*Physics o fAuroral Phenomena”, Proc. XXXVII A nnual Seminar, Apatity, p. 112, 2014 © Kola Science Centre, Russian Academy of Science, 2014 Polar Geophysical Institute CORRECTIONS TO THE REPORT "SOUTHERN BOUNDARY OF THE ULTRARELATIVISTIC ELECTRON PRECIPITATION ON MAY 1 3 ,1987м, PROC. XXXVI ANNUAL SEMINAR “PHYSICS OF AURORAL PHENOMENA”, APATITY, PP. 163 - 165, 2013 G.F. Remenets, A.M. Astafiev (Physics Department o f St.-Petersburg State University, Russia) The pointed report contains a mistake. All experimental phase variations were accidentally multiplied by 2. Solutions of the VLF problem of first and second kind for true input data are presented on Fig. 1 and Fig. 2 below. The first part of the disturbance (before 17:00) was gotten in an analysis with positive direction of time and with the determination of the initial values h(t0) and R(to), where t0 - 16:30 UT. The second part of the disturbance (after 17:00) was gotten in an analysis with negative direction of time and with the determination of the initial values for analysis h ( t j and R (tJ, where t,„ - 18:30 UT. A discrepancy function GII(D) was minimized relative to the value of D, distance between the receiver and the southern boundary of a disturbance. The minimum was achieved at the relative distance D/S2 = (26 ± 5) % and for the latitudes (64.5 ± 1)° N correspondingly, were S=2497 km. A discrepancy-fimction GII(D), which contained only phase data, was minimized too, and the corresponding result was practically the same: D/S2 = (23 ± 5)%; (65 ± 1)° N. Calculations for the discrepancy-function GII(D), which contained only the amplitude data, gave the following result: D/S2 = (47 ± 5)%; (61.5 ± 1)° N. Figure 1. True variations of the effective height h(t) (left) and the reflection coefficient modular R(t) (right) of a wave-guide, as functions of universal time (UT) for the auroral radio path Aldra- Apatity. Figure 2. Accuracy of the inverse VLF problem solutions of second kind. Experimental and calculated data are compared. Black line - experimental data; red line - calculated data with optimal value of D = 650 km; blue line- calculated data with optimal value of D = 1175 km (left) and D = 570 km (right) 1 1 2

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