Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 29510 10.12737/stp-52201911 Results of current research Results of current research Results of current research Ionospheric effects of two solar flares in the maximum of solar cycle 23 and in the minimum of solar cycle 24 Ionospheric effects of two solar flares in the maximum of solar cycle 23 and in the minimum of solar cycle 24 Смирнов Владимир Михайлович Smirnov Vladimir Mihaylovich vsmirnov@ire.rssi.ru Смирнова Елена Владимировна Smirnova Elena Vladimirovna Институт радиотехники и электроники им. В.А. Котельникова РАН Фрязино Россия Kotelnikov IRE RAS Fryazino Russian Federation ИРЭ им. В.А. Котельникова РАН Россия ИРЭ им. В.А. Котельникова РАН Russian Federation ИРЭ им. В.А. Котельникова РАН Фрязино Россия ИРЭ им. В.А. Котельникова РАН Фрязино Russian Federation 5 2 76 80 https://zh-szf.ru/en/nauka/article/29510/view

Using data from the GPS and GLONASS navigation satellite systems, we analyze the responses of the mid-latitude ionosphere to the extreme solar flares that occurred at the maximum of solar cycle 23 (October 28, 2003) and at the minimum of solar cycle 24 (September 6, 2017) during the same season at close solar zenith angles. To obtain the response, we use the rate of change of the total electronic content, which is practically independent of characteristics of equipment and is determined only by parameters of a propagation medium (the ionosphere in our case). The ionospheric response is shown to be almost independent of the total duration of the flare. In both cases, the duration of the main response at a level of 0.5 is about 1.5–2 min, whereas the total duration of the response is about 10 min and fairly independent of solar flare importance.

Using data from the GPS and GLONASS navigation satellite systems, we analyze the responses of the mid-latitude ionosphere to the extreme solar flares that occurred at the maximum of solar cycle 23 (October 28, 2003) and at the minimum of solar cycle 24 (September 6, 2017) during the same season at close solar zenith angles. To obtain the response, we use the rate of change of the total electronic content, which is practically independent of characteristics of equipment and is determined only by parameters of a propagation medium (the ionosphere in our case). The ionospheric response is shown to be almost independent of the total duration of the flare. In both cases, the duration of the main response at a level of 0.5 is about 1.5–2 min, whereas the total duration of the response is about 10 min and fairly independent of solar flare importance.

 ionosphere solar flares navigation satellite systems radio translucence method electron content ionosphere solar flares navigation satellite systems radio translucence method electron content

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