The Institute of Space and Astronautical Science
The Institute of Space and Astronautical Science
抄録(英)
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.
雑誌書誌ID
AA00733561
雑誌名
Memoirs of National Institute of Polar Research. Special issue
Observation of HF noise in an intense aurora by the sounding rocket S-310JA-7
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KJ00000011905
(1.6MB)
概要
