Are dayside long-period pulsations related to the cusp?
We compare simultaneous observations of long-period ultra-low-frequency (ULF) wave activity from a Svalbard/IMAGE fluxgate magnetometer latitudinal profile covering the expected cusp geomagnetic latitudes. Irregular Pulsations at Cusp Latitudes (IPCL) and narrowband Pc5 waves are found to be a ubiqu...
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ftdoajarticles:oai:doaj.org/article:c82fd6168162405a850f5a5548a10abb 2023-05-15T18:29:44+02:00 Are dayside long-period pulsations related to the cusp? V. Pilipenko V. Belakhovsky M. J. Engebretson A. Kozlovsky T. Yeoman 2015-03-01T00:00:00Z https://doi.org/10.5194/angeo-33-395-2015 https://doaj.org/article/c82fd6168162405a850f5a5548a10abb EN eng Copernicus Publications https://www.ann-geophys.net/33/395/2015/angeo-33-395-2015.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-33-395-2015 0992-7689 1432-0576 https://doaj.org/article/c82fd6168162405a850f5a5548a10abb Annales Geophysicae, Vol 33, Pp 395-404 (2015) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2015 ftdoajarticles https://doi.org/10.5194/angeo-33-395-2015 2022-12-31T14:10:42Z We compare simultaneous observations of long-period ultra-low-frequency (ULF) wave activity from a Svalbard/IMAGE fluxgate magnetometer latitudinal profile covering the expected cusp geomagnetic latitudes. Irregular Pulsations at Cusp Latitudes (IPCL) and narrowband Pc5 waves are found to be a ubiquitous element of ULF activity in the dayside high-latitude region. To identify the ionospheric projections of the cusp, we use the width of return signal of the Super Dual Auroral Radar Network (SuperDARN) radar covering the Svalbard archipelago, predictions of empirical cusp models, augmented whenever possible by Defense Meteorological Satellite Program (DMSP) identification of magnetospheric boundary domains. The meridional spatial structure of broadband dayside Pc5–6 pulsation spectral power has been found to have a localized latitudinal peak, not under the cusp proper as was previously thought, but several degrees southward from the equatorward cusp boundary. The earlier claims of the dayside monochromatic Pc5 wave association with the open–closed boundary also seems doubtful. Transient currents producing broadband Pc5–6 probably originate at the low-latitude boundary layer/central plasma sheet (LLBL/CPS) interface, though such identification with available DMSP data is not very precise. The occurrence of broadband Pc5–6 pulsations in the dayside boundary layers is a challenge to modelers because so far their mechanism has not been firmly identified. Article in Journal/Newspaper Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Svalbard Archipelago Annales Geophysicae 33 3 395 404 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 V. Pilipenko V. Belakhovsky M. J. Engebretson A. Kozlovsky T. Yeoman Are dayside long-period pulsations related to the cusp? |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
We compare simultaneous observations of long-period ultra-low-frequency (ULF) wave activity from a Svalbard/IMAGE fluxgate magnetometer latitudinal profile covering the expected cusp geomagnetic latitudes. Irregular Pulsations at Cusp Latitudes (IPCL) and narrowband Pc5 waves are found to be a ubiquitous element of ULF activity in the dayside high-latitude region. To identify the ionospheric projections of the cusp, we use the width of return signal of the Super Dual Auroral Radar Network (SuperDARN) radar covering the Svalbard archipelago, predictions of empirical cusp models, augmented whenever possible by Defense Meteorological Satellite Program (DMSP) identification of magnetospheric boundary domains. The meridional spatial structure of broadband dayside Pc5–6 pulsation spectral power has been found to have a localized latitudinal peak, not under the cusp proper as was previously thought, but several degrees southward from the equatorward cusp boundary. The earlier claims of the dayside monochromatic Pc5 wave association with the open–closed boundary also seems doubtful. Transient currents producing broadband Pc5–6 probably originate at the low-latitude boundary layer/central plasma sheet (LLBL/CPS) interface, though such identification with available DMSP data is not very precise. The occurrence of broadband Pc5–6 pulsations in the dayside boundary layers is a challenge to modelers because so far their mechanism has not been firmly identified. |
format |
Article in Journal/Newspaper |
author |
V. Pilipenko V. Belakhovsky M. J. Engebretson A. Kozlovsky T. Yeoman |
author_facet |
V. Pilipenko V. Belakhovsky M. J. Engebretson A. Kozlovsky T. Yeoman |
author_sort |
V. Pilipenko |
title |
Are dayside long-period pulsations related to the cusp? |
title_short |
Are dayside long-period pulsations related to the cusp? |
title_full |
Are dayside long-period pulsations related to the cusp? |
title_fullStr |
Are dayside long-period pulsations related to the cusp? |
title_full_unstemmed |
Are dayside long-period pulsations related to the cusp? |
title_sort |
are dayside long-period pulsations related to the cusp? |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/angeo-33-395-2015 https://doaj.org/article/c82fd6168162405a850f5a5548a10abb |
geographic |
Svalbard Svalbard Archipelago |
geographic_facet |
Svalbard Svalbard Archipelago |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Annales Geophysicae, Vol 33, Pp 395-404 (2015) |
op_relation |
https://www.ann-geophys.net/33/395/2015/angeo-33-395-2015.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-33-395-2015 0992-7689 1432-0576 https://doaj.org/article/c82fd6168162405a850f5a5548a10abb |
op_doi |
https://doi.org/10.5194/angeo-33-395-2015 |
container_title |
Annales Geophysicae |
container_volume |
33 |
container_issue |
3 |
container_start_page |
395 |
op_container_end_page |
404 |
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