To create a local model of the electron density at F2 layer maximum of the ionosphere, N_mF2, over Kaliningrad, the data of the magnetic-ionospheric observatory in the Ulyanovka village (25 km from Kaliningrad) for the period 2008-2015 were used. In the model, daily (monthly) variations of N_mF2 are calculated for each month as a function of solar and geomagnetic activity. As an index of solar activity, the index F_10.7, was taken from the Web-site lasp.colorado.edu/lisird/tss/noaa_radio_flux.html, which was averaged over 27 days, including 26 days preceding the day of measurement. To describe the dependence of N_mF2 on geomagnetic activity, the daily average of the Ap index was calculated over 27 days, the data for which were taken from the Web-site wdc.kugi.kyoto-u.ac.jp/kp/index.html. For the construction of the model, 27-day median (mid-day 22) daily N_mF2 variations were obtained for 12 months of each year in the 2008-2015. For each hour of local time (LT) and every month, based on the obtained N_mF2 values and F_10.7 by the least squares method, linear regression coefficients were calculated that determine the dependence of the N_mF2 values on solar activity in the following form <N_mF2>₂₇ = a₀ + a₁ × (<F_10.7>₂₇ - 70). In this representation, the coefficient a₀ has the meaning of the N_mF2 value in the minimum of solar activity at <F_10.7> ₂₇ = 70, and the coefficient a₁ determines the N_mF2 dependence on solar activity. In addition, on the basis of the same data and averaged Ap index by the method of least squares, the coefficients of the double linear regression determining the N_mF2 dependence on the solar and geomagnetic activity from the formula <N_mF2>₂₇ = b₀ + b₁ × (< F_10.7>₂₇ - 70) + b₂ × (<Ap>₂₇ - 4). In this representation, the coefficient b₀ determines the N_mF2 values in the minimum of solar activity at <F_10.7>₂₇ = 70 and minimum of geomagnetic activity at <Ap>₂₇ = 4, the coefficient b₁ determines the N_mF2 dependence on solar activity, and the coefficient b₂ determines the N_mF2 dependence on the geomagnetic activity. For the described dependencies, the mean square deviation of the observations from the results of linear regression was calculated by the formula, where <N_mF2>₂₇ = a₀ + a₁ × (<F_10.7>₂₇ - 70) is the result of linear regression, and <N_mF2>₂₇ are the averaged values of the observation data. MSE for linear regression is not greater than MSE for a double linear regression.

In the online version of the local empirical model of the N_mF2 over Kaliningrad, the user has the opportunity to consider or not take into account the N_mF2 dependence on geomagnetic activity. To obtain the results, user must select the month from 1 to 12, set the values of solar and geomagnetic activity indices averaged over the previous 27 days. The local model calculates for the selected or each hour of LT the N_mF2 value and the standard deviation.

ACKNOWLEDGEMENTS
We thank the co-workers of the Kaliningrad Magnetic-Ionospheric Observatory for the ionospheric data and the NOAA command for providing data on the solar activity index F_10.7 ( www.ngdc.noaa.gov/stp/ GEOMAG/kp_ap.html ). The work was carried out with the financial support of the program to improve competitiveness "5-100" I. Kant BFU.

REFERENCES

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