On the spectrum of mid-latitude sporadic-E irregularities

Yu. V. Kyzyurov (1)

1 MAO - Main Astronomical Observatory of NAS of Ukraine

We discuss the creation of mid-latitude sporadic-E plasma irregularities (with length-scales smaller than sporadic layer thickness) by the neutral atmosphere turbulence. Using fluid equations, the relation between plasma density fluctuations and the velocity field of neutrals is derived. After a brief discussion of the relevant neutral turbulence, the analytical expression for the power spectrum of plasma irregularities is obtained. This expression allows a power-law type of experimental irregularity spectra (the spectral index depends on sporadic-E characteristics) and possible departures in detail of the irregularity spectra from the power-law form to be explained. In addition, it allows us to make estimates of length-scales at which such departures must occur.

Key words: Ionosphere (ionospheric irregularities; mid-latitude ionosphere) ? Space plasma physics (turbulence)

Domaines: Océan, Atmosphère; Sciences de la Terre

Yu. V. Kyzyurov. On the spectrum of mid-latitude sporadic-E irregularities. Annales Geophysicae, 2000, 18 (10), pp.1283-1292. ⟨hal-00316800⟩