Spectrum of frequency modulation of serpentine emission as a reflection of the solar fluctuation spectrum

We study frequency modulation of serpentine emission (SE), using data from the Vostok Antarctic station. It is shown that the previously observed 5-minute modulation of the SE carrier frequency is the most prominent and stable in the emission spectrum. Frequency fluctuations of this period are prese...

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Bibliographic Details
Published in:Solar-Terrestrial Physics
Main Authors: Dovbnya B.V., Klain B.I., Guglielmi A.V., Potapov A.S.
Format: Article in Journal/Newspaper
Language:English
Published: INFRA-M 2017
Subjects:
Serpentine emission
Frequency modulation
Power spectrum
Photospheric oscillations
Astrophysics
QB460-466
Antarctic
Antarc*
Online Access:https://doi.org/10.12737/article_58fd6dfaa04833.19557687
https://doaj.org/article/d4b138c674fe4dc1b6edc52738ee1d58
Description
Summary:We study frequency modulation of serpentine emission (SE), using data from the Vostok Antarctic station. It is shown that the previously observed 5-minute modulation of the SE carrier frequency is the most prominent and stable in the emission spectrum. Frequency fluctuations of this period are present in about 70 % of the total SE observation time under moderately quiet geomagnetic conditions (Kp=0–2). We performed a per-pixel processing of SE dynamic spectra and found that the power spectrum of the signal frequency modulation contains a clearly vis-ible peak at periods close to 5 minutes. A detailed study shows the emission spectrum matching the frequency range of the solar photospheric oscillations. The results of the analysis allow us to conclude that the 5-minute modulation of the SE carrier frequency can be viewed as a reflection of photospheric fluctuations with the same period that is typical for the solar eigenoscillations.

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