The effect of auroral disturbances on the propagation of very low frequency signals from the RSDN-20 radio navigation system

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We presented the results of the analysis of VLF signals of the RSDN-20 radio navigation system recorded at Lovozero, Verkhnetulomsky (both on the Kola Peninsula) and Barentsburg (Svalbard Archipelago) observatories. We found events of an unusual decrease in the amplitude of the horizontal magnetic field at night ionospheric conditions, which occurred during substorms with the AL index below –500 nT. The cases, when optical observations were available during the substorm according to which auroral precipitation were registered, are considered. The observed effect is probably associated with local fluctuations in the electron density profile of the lower ionosphere caused by auroral precipitations during a substorm.

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Sobre autores

A. Larchenko

Polar Geophysical Institute

Autor responsável pela correspondência
Email: alexey.larchenko@gmail.com
Rússia, Apatity

A. Nikitenko

Polar Geophysical Institute

Email: alexey.larchenko@gmail.com
Rússia, Apatity

O. Lebed

Polar Geophysical Institute

Email: alexey.larchenko@gmail.com
Rússia, Apatity

S. Pilgaev

Polar Geophysical Institute

Email: alexey.larchenko@gmail.com
Rússia, Apatity

Yu. Fedorenko

Polar Geophysical Institute

Email: alexey.larchenko@gmail.com
Rússia, Apatity

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2. Fig. 1. Case 1: radial (red line) and tangential (blue) components of the magnetic field of the KRS (a), NOV (b), and KHA (c) transmitters registered in LOZ, and geomagnetic activity indices: (d) SYM-H (blue line) and Kp (red bars), (e) AE (blue line) and AL (red) indices

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3. Fig. 2. Case 1: radial (red line) and tangential (blue) components of the magnetic field of the KRS (a), NOV (b), and KHA (c) transmitters recorded in the BAB

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4. Fig. 3. Case 2: radial (red line) and tangential (blue) components of the magnetic field of the KRS (a), NOV (b), and KHA (c) transmitters registered in LOZ, and geomagnetic activity indices: (d) SYM-H (blue line) and Kp (red bars), (e) AE (blue line) and AL (red) indices

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5. Fig. 4. Case 3: amplitudes of the KRS transmitter field components recorded at LOZ and BAB between 25 February and 14 March 2017 and geomagnetic activity indices

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6. Fig. 5. For 19:00 UT on 21 March 2017: image of the all-sky camera of the Lovozero Observatory (a) and the position of the polar lights oval relative to the traces of propagation of transmitter signals obtained from the model of precipitations (b)

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