Relationship Between Saturn Kilometric Radiation Emissions and Kronian Magnetotail Activity, as Compared with the Terrestrial Case

Details Relationship Between Saturn Kilometric Radiation Emissions and Kronian Magnetotail Activity, as Compared with the Terrestrial Case Relationship Between Saturn Kilometric Radiation Emissions and Kronian Magnetotail Activity, as Compared with the Terrestrial Case

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm41b1657j&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM41B-1657

Mathematics

Probability

2756 Planetary Magnetospheres (5443, 5737, 6033), 6275 Saturn, 7526 Magnetic Reconnection (2723, 7835), 7534 Radio Emissions

Scientific paper

Several examples of plasmoid passage associated with substorm-like reconnection in the magnetotail of Saturn have been discovered using data from the Cassini magnetometer [Jackman et al., 2008]. Some of these events (along with several others) have subsequently been found to be roughly associated with bursts of Saturn Kilometric Radiation (SKR) emission. We explore this link in detail, with particular emphasis on expansions of the radio emission to lower frequencies, signifying motion of the source along the field lines. We compare with observations of Auroral Kilometric Radiation (AKR) at Earth, which has been shown in some cases to have a separate low-frequency component associated with substorm onset [Morioka et al., 2007] We also wish to estimate the recurrence rate of kronian substorms. Previously for the case of the terrestrial magnetosphere, it has been found that the substorm phenomenon is identified with a component of the probability distribution of durations for which the AU or AL indices are above or below a fixed threshold, respectively [Freeman, Watkins and Riley, 2000]. After exploring the correlation between terrestrial substorms and AKR (which can be a reasonable proxy for the AE indices), we then apply the threshold crossing technique to Saturn by using data from the Cassini Radio and Plasma Wave Science (RPWS) instrument. We look at the probability distributions of Saturn's radio emissions in different frequency bands above and below fixed thresholds, with a view to revealing kronian substorms as a distinct separate population with a characteristic scale. References: Freeman, M.P., N.W. Watkins and D.J. Riley, (2000), Evidence for a solar wind origin of the power law burst lifetime distribution of the AE indices, Geophys. Res. Lett., 27, 8, 1087-1090. Jackman, C. M., C. S. Arridge, N. Krupp, E. J. Bunce, D. G. Mitchell, W. S. Kurth, H. J. McAndrews, M. K. Dougherty, C. T. Russell, N. Achilleos, A. J. Coates, and G. H. Jones (2008), A multi-instrument view of tail reconnection at Saturn, J. Geophys. Res., doi:10.1029/2008JA013592, in press. Morioka, A., Y. Miyoshi, F. Tsuchiya, H. Misawa, T. Sakanoi, K. Yumoto, R.R. Anderson, J.D. Menietti, and E.F. Donovan, (2007), Dual structure of auroral acceleration regions at substorm onsets as derived from auroral kilometric radiation spectra, J. Geophys. Res., 112, doi:10.1029/2006JA012186.

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