A
Alexa Halford
Researcher at Goddard Space Flight Center
Publications - 74
Citations - 1701
Alexa Halford is an academic researcher from Goddard Space Flight Center. The author has contributed to research in topics: Van Allen radiation belt & Electron precipitation. The author has an hindex of 17, co-authored 44 publications receiving 1102 citations. Previous affiliations of Alexa Halford include University of Newcastle & University of Colorado Boulder.
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Journal ArticleDOI
The Space Physics Environment Data Analysis System (SPEDAS)
Vassilis Angelopoulos,P. Cruce,Alexander Drozdov,Eric Grimes,N. Hatzigeorgiu,D. A. King,Davin Larson,James W. Lewis,J. M. McTiernan,D. A. Roberts,C. L. Russell,Tomoaki Hori,Yoshiya Kasahara,Atsushi Kumamoto,Ayako Matsuoka,Yukinaga Miyashita,Yoshizumi Miyoshi,I. Shinohara,Mariko Teramoto,Jeremy Faden,Alexa Halford,Matthew D. McCarthy,Robyn Millan,John Sample,David M. Smith,L. A. Woodger,Arnaud Masson,A. A. Narock,Kazushi Asamura,T. F. Chang,C. Y. Chiang,Yoichi Kazama,Kunihiro Keika,S. Matsuda,Tomonori Segawa,Kanako Seki,Masafumi Shoji,Sunny W. Y. Tam,Norio Umemura,B. J. Wang,B. J. Wang,Shiang-Yu Wang,Robert J. Redmon,Juan V. Rodriguez,Juan V. Rodriguez,Howard J. Singer,Jon Vandegriff,S. Abe,Masahito Nose,Masahito Nose,Atsuki Shinbori,Yoshimasa Tanaka,S. UeNo,L. Andersson,P. Dunn,Christopher M. Fowler,Jasper Halekas,Takuya Hara,Yuki Harada,Christina O. Lee,Robert Lillis,David L. Mitchell,Matthew R. Argall,Kenneth R. Bromund,James L. Burch,Ian J. Cohen,Michael Galloy,Barbara L. Giles,Allison Jaynes,O. Le Contel,Mitsuo Oka,T. D. Phan,Brian Walsh,Joseph Westlake,Frederick Wilder,Stuart D. Bale,Roberto Livi,Marc Pulupa,Phyllis Whittlesey,A. DeWolfe,Bryan Harter,E. Lucas,U. Auster,John W. Bonnell,Christopher Cully,Eric Donovan,Robert E. Ergun,Harald U. Frey,Brian Jackel,A. Keiling,Haje Korth,J. P. McFadden,Yukitoshi Nishimura,Ferdinand Plaschke,P. Robert,Drew Turner,James M. Weygand,Robert M. Candey,R. C. Johnson,T. Kovalick,M. H. Liu,R. E. McGuire,Aaron Breneman,Kris Kersten,P. Schroeder +104 more
TL;DR: The SPEDAS development history, goals, and current implementation are reviewed, and its “modes of use” are explained with examples geared for users and its technical implementation and requirements with software developers in mind are outlined.
Journal ArticleDOI
EMIC wave activity during geomagnetic storm and nonstorm periods: CRRES results
Journal ArticleDOI
Observations of coincident EMIC wave activity and duskside energetic electron precipitation on 18-19 January 2013
Lauren Blum,Alexa Halford,Robyn Millan,John W. Bonnell,Jerry Goldstein,Maria Usanova,Mark J. Engebretson,M. Ohnsted,Geoffrey D. Reeves,Howard J. Singer,Mark A. Clilverd,Xinlin Li +11 more
TL;DR: In this article, magnetically conjugate measurements are presented of EMIC wave activity, measured at geosynchronous orbit and on the ground, and energetic electron precipitation, seen by the Balloon Array for Radiation belt Relativistic Electron Losses (BARREL) campaign, on two consecutive days in January 2013.
Journal ArticleDOI
Global-scale coherence modulation of radiation-belt electron loss from plasmaspheric hiss
Aaron Breneman,Alexa Halford,Robyn Millan,Matthew D. McCarthy,J. F. Fennell,John Sample,L. A. Woodger,George Hospodarsky,John R. Wygant,Cynthia A Cattell,Jerry Goldstein,David M. Malaspina,Craig Kletzing +12 more
TL;DR: In this paper, the same authors used simultaneous measurements of radiation-belt electron loss and plasmaspheric hiss to show that losses in the form of bremsstrahlung X-rays generated within the Earth's atmosphere arise from hiss-scattered electrons colliding with atmospheric neutrals after removal from the radiation belts.
Journal ArticleDOI
Interplanetary shocks and the resulting geomagnetically induced currents at the equator
Brett Carter,Brett Carter,Endawoke Yizengaw,Rezy Pradipta,Alexa Halford,Robert J. Norman,Kefei Zhang +6 more
TL;DR: In this article, the authors investigate the potential effects of interplanetary shocks on the equatorial region and demonstrate that their magnetic signature is amplified by an equatorial electrojet, which substantially increases the region's susceptibility to GICs.