Hectometric Continuum (IMAGE)
Caption
Example of hectometric continuum (HMC) radiation recorded by the ERG (Arase) satellite on September 26, 2019. The top panel shows how the intensity of the radio signal varied across the 100–2000 kHz range. The horizontal bands between 850 and 1750 kHz correspond to the HMC. Three short bursts at frequencies between 300 and 700 kHz represent auroral kilometric radiation (AKR), which occurs in the polar regions during periods of magnetic disturbance. The lower panel shows variations in a parameter related to the polarisation of the radio signal, calculated from electric field measurements taken by the satellite. The HMC radiation exhibits left-hand polarisation (red–orange areas), while the AKR displays right-hand polarisation (blue areas). The differences in polarisation and frequency make it possible to reliably distinguish between these two types of radio emissions within Earth’s magnetosphere.
Credit
© Dorofeev, D. & Chernyshov, A. & Mogilevsky, M. & Chugunin, Dmitry. (2025). Hectometric Continuum Radiation Observations on Different Temporal Scales in Near‐Earth Space. Journal of Geophysical Research: Space Physics. 130. 10.1029/2025JA033900.
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