Determination of the Velocity of Ionospheric Disturbances from the Dynamics of Additional U-Shaped Traces on Ionograms

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One of the approaches to solving the inverse problem of determining the parameters of ionospheric disturbances is the multiple solution of the “homing-in” problem with the subsequent comparison of the simulation results with the observed data (ionograms). However, this approach is usually associated with significant calculation time costs, which makes it impossible to process large arrays of sounding data. The method described in this paper makes it possible to quickly determine the horizontal velocity of the ionospheric disturbance by descent rate of an additional U-shaped trace moving to lower virtual heights on the vertical ionograms: in order to calculate the velocity, it is proposed to use the results of the ray tracing obtained for the reference background profiles with the disturbances superimposed on them.

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作者简介

O. Laryunin

Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: laroleg@iszf.irk.ru
俄罗斯联邦, Irkutsk

V. Kurkin

Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences

Email: kurkin@iszf.irk.ru
俄罗斯联邦, Irkutsk

A. Rybkina

Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences

Email: rybkina@iszf.irk.ru
俄罗斯联邦, Irkutsk

A. Podlesnyi

Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of Sciences

Email: pav@iszf.irk.ru
俄罗斯联邦, Irkutsk

参考

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2. Fig. 1. Altitude dependences of the plasma frequency.

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3. Fig. 2. Ray trajectories corresponding to lateral reflection.

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4. Fig. 3. Fragments of experimental ionograms from 04.11.2012. The dotted lines on the bottom panel show the levels of the sickle minima.

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5. Fig. 4. Sliding of synthesized sickles according to a quasi-linear law.

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6. Fig. 5. The sequence of synthesized sickles obtained for the background profile shown in Fig. 1 (curve 2).

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7. Fig. 6. Changing the height of the maximum height profile.

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8. Fig. 7. Fast and slow decline of the sickle for two different background profiles (a) and (b) (Fig. 6) with the same shift of the disturbance by 15 km.

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9. Fig. 8. Conversion coefficient from the rate of sliding of the sickle to the rate of horizontal movement of the disturbance as a function of the height of the maximum of the background layer.

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10. Fig. 9. Histogram of the velocity distribution of horizontal motion of ionospheric disturbances.

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