First Observations of the Disruption of the Earth's Foreshock Wave Field During Magnetic Clouds

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Turc , L , Roberts , O W , Archer , M O , Palmroth , M , Battarbee , M , Brito , T , Ganse , U , Grandin , M , Pfau-Kempf , Y , Escoubet , C P & Dandouras , I 2019 , ' First Observations of the Disruption of the Earth's Foreshock Wave Field During Magnetic Clouds ' , Geophysical Research Letters , vol. 46 , no. 22 , pp. 12644-12653 . https://doi.org/10.1029/2019GL084437

Title: First Observations of the Disruption of the Earth's Foreshock Wave Field During Magnetic Clouds
Author: Turc, L.; Roberts, O. W.; Archer, M. O.; Palmroth, M.; Battarbee, M.; Brito, T.; Ganse, U.; Grandin, M.; Pfau-Kempf, Y.; Escoubet, C. P.; Dandouras, I.
Contributor organization: Space Physics Research Group
Particle Physics and Astrophysics
Department of Physics
Date: 2019-11-19
Language: eng
Number of pages: 10
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
DOI: https://doi.org/10.1029/2019GL084437
URI: http://hdl.handle.net/10138/315030
Abstract: The foreshock, extending upstream of Earth's bow shock, is a region of intense electromagnetic wave activity and nonlinear phenomena, which can have global effects on geospace. It is also the first geophysical region encountered by solar wind disturbances journeying toward Earth. Here, we present the first observations of considerable modifications of the foreshock wave field during extreme events of solar origin called magnetic clouds. Cluster's multispacecraft data reveal that the typical quasi-monochromatic foreshock waves can be completely replaced by a superposition of waves each with shorter correlation lengths. Global numerical simulations further confirm that the foreshock wave field is more intricate and organized at smaller scales. Ion measurements suggest that changes in shock-reflected particle properties may cause these modifications of the wave field. This state of the foreshock is encountered only during extreme events at Earth, but intense magnetic fields are typical close to the Sun or other stars.
Subject: foreshock
magnetic clouds
ULF waves
plasma waves
solar wind-magnetosphere interaction
4-SPACECRAFT CLUSTER MISSION
LOW-FREQUENCY WAVES
CONE ANGLE CONTROL
ULF FORESHOCK
TERRESTRIAL FORESHOCK
IONS UPSTREAM
BOW SHOCK
SPECTRUM
PULSATIONS
SIMULATION
115 Astronomy, Space science
114 Physical sciences
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: publishedVersion


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