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Lower ionospheric electron density changes following lightning discharges

Atıcı R., Güzel E., Sağır S.

Acta Geophysica

2018

Vol. 66, no. 4

731--738

The effect of lightning-induced electromagnetic (EM) waves on electron density (Ne) of the lower ionosphere is calculated by using the four-component Glukhov–Pasko–Inan (GPI) model which is modified by including two-body attachment reactions and associative detachment with negative ions of active species (namely, O and N atoms). As a result of the calculations, it is seen that three-body attachment reactions take place at about 50–73 km altitudes, associative detachment takes place at approximately 73–85 km altitudes and two-body attachment reactions take place at approximately 85–95 km altitudes on the electron density. While the effect on electron density of electric field of lightning-induced EM wave is weak at altitudes where associative detachment is effective, it is strong at altitudes where two-body attachment reactions are effective. Also, it is shown that the electron density increases up to approximately 5.5 times when compared with the background density values due to electrons occurring as a result of associative detachment with negative ions of active species.

Numerical calculation of cosmic ray ionization rate profiles in the middle atmosphere and lower ionosphere with relation to characteristic energy intervals

Velinov P.I.Y., Asenovski S.N., Mateev L.N.

Acta Geophysica

2013

Vol. 61, no. 2

494--509

Numerical calculations of galac tic cosmic ray (GCR) ionization rate profiles are presented for the middle atmosphere and lower iono- sphere altitudes (35-90 km) for the full GCR composition (protons, alpha particles, and groups of heavier nuclei: light L, medium M, heavy H, very heavy VH). This investigation is based on a model developed by Velinov et al. (1974) and Velinov and Mateev (2008), which is further improved in the present paper. Analytical expressions for energy interval contributions are provided. An approximation of the ionization function on three energy intervals is used and for the first time the charge decrease interval for electron capturing (Dorman 2004) is investigated quantitatively. Development in this field of research is important for better understanding the impact of space weather on the atmosphere. GCRs in fluence the ionization and electric parameters in the atmosphere and also the chemical processes (ozone creation and depletion in the stratosphere) in it. The model results show good agreement with experimental data (Brasseur and Solomon 1986, Rosenberg and Lanzerotti 1979, Van Allen 1952).