A viable source of low-latitude Pc3's in the magnetosphere
Daytime magnetic pulsations observed at synchronous orbit by GOES 2 are analyzed to determine whether there is a candidate for the source of low-latitude Pc 3's in the outer magnetosphere. Compressional, radially transverse, and azimuthally transverse modes of magnetic pulsations in a wide freq...
Main Author: | |
---|---|
Format: | Report |
Language: | English |
Published: |
Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University
1984
|
Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1593 http://id.nii.ac.jp/1291/00001593/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1593&item_no=1&attribute_id=18&file_no=1 |
id |
ftnipr:oai:nipr.repo.nii.ac.jp:00001593 |
---|---|
record_format |
openpolar |
spelling |
ftnipr:oai:nipr.repo.nii.ac.jp:00001593 2023-05-15T17:10:59+02:00 A viable source of low-latitude Pc3's in the magnetosphere Kiyohumi Yumoto 1984-07 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1593 http://id.nii.ac.jp/1291/00001593/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1593&item_no=1&attribute_id=18&file_no=1 en eng Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1593 http://id.nii.ac.jp/1291/00001593/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 31, 63-81(1984-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1593&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1984 ftnipr 2022-11-12T19:42:23Z Daytime magnetic pulsations observed at synchronous orbit by GOES 2 are analyzed to determine whether there is a candidate for the source of low-latitude Pc 3's in the outer magnetosphere. Compressional, radially transverse, and azimuthally transverse modes of magnetic pulsations in a wide frequency range exist simultaneously in the outer daytime magnetosphere. The compressional and the transverse modes of the daytime magnetic pulsations observed at GOES 2 are statistically dominant in the Pc 3 and in the Pc 4 frequency ranges, respectively. Some 70 percent of the compressional Pc 3 pulsations at GOES 2 have periods similar to the low-latitude Pc 3's observed at San Gabriel Canyon, which is located ∿ 11°west of GOES 2's longitude at L=1.8. The transverse Pc pulsations at GOES 2 can propagate only into the high-latitude ionosphere. The compressional Pc 3 pulsations at GOES 2 are theoretically expected to propagate across the ambient magnetic field to very low latitudes and to couple with one or more of the followings; (i) a surface wave at the plasmapause (Lpp), (ii) a trapped oscillation of the fast magnetosonic wave in the plasmasphere (L=1.7∿Lpp), (iii) a higher-harmonic standing oscillation of a local field line at mid-latitudes (L=2.0∿Lpp), and (iv) a fundamental standing oscillation at very low latitudes (L=1.1 and 1.7-2.6). Although further research is needed to clarify the wave and propagation characteristics of the low-latitude Pc 3 pulsations, we believe that the compressional Pc 3 magnetic pulsations in the outer magnetosphere are a source of the low-latitude Pc 3 magnetic pulsations. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
Daytime magnetic pulsations observed at synchronous orbit by GOES 2 are analyzed to determine whether there is a candidate for the source of low-latitude Pc 3's in the outer magnetosphere. Compressional, radially transverse, and azimuthally transverse modes of magnetic pulsations in a wide frequency range exist simultaneously in the outer daytime magnetosphere. The compressional and the transverse modes of the daytime magnetic pulsations observed at GOES 2 are statistically dominant in the Pc 3 and in the Pc 4 frequency ranges, respectively. Some 70 percent of the compressional Pc 3 pulsations at GOES 2 have periods similar to the low-latitude Pc 3's observed at San Gabriel Canyon, which is located ∿ 11°west of GOES 2's longitude at L=1.8. The transverse Pc pulsations at GOES 2 can propagate only into the high-latitude ionosphere. The compressional Pc 3 pulsations at GOES 2 are theoretically expected to propagate across the ambient magnetic field to very low latitudes and to couple with one or more of the followings; (i) a surface wave at the plasmapause (Lpp), (ii) a trapped oscillation of the fast magnetosonic wave in the plasmasphere (L=1.7∿Lpp), (iii) a higher-harmonic standing oscillation of a local field line at mid-latitudes (L=2.0∿Lpp), and (iv) a fundamental standing oscillation at very low latitudes (L=1.1 and 1.7-2.6). Although further research is needed to clarify the wave and propagation characteristics of the low-latitude Pc 3 pulsations, we believe that the compressional Pc 3 magnetic pulsations in the outer magnetosphere are a source of the low-latitude Pc 3 magnetic pulsations. |
format |
Report |
author |
Kiyohumi Yumoto |
spellingShingle |
Kiyohumi Yumoto A viable source of low-latitude Pc3's in the magnetosphere |
author_facet |
Kiyohumi Yumoto |
author_sort |
Kiyohumi Yumoto |
title |
A viable source of low-latitude Pc3's in the magnetosphere |
title_short |
A viable source of low-latitude Pc3's in the magnetosphere |
title_full |
A viable source of low-latitude Pc3's in the magnetosphere |
title_fullStr |
A viable source of low-latitude Pc3's in the magnetosphere |
title_full_unstemmed |
A viable source of low-latitude Pc3's in the magnetosphere |
title_sort |
viable source of low-latitude pc3's in the magnetosphere |
publisher |
Onagawa Magnetic Observatory and Geophysical Institute, Tohoku University |
publishDate |
1984 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1593 http://id.nii.ac.jp/1291/00001593/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1593&item_no=1&attribute_id=18&file_no=1 |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1593 http://id.nii.ac.jp/1291/00001593/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 31, 63-81(1984-07) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1593&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067763840811008 |