Abstract
The HIgh Bandwidth Auroral Rocket (HIBAR), launched into active pre‐midnight aurora, encountered two bursts of 2–10 mV/m upper hybrid waves just below fuh = 2fce at approximately 377 and 390 km altitude. These waves occur in association with a density “shoulder” and enhancement, respectively. The waves show several bands of frequency structure with 4–8 kHz spacings and, within these, bands of frequency sub structure with 1–2 kHz spacings. At the time of the waves, the measured electron distribution indicates wave instability for frequencies 1–1.2% percent below the electron cyclotron harmonic. These results agree qualitatively with theoretical work predicting banded structure associated with upper hybrid waves trapped in density enhancements.
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