Observation of HF noise in an intense aurora by the sounding rocket S-310JA-7
P(論文) 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...
| Main Authors: | , |
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| Language: | English |
| Published: |
1982
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/record/1270/files/KJ00000011905.pdf |
| Summary: | P(論文) 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. departmental bulletin paper |
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