Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability
An isolated burst of 0.35 Hz electromagnetic ion cyclotron (EMIC) waves was observed at four sites on Svalbard from 0947 to 0954 UT 2 January 2011, roughly 1 h after local noon. This burst was associated with one of a series of ~50 nT magnetic impulses observed at the northernmost stations of the IM...
Published in: | Journal of Geophysical Research: Space Physics |
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_247505 2023-05-15T17:08:31+02:00 Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability Engbretson, M. Yeoman, T. Oksavik, K. Sraas, F. Sigernes, F. Moen, J. Johnson, M. Philipenko, V. Posch, J. Lessard, M. Lavruad, B. Hartinger, M. Clausen, L. Raita, T. Stolle, C. 0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum 2013 https://gfzpublic.gfz-potsdam.de/pubman/item/item_247505 unknown info:eu-repo/semantics/altIdentifier/doi/10.1002/jgra.50291 https://gfzpublic.gfz-potsdam.de/pubman/item/item_247505 Journal of Geophysical Research 550 - Earth sciences info:eu-repo/semantics/article 2013 ftgfzpotsdam https://doi.org/10.1002/jgra.50291 2022-09-14T05:56:26Z An isolated burst of 0.35 Hz electromagnetic ion cyclotron (EMIC) waves was observed at four sites on Svalbard from 0947 to 0954 UT 2 January 2011, roughly 1 h after local noon. This burst was associated with one of a series of ~50 nT magnetic impulses observed at the northernmost stations of the IMAGE magnetometer array. Hankasalmi SuperDARN radar data showed a west-to-east (antisunward) propagating vortical ionospheric flow in a region of high spectral width ~ 1–2° north of Svalbard, confirming that this magnetic impulse was the signature of a traveling convection vortex. Ground-based observations of the Hα line at Longyearbyen indicated proton precipitation at the same time as the EMIC wave burst, and NOAA-19, which passed over the west coast of Svalbard between 0951 and 0952, observed a clear enhancement of ring current protons at the same latitude. Electron precipitation from this same satellite indicated that the EMIC burst was located on closed field lines, but near to the polar cap boundary. We believe these are the first simultaneous observations of EMIC waves and precipitating energetic protons so near to the boundary of the dayside magnetosphere. Although several spacecraft upstream of Earth observed a steady solar wind and predominantly radial interplanetary magnetic field orientation before and during this event, data from Geotail (near the morning bow shock) showed large reorientations of the interplanetary magnetic field and substantial decreases in ion density several minutes before it, and data from Cluster (near the afternoon bow shock) showed an outward excursion of the bow shock simultaneous with it. These upstream perturbations suggest that a spontaneous hot flow anomaly, a bow shock related instability, may have been responsible for triggering this event, but do not provide enough information to fully characterize that instability. Article in Journal/Newspaper Longyearbyen Svalbard GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Svalbard Longyearbyen Journal of Geophysical Research: Space Physics 118 6 2975 2997 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Engbretson, M. Yeoman, T. Oksavik, K. Sraas, F. Sigernes, F. Moen, J. Johnson, M. Philipenko, V. Posch, J. Lessard, M. Lavruad, B. Hartinger, M. Clausen, L. Raita, T. Stolle, C. Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability |
topic_facet |
550 - Earth sciences |
description |
An isolated burst of 0.35 Hz electromagnetic ion cyclotron (EMIC) waves was observed at four sites on Svalbard from 0947 to 0954 UT 2 January 2011, roughly 1 h after local noon. This burst was associated with one of a series of ~50 nT magnetic impulses observed at the northernmost stations of the IMAGE magnetometer array. Hankasalmi SuperDARN radar data showed a west-to-east (antisunward) propagating vortical ionospheric flow in a region of high spectral width ~ 1–2° north of Svalbard, confirming that this magnetic impulse was the signature of a traveling convection vortex. Ground-based observations of the Hα line at Longyearbyen indicated proton precipitation at the same time as the EMIC wave burst, and NOAA-19, which passed over the west coast of Svalbard between 0951 and 0952, observed a clear enhancement of ring current protons at the same latitude. Electron precipitation from this same satellite indicated that the EMIC burst was located on closed field lines, but near to the polar cap boundary. We believe these are the first simultaneous observations of EMIC waves and precipitating energetic protons so near to the boundary of the dayside magnetosphere. Although several spacecraft upstream of Earth observed a steady solar wind and predominantly radial interplanetary magnetic field orientation before and during this event, data from Geotail (near the morning bow shock) showed large reorientations of the interplanetary magnetic field and substantial decreases in ion density several minutes before it, and data from Cluster (near the afternoon bow shock) showed an outward excursion of the bow shock simultaneous with it. These upstream perturbations suggest that a spontaneous hot flow anomaly, a bow shock related instability, may have been responsible for triggering this event, but do not provide enough information to fully characterize that instability. |
author2 |
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum |
format |
Article in Journal/Newspaper |
author |
Engbretson, M. Yeoman, T. Oksavik, K. Sraas, F. Sigernes, F. Moen, J. Johnson, M. Philipenko, V. Posch, J. Lessard, M. Lavruad, B. Hartinger, M. Clausen, L. Raita, T. Stolle, C. |
author_facet |
Engbretson, M. Yeoman, T. Oksavik, K. Sraas, F. Sigernes, F. Moen, J. Johnson, M. Philipenko, V. Posch, J. Lessard, M. Lavruad, B. Hartinger, M. Clausen, L. Raita, T. Stolle, C. |
author_sort |
Engbretson, M. |
title |
Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability |
title_short |
Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability |
title_full |
Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability |
title_fullStr |
Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability |
title_full_unstemmed |
Multi-instrument Observations from Svalbard of a Traveling Convection Vortex, Electromagnetic Ion Cyclotron Wave Burst, and Proton Precipitation Associated with a Bow Shock Instability |
title_sort |
multi-instrument observations from svalbard of a traveling convection vortex, electromagnetic ion cyclotron wave burst, and proton precipitation associated with a bow shock instability |
publishDate |
2013 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_247505 |
geographic |
Svalbard Longyearbyen |
geographic_facet |
Svalbard Longyearbyen |
genre |
Longyearbyen Svalbard |
genre_facet |
Longyearbyen Svalbard |
op_source |
Journal of Geophysical Research |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/jgra.50291 https://gfzpublic.gfz-potsdam.de/pubman/item/item_247505 |
op_doi |
https://doi.org/10.1002/jgra.50291 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
118 |
container_issue |
6 |
container_start_page |
2975 |
op_container_end_page |
2997 |
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1766064292723949568 |