Frequency and spectral analysis of pulsing aurora according to the data of the imaging photometer at the Verkhnetulomsky observatory

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Abstract

A Pulsating Aurora Imaging Photometers System (PAIPS) is being created using observatories of the Polar Geophysical Institute on the Kola Peninsula to study the structure of pulsating auroras (PsA) in the near ultraviolet range (300—400 nm). We presented a description of two PsA cases measured by the PAIPS system together with all-sky cameras. For the first one, a frequency analysis of the signal is given and it is shown that for an hour and a half, pulsations occur at a quasi-constant frequency of about 1 Hz. For the second one, measurements of the intensity ratio in the 337 and 391 nm wavelengths are presented. An analysis of simultaneous observations of optical cameras in the field of view of the spectrometer shows that the emission in the “on” phase is “greener”, i.e., corresponds to less energetic precipitating electrons. Stereometric observations with a camera in observatory Lovozero gives the maximum correlation coefficient for the time series of cameras at altitudes of 145—150 km and ~92 km.

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About the authors

P. A. Klimov

Lomonosov Moscow State University

Author for correspondence.
Email: pavel.klimov@gmail.com
Russian Federation, Moscow

A. A. Belov

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

B. V. Kozelov

Polar Geophysical Institute

Email: pavel.klimov@gmail.com
Russian Federation, Murmansk

A. S. Murashov

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

V. D. Nikolaeva

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

A. V. Roldugin

Polar Geophysical Institute

Email: pavel.klimov@gmail.com
Russian Federation, Murmansk

S. A. Sharakin

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

D. A. Trofimov

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

A. A. Trusov

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

K. D. Shchelkanov

Lomonosov Moscow State University

Email: pavel.klimov@gmail.com
Russian Federation, Moscow

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Supplementary files

Supplementary Files
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1. JATS XML
2. Fig. 1. Radiation intensity during PPP (a), measured by an imaging photometer integrally over the field of view in the wavelength range 300-400 nm; spectrogram of the photometer total signal (b)

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3. Fig. 2. Observations for the case of 17 March 2023 at the Verkhnetulomskiy polygon: spectrometer data - time dependence of the P391/337 ratio (left vertical axis) and photometer count rate (right axis) (a); whole-sky colour camera data - intensities by colour channels (b)

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4. Fig. 3. Dependences of R/G and B/G ratio on the intensity of the green (G) channel

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5. Fig. 4. Dependence of the envelope correlation coefficient on the cameras on the height of the projection of the spectrometer field of view

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