North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations
The north-south asymmetry of the amplitude of ULF pulsations in the Pc 3-5 band is studied using magnetic field data from the magnetically conjugate stations at L similar to 5.4: Kotzebue (KOT) in the northern hemisphere and Macquarie Island (MCQ) in the southern hemisphere. We obtained the followin...
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ftunivnewcastnsw:uon:480 2023-05-15T17:09:58+02:00 North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations Obana, Y. Yoshikawa, A. Olson, J. V. Morris, R. J. Fraser, Brian J. Yumoto, K. 2005 http://hdl.handle.net/1959.13/25237 eng eng American Geophysical Union Journal of Geophysical Research-Space Physics Vol. 110, no. A10, p. A10214 finite ionosphere conductivities period magnetic pulsations field line oscillations divergent hall-current standing alfven waves pc 3,4 pulsations geomagnetic-pulsations ulf waves hydromagnetic-waves magnetometer-array journal article 2005 ftunivnewcastnsw 2018-07-27T01:11:14Z The north-south asymmetry of the amplitude of ULF pulsations in the Pc 3-5 band is studied using magnetic field data from the magnetically conjugate stations at L similar to 5.4: Kotzebue (KOT) in the northern hemisphere and Macquarie Island (MCQ) in the southern hemisphere. We obtained the following results for the northward (H) component of magnetic pulsations: (1) The north to south power ratio shows a maximum in the northern winter and a minimum in the northern summer. This "seasonal variation'' is stronger at higher frequencies (Pc 3 and Pc 4 frequencies). (2) The north to south power ratio for the Pc 4 and Pc 5 frequency band is basically greater than 1.0 for all seasons. This "positive offset'' is stronger at lower frequencies. The "seasonal variation'' implies that the magnetohydrodynamic (MHD) waves incident from the magnetosphere are more strongly shielded when the ionospheric conductivity is higher. The "positive offset'' may result from the difference of the background magnetic field intensity between KOT and MCQ. 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 |
finite ionosphere conductivities period magnetic pulsations field line oscillations divergent hall-current standing alfven waves pc 3,4 pulsations geomagnetic-pulsations ulf waves hydromagnetic-waves magnetometer-array |
spellingShingle |
finite ionosphere conductivities period magnetic pulsations field line oscillations divergent hall-current standing alfven waves pc 3,4 pulsations geomagnetic-pulsations ulf waves hydromagnetic-waves magnetometer-array Obana, Y. Yoshikawa, A. Olson, J. V. Morris, R. J. Fraser, Brian J. Yumoto, K. North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations |
topic_facet |
finite ionosphere conductivities period magnetic pulsations field line oscillations divergent hall-current standing alfven waves pc 3,4 pulsations geomagnetic-pulsations ulf waves hydromagnetic-waves magnetometer-array |
description |
The north-south asymmetry of the amplitude of ULF pulsations in the Pc 3-5 band is studied using magnetic field data from the magnetically conjugate stations at L similar to 5.4: Kotzebue (KOT) in the northern hemisphere and Macquarie Island (MCQ) in the southern hemisphere. We obtained the following results for the northward (H) component of magnetic pulsations: (1) The north to south power ratio shows a maximum in the northern winter and a minimum in the northern summer. This "seasonal variation'' is stronger at higher frequencies (Pc 3 and Pc 4 frequencies). (2) The north to south power ratio for the Pc 4 and Pc 5 frequency band is basically greater than 1.0 for all seasons. This "positive offset'' is stronger at lower frequencies. The "seasonal variation'' implies that the magnetohydrodynamic (MHD) waves incident from the magnetosphere are more strongly shielded when the ionospheric conductivity is higher. The "positive offset'' may result from the difference of the background magnetic field intensity between KOT and MCQ. |
format |
Article in Journal/Newspaper |
author |
Obana, Y. Yoshikawa, A. Olson, J. V. Morris, R. J. Fraser, Brian J. Yumoto, K. |
author_facet |
Obana, Y. Yoshikawa, A. Olson, J. V. Morris, R. J. Fraser, Brian J. Yumoto, K. |
author_sort |
Obana, Y. |
title |
North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations |
title_short |
North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations |
title_full |
North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations |
title_fullStr |
North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations |
title_full_unstemmed |
North-south asymmetry of the amplitude of high-latitude Pc 3-5 pulsations: Observations at conjugate stations |
title_sort |
north-south asymmetry of the amplitude of high-latitude pc 3-5 pulsations: observations at conjugate stations |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
http://hdl.handle.net/1959.13/25237 |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
Journal of Geophysical Research-Space Physics Vol. 110, no. A10, p. A10214 |
_version_ |
1766066341118214144 |