alexander Schekochihin,Steven Cowley,Steven Cowley,William Dorland,Gregory W. Hammett,Gregory G. Howes,Eliot Quataert,Tomoya Tatsuno +8 more
TL;DR: In this paper, a theoretical framework for understanding plasma turbulence in astrophysical plasmas is presented, motivated by observations of electromagnetic and density fluctuations in the solar wind, interstellar medium and galaxy clusters, as well as by models of particle heating in accretion disks.
Journal ArticleDOI
Magnetic fluctuation power near proton temperature anisotropy instability thresholds in the solar wind.
TL;DR: Measurements of gyroscale magnetic fluctuations in the solar wind show for the first time that these fluctuations are enhanced along the temperature anisotropy thresholds of the mirror, proton oblique firehose, and ion cyclotron instabilities.
Journal ArticleDOI
Astrophysical Gyrokinetics: Basic Equations and Linear Theory
Gregory G. Howes,Steven Cowley,Steven Cowley,William Dorland,Gregory W. Hammett,Eliot Quataert,Alexander Schekochihin +6 more
TL;DR: In this paper, a low-frequency expansion of the kinetic theory called gyrokinetics is proposed to describe the anisotropic turbulence in a wide variety of astrophysical plasmas including accretion disks, the solar wind, and the interstellar and intracluster medium.
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Highly structured slow solar wind emerging from an equatorial coronal hole
Stuart D. Bale,Samuel T. Badman,John W. Bonnell,Trevor A. Bowen,David Burgess,Anthony W. Case,Cynthia A Cattell,Benjamin D. G. Chandran,C. C. Chaston,Christopher H. K. Chen,James Drake,T. Dudok de Wit,Jonathan Eastwood,Robert E. Ergun,William M. Farrell,C. Fong,Keith Goetz,Melvyn L. Goldstein,Melvyn L. Goldstein,Katherine Goodrich,Peter Harvey,Timothy S. Horbury,Gregory G. Howes,Justin C. Kasper,Justin C. Kasper,Paul J. Kellogg,James A. Klimchuk,Kelly E. Korreck,Vladimir Krasnoselskikh,Säm Krucker,Säm Krucker,R. Laker,Davin Larson,Robert J. MacDowall,Milan Maksimovic,David M. Malaspina,J. C. Martínez-Oliveros,D. J. McComas,Nicole Meyer-Vernet,Michel Moncuquet,F. S. Mozer,Tai Phan,Marc Pulupa,N.-E. Raouafi,Chadi Salem,David Stansby,Michael L. Stevens,Adam Szabo,Marco Velli,T. Woolley,John R. Wygant +50 more
TL;DR: Measurements from the Parker Solar Probe show that slow solar wind near the Sun’s equator originates in coronal holes, and plasma-wave measurements suggest the existence of electron and ion velocity-space micro-instabilities that are associated with plasma heating and thermalization processes.
Journal ArticleDOI
A Model of Turbulence in Magnetized Plasmas: Implications for the Dissipation Range in the Solar Wind
Gregory G. Howes,Steven Cowley,Steven Cowley,William Dorland,Gregory W. Hammett,Eliot Quataert,Alexander Schekochihin +6 more
TL;DR: In this paper, a cascade model is presented, based on the assumptions of local nonlinear energy transfer in Wavenumber space, critical balance between linear propagation and nonlinear interaction times, and the applicability of linear dissipation rates for the nonlinearly turbulent plasma.