In situ evidence of the modification of the parallel propagation of EMIC waves by heated He <sup>+</sup> ions
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Abstract |
With observations of the Van Allen Probe B, we report in situ evidence of the modification of the parallel propagating electromagnetic ion cyclotron (EMIC) waves by heated He+ ions. In the outer boundary of the plasmasphere, accompanied with the He+ ion heating, the frequency bands of H+ and He+ for EMIC waves merged into each other, leading to the disappearance of a usual stop band between the gyrofrequency of He+ ions (ΩHe+) and the H+ cutoff frequency (ωH+co) in the cold plasma. Moreover, the dispersion relation for EMIC waves theoretically calculated with the observed plasma parameters also demonstrates that EMIC waves can indeed parallel propagate across ΩHe+. Therefore, the paper provides an in situ evidence of the modification of the parallel propagation of EMIC waves by heated He+ ions
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Year of Publication |
2016
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Journal |
Journal of Geophysical Research: Space Physics
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Date Published |
07/2016
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URL |
http://doi.wiley.com/10.1002/2016JA022573
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DOI |
10.1002/2016JA022573
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