Behavior of Parameters of Enhancements in the Nighttime Electron Concentration in the Ionospheric F2 Layer
We have analyzed the behavior of the F2 layer parameters during nighttime periods of enhanced electron concentration by the results of vertical sounding of the ionosphere carried out with five-minute periodicity in Almaty (76°55′ E, 43°15′ N) in 2001–2012. The results are obtained within the frameworks of the unified concept of different types of ionospheric plasma disturbances manifested as variations in the height and half-thickness of the layer accompanied by an increase and decrease of N m F2 at the moments of maximum compression and expansion of the layer. A good correlation is found between height h Am , which corresponds to the maximum increase, and layer peak height h m F, while h Am is always less than h m F. The difference between h Am and h m F linearly increases with increasing h m F. Whereas the difference is ~38 km for h m F = 280 km, it is ~54 km for h m F = 380 km. Additionally, the correlation is good between the increase in the electron concentration in the layer maximum ΔN m and the maximum enhancement at the fixed height ΔN; the electron concentration enhancement in the layer maximum is about two to three times lower than its maximum enhancement at the fixed height.
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- Bailey, G.J., Sellek, R., and Balan, N., The effect of interhemispheric coupling on nighttime enhancement in ionospheric total electron content winter at solar minimum, Ann. Geophys., 1991, vol. 9, no. 9, pp. 738–747.Google Scholar
- Hocke, K. and Schlegel, K., A review of atmospheric gravity waves and traveling ionospheric disturbances: 1982–1995, Ann. Geophys., 1996, vol. 14, no. 9, pp. 917–940.Google Scholar
- Liu, L., Le, H., Wan, W., Sulzer, M.P., Lei, J., and Zhang, M.-L., An analysis of the scale heights in the lower topside ionosphere based on the Arecibo incoherent scatter radar measurements, J. Geophys. Res., 2007, vol. 112, A06307. doi 10.1029/2007JA012250Google Scholar
- Lynn, K.J.W., Gardiner-Garden, R.S., and Heitmann, A., The spatial and temporal structure of twin peaks and midday bite out in foF2 (with associated height changes) in the Australian and South Pacific low midlatitude ionosphere, J. Geophys. Res.: Space Phys., 2014, vol. 119. pp. 10294–10304. doi 10.1002/2014JA020617CrossRefGoogle Scholar
- Lynn, K.J.W., Gardiner-Garden, R.S., and Heitmann, A., The observed compression and expansion of the F2 ionosphere as a major component of ionospheric variability, Radio Sci., 2016, vol. 51. doi 10.1002/2016RS006036Google Scholar
- Mikhailov, A.V., Depueva, A.Kh., and Leschinskaya, T.Yu., Morphology of quiet time F2-layer disturbances: High to lower latitudes, Int. J. Geomagn. Aeron., 2004, vol. 5, GI1006. doi 10.1029/2003GI000058Google Scholar
- Titheridge, J.E., Ionogram Analysis with the Generalized Program POLAN, Boulder: National Data Center, 1985.Google Scholar