SM31C-2506
Beaming Structures of Jupiter's Decametric Radiation from LWA1, NDA, and URAN2 Simultaneous Observations
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Masafumi Imai1, Alain Lecacheux2, Charles A Higgins3, Tracy Clarke4, Mykhaylo Panchenko5, Anatolii I Brazhenko6, Anatolii V Frantsuzenko6, Alexander A Konovalenko7 and Kazumasa Imai8, (1)Kyoto University, Kyoto, Japan, (2)Paris Observatory Meudon, Meudon, France, (3)Middle Tennessee State University, Physics and Astronomy, Murfreesboro, TN, United States, (4)Naval Research Lab DC, 7200, Washington, DC, United States, (5)Space Research Institute, Graz, Austria, (6)Poltava Gravimetric Observatory, Poltava, Ukraine, (7)Institute of Radio Astronomy, Kharkov, Ukraine, (8)Kochi Natl College Tech, Nankoku City Kochi, Japan
Abstract:
From December 2014 to March 2015, Jupiter's decametric (DAM) radio observations were carried out by using simultaneously three powerful low-frequency radio telescopes: Long Wavelength Array One (LWA1), Socorro, USA; Nançay Decameter Array (NDA), Nançay, France; and URAN2 telescope, Poltava, Ukraine. Baselines are 10000, 8600, and 2400 kilometers for LWA1-URAN2, NDA-LWA1, and URAN2-NDA, respectively. One Io-B and two Io-A emissions were simultaneously observed. Using cross-correlation analysis of obtained spectrograms, it was found that, as a function of lag time in a pair of two stations, Io-B (mainly S-bursts) and Io-A (L-bursts) show different kinds of cross-correlation coefficients, with sharp and broad peaks, respectively. By measuring lag times between LWA1-URAN2, NDA-LWA1, and URAN2-NDA pairs, it can be tested if either flashlight- or beacon-like beaming is emanated from Jupiter. Measurements of beaming width are also analyzed. Most probable beaming scenarios for Io-B and -A events are suggested.
