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Browsing College of Sciences and Mathematics by Author "Takahashi, Kazue"

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Field line distribution of mass density at geostationary orbit 

Denton, R. E.; Takahashi, Kazue; Lee, Jimyoung; Zeitler, C. K.; Wimer, N. T.; Litscher, L. E.; Singer, H. J.; Min, Kyungguk; 0000-0002-2095-8529 (2020-06-05)
The distribution of mass density along the field lines affects the ratios of toroidal (azimuthally oscillating) Alfven frequencies, and given the ratios of these frequencies, we can get information about that distribution. ...

Quiet time equatorial mass density distribution derived from AMPTE/CCE and GOES using the magnetoseismology technique 

Min, Kyungguk; Bortnik, Jacob; Denton, Richard E.; Takahashi, Kazue; Lee, Jeongwoo; Singer, Howard J.; 0000-0002-2095-8529 (2020-06-05)
An inversion technique for estimating the properties of the magnetospheric plasma from the harmonic frequencies of the toroidal standing Alfven waves has been used to derive the global equatorial mass density covering ...

Solar cycle variation of plasma mass density in the outer magnetosphere: Magnetoseismic analysis of toroidal standing Alfven waves detected by Geotail 

Takahashi, Kazue; Denton, Richard E.; Hirahara, Masafumi; Min, Kyungguk; Ohtani, Shin-ichi; Sanchez, Ennio; 0000-0002-2095-8529 (2020-06-05)
We study the variation of plasma mass density in the outer magnetosphere over a solar cycle using mass density estimated from the frequency of fundamental toroidal standing Alfven waves observed by the Geotail spacecraft. ...

Solar cycle variation of plasma mass density in the outer magnetosphere: Magnetoseismic analysis of toroidal standing Alfven waves detected by Geotail 

Takahashi, Kazue; Denton, Richard; Hirahara, Masafumi; Min, Kyungguk; Ohtani, Shin-ichi; Sanchez, Ennio; 0000-0002-9565-6840; 0000-0003-1434-4456 (2023-01-25)
We study the variation of plasma mass density in the outer magnetosphere over a solar cycle using mass density estimated from the frequency of fundamental toroidal standing Alfven waves observed by the Geotail spacecraft. ...