MHD-Wave Exposure on the Ionosphere - Hydromagnetic Waves in the Magnetosphere and the Ionosphere - page 358

b ≈ 1nT . Thus, the reflected non-propagating FMS-mode resulting due

to the incident Alfven wave, causes quasi-periodic modulation of electron con-
centration. Theoretical estimates and numerical calculations have shown that
pulsations in the Pc 3 , 4 range can result in a modulation of the relative TEC
of up to 0 . 01%.

0 . 1 −

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