Pc3-4 ULF waves observed by the SuperDARN TIGER radar
Despite extensive research, the mechanisms for propagation of Pc3-4 energy from the generation region at the bow shock to the high-latitude ionosphere remain unresolved. We used high temporal (6-12 s) and spatial (45 km) resolution data from the SuperDARN TIGER radar (Tasmania) to examine Pc3-4 wave...
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ftunivnewcastnsw:uon:418 2023-05-15T17:09:58+02:00 Pc3-4 ULF waves observed by the SuperDARN TIGER radar Ponomarenko, P. V. Menk, F. W. Waters, Colin L. Sciffer, Murray D. 2005 http://hdl.handle.net/1959.13/25312 eng eng Copernicus GmbH Annales Geophysicae Vol. 23, no. 4, p. 1271-1280 magnetospheric physics magnetosphere-ionosphere interactions MHD waves and instabilities solar wind-magnetosphere interactions geomagnetic-pulsations dayside magnetosphere synchronous orbit magnetic-field solar-wind ionosphere cusp propagation signals model journal article 2005 ftunivnewcastnsw 2018-07-27T00:21:13Z Despite extensive research, the mechanisms for propagation of Pc3-4 energy from the generation region at the bow shock to the high-latitude ionosphere remain unresolved. We used high temporal (6-12 s) and spatial (45 km) resolution data from the SuperDARN TIGER radar (Tasmania) to examine Pc3-4 wave signatures at the F-region heights. We focus on a case study on 28 September 2000, when large-amplitude band-limited Pc3-4 oscillations were observed across 10-20 range gates in beam #4 (which points towards the CGM pole) for about four hours preceding MLT noon. These waves were detected in sea-scatter echoes reflected from the ionospheric footprint of the plasmatrough. Nearby ground magnetometer data from Macquarie Island showed very similar variations in both the north-south and east-west components. The radar data revealed the occasional presence of quasi-FLR (field-line resonance) spatial structures with frequencies much higher than those of the local fundamental FLR modes. Detailed spectral analysis of the ionospheric and ground data shows that these structures most probably correspond to a 3rd-harmonic, poloidal-mode FLR. Such observations suggest that compressional Pc3-4 waves produced in the upstream solar wind travel earthward from the magnetopause in the magnetic equatorial plane depositing energy into the Alfvenic modes, as either forced or 3rd-harmonic FLR that reach ionospheric heights along magnetic field lines. Article in Journal/Newspaper Macquarie Island NOVA: The University of Newcastle Research Online (Australia) |
institution |
Open Polar |
collection |
NOVA: The University of Newcastle Research Online (Australia) |
op_collection_id |
ftunivnewcastnsw |
language |
English |
topic |
magnetospheric physics magnetosphere-ionosphere interactions MHD waves and instabilities solar wind-magnetosphere interactions geomagnetic-pulsations dayside magnetosphere synchronous orbit magnetic-field solar-wind ionosphere cusp propagation signals model |
spellingShingle |
magnetospheric physics magnetosphere-ionosphere interactions MHD waves and instabilities solar wind-magnetosphere interactions geomagnetic-pulsations dayside magnetosphere synchronous orbit magnetic-field solar-wind ionosphere cusp propagation signals model Ponomarenko, P. V. Menk, F. W. Waters, Colin L. Sciffer, Murray D. Pc3-4 ULF waves observed by the SuperDARN TIGER radar |
topic_facet |
magnetospheric physics magnetosphere-ionosphere interactions MHD waves and instabilities solar wind-magnetosphere interactions geomagnetic-pulsations dayside magnetosphere synchronous orbit magnetic-field solar-wind ionosphere cusp propagation signals model |
description |
Despite extensive research, the mechanisms for propagation of Pc3-4 energy from the generation region at the bow shock to the high-latitude ionosphere remain unresolved. We used high temporal (6-12 s) and spatial (45 km) resolution data from the SuperDARN TIGER radar (Tasmania) to examine Pc3-4 wave signatures at the F-region heights. We focus on a case study on 28 September 2000, when large-amplitude band-limited Pc3-4 oscillations were observed across 10-20 range gates in beam #4 (which points towards the CGM pole) for about four hours preceding MLT noon. These waves were detected in sea-scatter echoes reflected from the ionospheric footprint of the plasmatrough. Nearby ground magnetometer data from Macquarie Island showed very similar variations in both the north-south and east-west components. The radar data revealed the occasional presence of quasi-FLR (field-line resonance) spatial structures with frequencies much higher than those of the local fundamental FLR modes. Detailed spectral analysis of the ionospheric and ground data shows that these structures most probably correspond to a 3rd-harmonic, poloidal-mode FLR. Such observations suggest that compressional Pc3-4 waves produced in the upstream solar wind travel earthward from the magnetopause in the magnetic equatorial plane depositing energy into the Alfvenic modes, as either forced or 3rd-harmonic FLR that reach ionospheric heights along magnetic field lines. |
format |
Article in Journal/Newspaper |
author |
Ponomarenko, P. V. Menk, F. W. Waters, Colin L. Sciffer, Murray D. |
author_facet |
Ponomarenko, P. V. Menk, F. W. Waters, Colin L. Sciffer, Murray D. |
author_sort |
Ponomarenko, P. V. |
title |
Pc3-4 ULF waves observed by the SuperDARN TIGER radar |
title_short |
Pc3-4 ULF waves observed by the SuperDARN TIGER radar |
title_full |
Pc3-4 ULF waves observed by the SuperDARN TIGER radar |
title_fullStr |
Pc3-4 ULF waves observed by the SuperDARN TIGER radar |
title_full_unstemmed |
Pc3-4 ULF waves observed by the SuperDARN TIGER radar |
title_sort |
pc3-4 ulf waves observed by the superdarn tiger radar |
publisher |
Copernicus GmbH |
publishDate |
2005 |
url |
http://hdl.handle.net/1959.13/25312 |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
Annales Geophysicae Vol. 23, no. 4, p. 1271-1280 |
_version_ |
1766066354558861312 |