E.Yu. Zykov

The influence of lower atmosphere dynamics on the mid-latitude sporadic E-layer

Abstract The relationship between the occurrence of intense sporadic-E layers and features of tropospheric weather has been investigated. It has been found that, as certain features of the tropospheric pressure field (as identified from meteorological charts) develop over specific geographic regions, the probability of intense sporadic-E layers increases. Investigating the 500 mb chart has shown that the probability of occurrence of intense sporadic-E layers increases in response to distortion of patterns of zonal westerly flows.

Observation of irregularities dynamics by vertical and quasi-vertical sounding

Based on comparative analysis of the A and H plots collected from the ionograms of vertical and quasi vertical sounding you can get information about spatial and temporal changes. The ionosonde sensitivity to irregularities ΔN / N ~5*10, sensing period 1 minute, distance between ionosondes 30 km. It is allows to investigate fast-flowing (with periods of 5-20 min) and small-scale irregularities of the ionosphere.

Spring stratospheric circulation transition and mid-latitude sporadic E-layer

Abstract Using ionospheric data from a 32-year period for 8 mid-latitude stations within the European part of Russia, the dependence of intensity of an sporadic-E layer during the summer period on the start date of the spring seasonal transition of zonal circulation in the stratosphere was investigated. In those years with an early circulation transition, the sporadic-E layer intensity was increased by a factor 1.5 compared with years with a late circulation transition.