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September 18, 2025Physica Scripta

The effect of plasma expansion on the dispersion properties of MHD waves

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Analytical model explores plasma expansion’s impact on Alfvén and fast magnetosonic modes, indicating significant influence on solar wind behavior.

Plasma expansion significantly decreases wave frequencies, affecting MHD wave propagation.
Dispersion relations reflect a spatial dependence linked to traditional ideal MHD scenarios.
Different models for the polytropic index show varied impacts on magnetosonic wave characteristics.
Fast magnetosonic mode exhibits acceleration in distant heliosphere, emphasizing expansion effects.

Saldivia et al. (2025) studied this question.

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Analytical model explores plasma expansion’s impact on Alfvén and fast magnetosonic modes, indicating significant influence on solar wind behavior.