Effects of magnetohydrodynamic waves in Jovian decametric emission

被引：4

作者：

Arkhypov, O. V.

Rucker, H. O.

机构：

[1] Natl Acad Sci Ukraine, Inst Radio Astron, UA-61002 Kharkov, Ukraine

[2] Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria

来源：

ASTRONOMY & ASTROPHYSICS | 2007年 / 474卷 / 03期

关键词：

planets and satellites : individual : Jupiter; radio continuum : solar system; magnetohydrodynamics (MHD); waves; plasmas; instabilities;

D O I：

10.1051/0004-6361:20078066

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The flux variability of Jovian decametric radio emission (DAM) is analyzed to search for its possible modulations by magnetohydrodynamic waves of ultra-low frequencies (ULF). The ULF modulating waves are found in DAM dynamic spectra as a moving pattern (moire) on the background of Jovian millisecond radio bursts (S-bursts). Their frequency drift (similar to 55 MHz/s) corresponds to the wave motion to Jupiter with Alfven velocity (similar to 4 x 10(4) km s(-1)). There are whistler-like drifting details in the dynamic power spectra of ULF variations of S-burst emission flux at fixed radio frequency. Their frequency drift rates are consistent with whistlers that are dispersed mainly in the Io torus. Formally our analysis of DAM reveals the specific 2s-modulation of S-burst emission corresponding to the known magnetic pulsations near gyrofrequencies of heaviest ions (SO2+ and SO+) in the Io torus.

引用

页码：1031 / 1035

页数：5

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