Numerical analysis of electron density and response time delay during solar flares in mid-latitudinal lower ionosphere

Abstract

Impacts of solar flare vary at different parts of the lower ionosphere depending on its proximity to the direct exposure of incoming solar radiation. The quantitative analysis of this phenomenon can be attributed to the solar zenith angle (chi(t)) profile over the ionosphere. We numerically solve the electron continuity equation to obtain the lower ionospheric electron density profile (Ne(t)). The electron production rate (q(t)) is governed by the (i) X-ray profile (phi(t)) of the flare, (ii) chi(t)-values during the flare occurrence, etc. For analyzing the X-ray profile during flares, we use the GOES-15 satellite observations. Since we are working on an electron continuity equation based simplified ionospheric model, we confined our analysis to the comparatively stable mid-latitude ionosphere only. We choose three flares each from C, M, and X-classes for Ne(t)-profile computation. We observe that temporal Ne(t)-profiles differ when computed for the lower ionosphere over different discrete latitudes. Further, we compute the spatial Ne(t)-profile across the mid-latitude region at the time when phi(t) = phi_max. Now we assume that these flares repeat themselves every day of a year (DoY) at the same time of a day and we compute Ne(t)-profiles for each day. We found a seasonal effect on the Ne(t)-profile due to solar flare. Further, we investigate the response time delay (Delta t) of the lower ionosphere, which is the time difference between incidence of X-ray and the respective change in Ne(t)-profiles during solar flares. Strong seasonal effects on Ne(t)-profile and Delta t are the unique results of this work.

References in corpus (5)

• Effective recombination coefficient and solar zenith angle effects on low-latitude D-region ionosphere evaluated from VLF signal amplitude and its time delay during X-ray solar flares
• Sensing the Earth's low ionosphere during solar flares using VLF signals and GOES X-ray data
• Effective electron recombination coefficient in ionospheric D-region during the relaxation regime after solar flare from February 18, 2011
• Modeling D-Region Ionospheric Response of the Great American TSE of August 21, 2017 from VLF signal perturbation
• Inverse problem in Ionospheric Science: Prediction of solar soft-X-ray spectrum from Very Low Frequency Radiosonde results

Cited by in corpus (4)

• Solar Flare Effects on the Earth's Lower Ionosphere
• On the altitude profile of lower ionospheric D-region response time delay during solar flares
• Investigating a Characteristic Time Lag in the Ionospheric F-region's Response to Solar Flares
• Modeling of the variability of D-region ionospheric electron density during solar cycle-24