Statistical studies of Pc 3-5 pulsations and their relevance for possible source mechanisms of ULF waves

Details Statistical studies of Pc 3-5 pulsations and their relevance for possible source mechanisms of ULF waves Statistical studies of Pc 3-5 pulsations and their relevance for possible source mechanisms of ULF waves

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..128a&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 2-3, p. 128-143.

Physics

19

Extremely Low Radio Frequencies, Geomagnetic Pulsations, Solar Terrestrial Interactions, Statistical Analysis

Scientific paper

A number of statistical studies using spacecraft data have been made of ULF waves in the magnetosphere. These studies provide an overview of ULF pulsation activity for r = 5-15 R(E) and allow an assessment of likely source mechanisms. In this review pulsations are categorized into five general types: compressional Pc 5, poloidal Pc 4, toroidal harmonics, toroidal Pc 5 (fundamental mode), and incoherent noise. The occurrence distributions and/or distributions of wave power of the different types suggest that compressional Pc 5 and poloidal Pc 4 derive their energy locally, most likely from energetic protons. The toroidal pulsations, both harmonic and fundamental mode, appear to be driven by an energy source outside the magnetopause - directly upstream in the sheath and solar wind for harmonics and the flanks for fundamentals. Incoherent pulsations are a prominent pulsation type but from their occurrence distribution alone it is unclear what their dominant energy source may be.

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