Auroral zone plasma waves detected at polar: PCBL waves

Polar Cap Boundary Layer waves are ELF/VLF electric and magnetic waves detected on field lines adjacent to the polar cap, thus their name. Waves are present at this location 96% of the time. The wave latitude-local time distribution is shown to be the same as that of the auroral oval. The most inten...

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Bibliographic Details
Published in:Advances in space research 2001, Vol.28 (11), p.1655-1659
Main Authors: Tsurutani, B.T., Arballo, J.K., Galvan, C., Zhang, L.D., Lakhina, G.S., Hada, T., Pickett, J.S., Gurnett, D.A.
Format: Article
Language:English
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Summary:Polar Cap Boundary Layer waves are ELF/VLF electric and magnetic waves detected on field lines adjacent to the polar cap, thus their name. Waves are present at this location 96% of the time. The wave latitude-local time distribution is shown to be the same as that of the auroral oval. The most intense waves are detected coincident with the strongest magnetic field gradients (field-aligned currents). Specific frequency bands of whistler mode-waves are identified: ∼200 Hz, 1–2 kHz and ∼5 kHz. Two types of intense electric waves are present: solitary bipolar pulses (electron holes) and ∼kHz electric turbulence. The PCBL waves are most likely a consequence of auroral zone field-aligned current instabilities. The currents have in turn been ascribed to be due to magnetospheric convection driven by the solar wind.
ISSN:0273-1177
1879-1948
DOI:10.1016/S0273-1177(01)00483-5