Variations in Number of Lightning Discharge Radio Pulses by Observations in Yakutsk

• Published in: Bulletin of the South Ural State University series "Mathematics. Mechanics. Physics"
• Main Authors: Козлов, Владимир Ильич, Корсаков, Алексей Анатольевич, Тарабукина, Лена Дмитриевна, Дуюкова, Нарыйа Семеновна
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: South Ural State University 2017
• Subjects: atmospherics; thunderstorm activity; solar activity; radio wave propagation; galactic cosmic rays; атмосферик; грозовая активность; солнечная активность; распространение радиоволн; галактические космические лучи; Yakutsk
• Online Access: https://vestnik.susu.ru/mmph/article/view/5929; https://doi.org/10.14529/mmph170107

The main natural source of very low-frequency radiation (LFR: 3–30 kHz) is a lightning discharge which generates radio pulses, namely atmospherics. The atmospherics were registered in the period from 2001–2015 30 km away from Yakutsk (62N; 129,72 E) in the context of industrial noise-free environment. A receive path corresponds to a band of ground lightning discharge’s energy concentration: 0,3–10 kHz. The threshold level of a field, received by a frame antenna ~2 mV/m, which provides an opportunity to register radio pulses at night propagation conditions is up to ~6 000 km. The specific period of a daily variation: minimum 3–7 UT (minimum thunderstorm activity, maximum radio signal attenuation); the summer maximum 8–12 UT (influence of local thunderstorms, maximum signal attenuation); the winter and summer maximum 15–19 UT (minimum attenuation in radio signal propagation). The variation of maximums 17 h (UT) – 230 % (summer to winter) and 9 h (UT) – 2 600 % (local thunderstorms in summer). The 11-year variation is a half-wave with the maximum of 1 year earlier than the minimum of solar activity. The flow of atmospherics is in an antiphase with the solar activity and in a phase with the variation of cosmic rays. From the maximum to the minimum of the solar activity (2001–2007) the change of radio pulse flow 3–7 UT has comprised 59 and 13 times; 15–19 UT comprised 38 and 5 times; 8–12 UT comprised 34 and 8 in winter and summer, respectively. According to our observations, by registering radio signals of a radio navigation system RSDN-20, in the radio path Novosibirsk – Yakutsk the change of attenuation from the minimum to the maximum of the solar activity is 120 %. Taking into account the propagation, the ratio between the number of atmospherics, accepted in the minimum of the solar activity (2009) and the maximum (2013) for summer months is 159 %. По данным часового счета атмосфериков, регистрируемых непрерывно в окрестностях Якутска с 2001 по 2015 г., с учетом вклада распространения, установлено, что отношение между количеством атмосфериков в минимуме и максимуме солнечной активности составляет около 159 % (лето). В Северной Азии вариация грозовых разрядов находится в фазе с вариацией галактических космических лучей и противофазна солнечной активности