[P-CG38_1PM2] 惑星大気圏・電磁圏

[PCG38-25] LWA1で観測された木星電波Io-Cモジュレーションレーンについて(2)

*今井 一雅¹、島内 良章¹、Clarke Tracy²、Higgins Charles A.³、今井 雅文⁴ (1.高知工業高等専門学校、2.Naval Research Laboratory、3.Middle Tennessee State University、4.京都大学)

キーワード：木星電波, デカメートル波, モジュレーションレーン, 電波源, 電波放射機構, LWA1

The Long Wavelength Array (LWA) is a low-frequency radio telescope designed to produce high-sensitivity, high-resolution images in the frequency range of 10-88 MHz. The Long Wavelength Array Station 1 (LWA1) is the first LWA station completed in April 2011, and is located near the VLA site in New Mexico, USA. LWA1 consists of a 256 element array, operating as a single-station telescope. Each LWA1 beam provides dual orthogonal linear polarizations such that it is possible to reconstruct the full Stokes parameters for each tuning. The first Jupiter radio observation using LWA1 was made by Tracy Clarke (PI) from December, 2011. The initial analyses of Io-A/C, Io-B, and Io-D event, show many spectral features such as S-bursts, narrow-band events (N-bursts), as well as modulation lanes and Faraday lanes.The modulation lanes in Jupiter's decametric radiation, which were discovered by Riihimaa [1968], are groups of sloping parallel strips of alternately increased and decreased intensity in the dynamic spectral plots. We present LWA1 observations of modulations lanes detected across a Jovian decametric Io-C burst that contains both right hand circular and left hand circular emission. The modulation lanes cross both handedness of polarization, suggesting that the emissions may be coming from the same hemisphere. These results add important information regarding the emission mechanism of Jupiter's decametric emissions.