Coupling of the Perkins instability and the sporadicElayer instability derived from physical arguments

摘要: [i] Tsunoda and Cosgrove [2001] recently pointed out that the F layer sporadic E (E s ) layers in nighttime midlatitude ionosphere must be considered electrodynamically as a coupled system light of presence Hall polarization process [Haldoupis et al., 1996; Tsunoda, 1998; 2001, 2002a] fact kilometer-scale electric fields map efficiently between regions. They further noted apparent positive feedback processes those [2002b, 2003] have since shown are unstable with properties not unlike Perkins instability region [Perkins, 1973], motivating idea two instabilities may couple. Finally, [2004] derived linear growth rate for layer, thus realizing unified formalism L) instabilities. found was significantly enhanced by coupling. However, computed expressed only largest eigenvalue very complex 3 × matrix. In this paper we present physical interpretation E-F coupled-layer (EFCL) instability, derive condition maximal We obtain circuit model provides wavelength dependence field mapping layers, allows quantitative predictions. Using rule thumb computing rates from isolated L rates. compare result exact computation 120041.