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A model for lower hybrid wave excitation compared with observations by Viking

The mechanism of lower hybrid wave (LHW) excitation due to the O+ relative drift in a plasma subjected to low‐frequency waves (LFWs) is used for analysis of Viking satellite data for events in the cusp/cleft region. In some cases, such a mechanism leads to LHW energy densities and ion distribution functions close to those observed, suggesting the proposed mechanism is a plausible candidate to explain certain classes of LHW generation events in space plasmas.