Observation of HF noise in an intense aurora by the sounding rocket S-310JA-7

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概要

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• Observation of noise in the frequency range from 0.6 to 7.6MHz has been made in an auroral plasma up to approximately 220km by an instrument (PWN-H) on board the S-310JA-7 sounding rocket. This rocket was launched at 1915 : 50 UT on March 27,1978 from Syowa Station in Antarctica, just prior to an intense auroral substorm (magnetic H component decrease=-700nT and 30MHz CNA=-5dB). The observed HF emissions are classified into three types according to their frequency ranges and spectral shape; 1) High level and narrow band signals whose frequencies are nearly equal to n(ƒ)_<ce> or (n+1/2)(ƒ)_<ce>, where n is an integer and (ƒ)_<ce> is the electron gyrofrequency. 2) A low level broad band emission whose upper-limiting frequency is below the local electron plasma frequency. 3) Signals at frequencies below f_<ce>. Excitation mechanism of these waves in the aurora is discussed.

• 国立極地研究所の論文
• 1982-09-00

著者

• NAKAMURA Yoshiharu

  The Institute of Space and Astronautical Science

• Nomura Yuzi

  The Institute of Space and Astronautical Science

関連論文

• Behavior of Time-Resolved Ion Energy Distribution Functions during Ion-Ion Instability
• Suppression of Ion-Ion Instabilities Excited by an Obliquely Injected Ion Beam
• Self Refraction of Nonlinear Ion Acoustic Waves
• Abonormal Depression of a Rocket's Potential Accompanied by Low-Frequency Fluctuations of the Electron Density and Electric Field in the E-Region
• Remote Excitation of Electron Plasma Waves by a Modulated Laser Beam
• Observation of HF noise in an intense aurora by the sounding rocket S-310JA-7

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