Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

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Compressional mode Alfvén waves excited in the nightside inner magnetosphere travel rapidly to the dayside, exhibiting a small phase difference that is consistent with ground observations of Pi2 pulsations. Novelty: ClaimNovelty.CONFIRMATORY. Consensus alignment: ConsensusAlignment.SUPPORTS_CONSENSUS.

K. Majmudar; R. L. Lysak; K. Takahashi; Khilav Majmudar

doi:10.1029/2025ja034346

September 1, 2026Journal of Geophysical Research Space PhysicsOpen Access

Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

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Key Points

To investigate the excitation, harmonic structure, and global propagation of cavity mode oscillations reaching low-latitude ground magnetic fields.
Simulated equatorial wave dynamics using a global linear magnetohydrodynamic (MHD) wave model formulated in spherical coordinates.
Modeled standing cavity waves within a dense plasmasphere driven by interplanetary shocks and nightside perturbations.
Compared simulated magnetic signatures with empirical ground magnetometer measurements from the mid-latitude EMMA array.
Successfully reproduced the principal standing cavity mode harmonics sustained by the dense plasmasphere.
Found minimal phase differences between compressional Alfvén waves at midnight low altitudes and noon ground equatorial locations.
Demonstrated that cavity mode oscillations excited on the nightside inner magnetosphere rapidly propagate azimuthally to the dayside.

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Implication

Computational MHD modeling demonstrates rapid day-to-night propagation of cavity mode oscillations in Earth's inner magnetosphere, indicating fast global coupling during geomagnetic events.

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Majmudar et al. (2026) studied this question.

synapsesocial.com/papers/6a993487636c6408cfa7c448 https://doi.org/10.1029/2025ja034346

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Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

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Numerical Investigations of Low‐Latitude Ground Magnetic Fields Due To Cavity Mode Oscillations

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