11:45 AM - 12:00 PM
[PCG23-05] Frequency dependence on the beaming angle of Jupiter's decametric radio emissions based on LWA1 data analysis
Keywords:Jupiter radio, decametric emissions, modulation lanes, beaming angle
The Long Wavelength Array station 1 (LWA1) is a low-frequency radio telescope designed to produce high-sensitivity, high-resolution spectra in the frequency range of 10-88 MHz. The sensitivity of the LWA1, combined with the low radio frequency interference environment, allows us to observe the wide band modulation lanes of Jupiter's decametric radio emissions [Clarke et al., 2014]. We have analyzed the data including the wide band Io-B modulation lanes observed by LWA1. We found a unique event showing curved modulation lanes over a 22 MHz frequency bandwidth from 12 MHz to 34 MHz. By using our modulation lane method we calculated beaming angles of 57 degrees for 12 MHz and 63 degrees for 34 MHz. The difference of the beaming angles is 6 degrees over a 22 MHz frequency range. This means the value of beaming angle is gradually increasing toward the higher emitting frequency. We will discuss this frequency dependence on the beaming angle of Jupiter's decametric radio emissions based on the archived LWA1 data.
Imai, K., C.A. Higgins, M. Imai, and T.E. Clarke, Jupiter's Io-C and Io-B decametric emission source morphology from LWA1 data analysis, in Planetary Radio Emissions VIII, edited by G. Fischer, G. Mann, M. Panchenko, and P. Zarka, Austrian Academy of Sciences Press, Vienna, pp.89-101, 2017.
Clarke, T.E., C.A. Higgins, Jinhie Skarda, Kazumasa Imai, Masafumi Imai, Francisco Reyes, Jim Thieman, Ted Jaeger, Henrique Schmitt, Nagini Paravastu Dalal, Jayce Dowell, S.W. Ellingson, Brian Hicks, Frank Schinzel, and G.B. Taylor, Probing Jovian decametric emission with the long wavelength array station 1, Journal of Geophysical Research, Space Physics, Vol.119, pp.9508–9526, doi:10.1002/2014JA020289, 2014.