@article{c43d16a7debc4ee8a7013f4ead3bd618,
title = "On the Driver of Daytime Pc3 Auroral Pulsations",
abstract = "Pc3 range frequency (22–100 mHz) auroral pulsations often occur at daytime high latitudes, equatorward of the cusp/cleft and typically map to the dayside outer magnetosphere. In this paper we present simultaneous observations of compressional Pc3 magnetic pulsations in the dayside outer magnetosphere that occurred in direct association with daytime Pc3 auroral pulsations at South Pole Station (−74.4° magnetic latitude). The pulsations were almost identical at the two locations, and their correlation was clearest when the magnetospheric pulsations were highly monochromatic. Lower-band chorus waves and keV electron fluxes were also modulated in the Pc3 range, likely by the compressional magnetic pulsations. The common Pc3 frequency in the magnetosphere and aurora matched well with the predicted frequency of upstream ultralow frequency waves. These results provide the first compelling evidence for the direct dayside outer magnetosphere-ionosphere linkage between upstream-generated compressional Pc3 waves, Pc3 range modulations of chorus waves and keV electrons, and Pc3 auroral pulsations.",
keywords = "ULF modulation, compressional Pc3 waves, dayside auroral pulsations, outer magnetosphere",
author = "T. Motoba and Y. Ebihara and Y. Ogawa and A. Kadokura and Engebretson, {M. J.} and V. Angelopoulos and Andrew Gerrard and Weatherwax, {A. T.}",
note = "Funding Information: Work at JHU/APL was supported by an NSF grant OPP‐1744609. Work by M. J. E. was supported by NSF grant AGS‐1651263. Merrimack College gratefully acknowledges support from NSF Awards 1716192 and 1742693. Data from the THEMIS and ARTEMIS Missions supported by NASA contract NAS5‐02099 are publicly available at http://themis.igpp.ucla.edu/. The THEMIS electron flux data were processed with the THEMIS plug‐in of the SPEDAS software. The South Pole all‐sky optical instruments have been supported by NSF grants PLR‐1247975, ANT‐1643700, and ANT‐0638587, and the Japanese Antarctic Research Expedition (JARE) program. The South Pole ~2‐Hz all‐sky image data were provided by NIPR, Japan (http:// polaris.nipr.ac.jp/~asi‐dp/watcam/). The authors are very grateful to Y. Miyashita and T. Nagai for providing the Geotail MGF data. We also acknowledge the CDAWeb for access to the 1‐min OMNI data (https://omni- web.gsfc.nasa.gov). Funding Information: Work at JHU/APL was supported by an NSF grant OPP-1744609. Work by M. J. E. was supported by NSF grant AGS-1651263. Merrimack College gratefully acknowledges support from NSF Awards 1716192 and 1742693. Data from the THEMIS and ARTEMIS Missions supported by NASA contract NAS5-02099 are publicly available at http://themis.igpp.ucla.edu/. The THEMIS electron flux data were processed with the THEMIS plug-in of the SPEDAS software. The South Pole all-sky optical instruments have been supported by NSF grants PLR-1247975, ANT-1643700, and ANT-0638587, and the Japanese Antarctic Research Expedition (JARE) program. The South Pole ~2-Hz all-sky image data were provided by NIPR, Japan (http://polaris.nipr.ac.jp/~asi-dp/watcam/). The authors are very grateful to Y. Miyashita and T. Nagai for providing the Geotail MGF data. We also acknowledge the CDAWeb for access to the 1-min OMNI data (https://omniweb.gsfc.nasa.gov). Publisher Copyright: {\textcopyright} 2018. American Geophysical Union. All Rights Reserved.",
year = "2019",
month = jan,
day = "28",
doi = "10.1029/2018GL080842",
language = "English (US)",
volume = "46",
pages = "553--561",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "2",
}