Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves
Intervals of pulsations of diminishing periods (IPDPs) are a subtype of electromagnetic ion cyclotron (EMIC) waves that can be triggered by substorm onset. Pi1B waves are ultralow frequency (ULF) broadband bursts that are well correlated with substorm onset. IPDPs are associated with increased fluxe...
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ftunivnewcastnsw:uon:53274 2023-12-17T10:22:19+01:00 Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves Salzano, Michelle Lessard, Marc R. Kim, Khan-Hyuk Matzka, Jürgen Fromm, Tanja Goldstein, Jerry Kim, Myeong Joon Noh, Sungjun Kim, Hyomin Waters, Colin Engebretson, Mark J. Horne, Richard Clilverd, Mark Kadokura, Akira Tanaka, Yoshimasa The University of Newcastle. College of Engineering, Science & Environment, School of Information and Physical Sciences 2022 http://hdl.handle.net/1959.13/1492197 eng eng Wiley-Blackwell Journal of Geophysical Research: Space Physics Vol. 127, Issue 10, no. e2022JA030600 10.1029/2022JA030600 http://hdl.handle.net/1959.13/1492197 uon:53274 ISSN:2169-9380 ULF waves EMIC waves IPDPs Pi1B waves drift shell splitting modeling journal article 2022 ftunivnewcastnsw 2023-11-20T23:27:03Z Intervals of pulsations of diminishing periods (IPDPs) are a subtype of electromagnetic ion cyclotron (EMIC) waves that can be triggered by substorm onset. Pi1B waves are ultralow frequency (ULF) broadband bursts that are well correlated with substorm onset. IPDPs are associated with increased fluxes of 40–60 keV substorm-injected protons which undergo gradient-curvature drifting and interact with the cold plasmasphere population. While particle trajectories and the generation of IPDPs have been modeled in the past, those models neglect the role that drift shell splitting plays in the process. This research investigates the different pathways that Pi1B and IPDPs take from their shared origin in substorm onset to their distinct observations on the ground, including the effects of drift shell splitting en route. This paper presents two case studies using data from an array of four ground-based Antarctic magnetometers that cover the evening sector, as well as in situ magnetometer data, proton fluxes, and proton pitch angles from the Van Allen Probes spacecraft. These observations identify a separation in geomagnetic latitude between Pi1Bs and IPDPs, and pinpoint a separation in magnetic local time (MLT). From these observations we model the drift shell splitting which injected particles undergo post-onset. This study shows that simulations that incorporate drift shell splitting across a full injection front are dominated by injection boundary effects, and that the inclusion of drift shell splitting introduces a slight horizontal component to the time axis of the time–frequency dependence of the IPDPs. Article in Journal/Newspaper Antarc* Antarctic NOVA: The University of Newcastle Research Online (Australia) Antarctic |
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Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
ULF waves EMIC waves IPDPs Pi1B waves drift shell splitting modeling |
spellingShingle |
ULF waves EMIC waves IPDPs Pi1B waves drift shell splitting modeling Salzano, Michelle Lessard, Marc R. Kim, Khan-Hyuk Matzka, Jürgen Fromm, Tanja Goldstein, Jerry Kim, Myeong Joon Noh, Sungjun Kim, Hyomin Waters, Colin Engebretson, Mark J. Horne, Richard Clilverd, Mark Kadokura, Akira Tanaka, Yoshimasa Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves |
topic_facet |
ULF waves EMIC waves IPDPs Pi1B waves drift shell splitting modeling |
description |
Intervals of pulsations of diminishing periods (IPDPs) are a subtype of electromagnetic ion cyclotron (EMIC) waves that can be triggered by substorm onset. Pi1B waves are ultralow frequency (ULF) broadband bursts that are well correlated with substorm onset. IPDPs are associated with increased fluxes of 40–60 keV substorm-injected protons which undergo gradient-curvature drifting and interact with the cold plasmasphere population. While particle trajectories and the generation of IPDPs have been modeled in the past, those models neglect the role that drift shell splitting plays in the process. This research investigates the different pathways that Pi1B and IPDPs take from their shared origin in substorm onset to their distinct observations on the ground, including the effects of drift shell splitting en route. This paper presents two case studies using data from an array of four ground-based Antarctic magnetometers that cover the evening sector, as well as in situ magnetometer data, proton fluxes, and proton pitch angles from the Van Allen Probes spacecraft. These observations identify a separation in geomagnetic latitude between Pi1Bs and IPDPs, and pinpoint a separation in magnetic local time (MLT). From these observations we model the drift shell splitting which injected particles undergo post-onset. This study shows that simulations that incorporate drift shell splitting across a full injection front are dominated by injection boundary effects, and that the inclusion of drift shell splitting introduces a slight horizontal component to the time axis of the time–frequency dependence of the IPDPs. |
author2 |
The University of Newcastle. College of Engineering, Science & Environment, School of Information and Physical Sciences |
format |
Article in Journal/Newspaper |
author |
Salzano, Michelle Lessard, Marc R. Kim, Khan-Hyuk Matzka, Jürgen Fromm, Tanja Goldstein, Jerry Kim, Myeong Joon Noh, Sungjun Kim, Hyomin Waters, Colin Engebretson, Mark J. Horne, Richard Clilverd, Mark Kadokura, Akira Tanaka, Yoshimasa |
author_facet |
Salzano, Michelle Lessard, Marc R. Kim, Khan-Hyuk Matzka, Jürgen Fromm, Tanja Goldstein, Jerry Kim, Myeong Joon Noh, Sungjun Kim, Hyomin Waters, Colin Engebretson, Mark J. Horne, Richard Clilverd, Mark Kadokura, Akira Tanaka, Yoshimasa |
author_sort |
Salzano, Michelle |
title |
Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves |
title_short |
Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves |
title_full |
Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves |
title_fullStr |
Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves |
title_full_unstemmed |
Modeling the Effects of Drift Shell Splitting in Two Case Studies of Simultaneous Observations of Substorm-Driven Pi1B and IPDP-Type EMIC Waves |
title_sort |
modeling the effects of drift shell splitting in two case studies of simultaneous observations of substorm-driven pi1b and ipdp-type emic waves |
publisher |
Wiley-Blackwell |
publishDate |
2022 |
url |
http://hdl.handle.net/1959.13/1492197 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Journal of Geophysical Research: Space Physics Vol. 127, Issue 10, no. e2022JA030600 10.1029/2022JA030600 http://hdl.handle.net/1959.13/1492197 uon:53274 ISSN:2169-9380 |
_version_ |
1785546326647242752 |