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

Solar-Terrestrial Physics

Dovbnya Boris¹ 

关键词: serpentine emission;    frequency modulation;    power spectrum;    photospheric oscillations;   

DOI  :  10.12737/article_58fd6dfaa04833.19557687

学科分类：天文学(综合)

来源: INFRA-M

【 摘 要 】

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 visi-ble peak at periods close to 5 minutes. A detailed study shows the emission spectrum matching the frequency range of the solar photospheric oscilla-tions. The results of the analysis allow us to conclude that the 5-minute modulation of the SE carrier fre-quency can be viewed as a reflection of photospheric fluctuations with the same period that is typical for the solar eigenoscillations.

【 授权许可】

CC BY-NC-ND