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Solnechno-Zemnaya Fizika
Journals / Solnechno-Zemnaya Fizika / Volume 8 Issue 1 / Long-term trend of the ionospheric E-layer response to solar flares
UDC 55

LONG-TERM TREND OF THE IONOSPHERIC E-LAYER RESPONSE TO SOLAR FLARES Long-term trend of the ionospheric E-layer response to solar flares

Published in Solnechno-Zemnaya Fizika · Volume 8, Issue 1 · Pages 51–57 · Rubric: Results of current research
DOI: https://doi.org/10.12737/szf-81202206
Received: 23.06.2021 Accepted: 08.12.2021 Published: 25.03.2022 Language of publication: RUS
Authors
GI
Givi Givishvili
ORCID
LI
Liudmila Leshchenko
ORCID
ABSTRACT
Using data from ground-based vertical sounding of the ionosphere (VS) at the station Moscow and five Japanese stations for the period from 1969 to 2015, we have examined the long-term response of the E layer to solar X-ray flares. The analysis relies on the previously developed method for estimating the ratio between rates of ionization by X-rays qx and ultraviolet radiation qu during flares. We confirmed the existence of a long-term (at least covering the 45-year observation period) increase in the proportion of X-rays in the total ionization rate of the ionospheric E layer, characterized by the ratio qx/q, where q=qx+q. The qx/q ratio is shown to increase throughout the period of interest at a rate independent of the solar activity cycle. There is also no dependence of the qx/q trend rate on the season, latitude (26°–56° N), and longitude (37°–28° E).
KEYWORDS
ionospheric E layer, vertical sounding, solar flares, long-term trend
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