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Kojima^Hirotsugu

Low frequency component of the broadband electrostatic noise




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1 #¬“ˆ^_Žk Kojima^Hirotsugu ‹ž“s‘åŠw ’´‚‘w“d”gŒ¤‹†ƒZƒ“ƒ^[ Radio Atmospheric Science Center, Kyoto University
2 ¼–{^h Matsumoto^Hiroshi ‹ž“s‘åŠw ’´‚‘w“d”gŒ¤‹†ƒZƒ“ƒ^[ Radio Atmospheric Science Center, Kyoto University
3 ‘呺^‘PŽ¡ Omura^Yoshiharu ‹ž“s‘åŠw ’´‚‘w“d”gŒ¤‹†ƒZƒ“ƒ^[ ‚«‚傤‚Æ‚¾‚¢‚ª‚­‚¿‚傤‚±‚¤‚»‚¤‚Å‚ñ‚Ï‚¯‚ñ‚«‚イ‚¹‚ñ‚½[
4 ’·–ì^—E Nagano^Isamu ‹à‘ò‘åŠw HŠw•” Faculty of Engineering, Kanazawa University

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abstract:
Broadband spectral structures of the Broadband Electrostatic Noise BEN) have been the main difficulties to study its generation mechanism.The Geotail waveform observations of the BEN revealed that the solitary waveforms called Electrostatic Solitary Waves (ESW) mainly contribute to the high frequency portion of the BEN spectra. On the other hand, the low frequency component of the BEN have different natures from those of the ESW. For example, the electric field polarization of the low frequency component is perpendicular to the ambient magnetic field.In the present paper,we will introduce the natures of the low frequency component of the BEN and discuss their generation mechanisms.

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Keywords:
Broadband Electrostatic Noise,Geotail,Plasma sheet