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The propagation of traveling atmospheric disturbances observed during the April 6–7, 2000 ionospheric storm
Author(s) -
Lee ChienChih,
Liu JannYenq,
Reinisch Bodo W.,
Lee YungPo,
Liu Libo
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013516
Subject(s) - ionosphere , depth sounding , zonal and meridional , atmospheric sciences , storm , geology , daytime , f region , geomagnetic storm , ionospheric sounding , middle latitudes , critical frequency , latitude , ionogram , geodesy , geophysics , meteorology , physics , electron density , plasma , solar wind , oceanography , quantum mechanics
The great magnetic storm of April 6–7, 2000 generated ionospheric disturbances in the west Pacific region. Two ionosondes at Wuhan (30.6°N, 114.4°E) and Chung‐Li (24.9°N, 121°E) observed the ionosphere during this period. The variations of the ionospheric parameters, NmF 2 (plasma density of the F‐peak), hmF 2 (height of the F‐peak) and h′F (minimum virtual height of the F‐layer), show that a traveling atmospheric disturbance (TAD) affects the ionosphere at middle and low latitudes in this region. The propagation velocities deduced from the time delay of hmF 2 and h′F recorded at the two stations are about 655 and 164 m/s, respectively. Furthermore, a method of deriving the vertical phase and group velocities is applied to the sequences of virtual heights at fixed sounding frequencies. The vertical and associated meridional velocities demonstrate that the upward motions of the ionospheric plasma are caused by a TAD.