Characteristics of low latitude ionospheric E-region irregularities linked with daytime VHF scintillations measured from Varanasi

Journal of Earth system science

R P Singh1 3²  A K Singh1²  K Patel1²  R P Patel2¹ 

[1] Department of Physics, M.M.H. P.G. College, Ghaziabad, India.$$;Atmospheric Research Laboratory, Department of Physics, Banaras Hindu University, Varanasi 221 005, India.$$

关键词: Daytime scintillations;    ionospheric E-region irregularities;    ionospheric propagation;    wave propagation.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

VHF amplitude scintillations recorded during the daytime period from January 1991 to December 1993, April 1998 to December 1999 and January 2008 to December 2008 at low latitude station Varanasi (geographic lat. = 25° 15′N; long. = 82° 59′E; geomagnetic lat. = 14° 55′N, long. = 154°E, dip angle = 37.3°, sub-ionospheric dip = 34°) have been analyzed to study the behaviour of ionospheric E-region irregularities during the active solar and magnetic periods. The autocorrelation functions, power spectral densities, signal de-correlation times are computed to study the temporal features of ionospheric E-region irregularities linked with daytime scintillations. Derived spectral index ranges between −2 and −9. Assuming velocity of irregularities, the characteristic lengths of the E-region irregularities are estimated. We have estimated the minimum and maximum range of scale length of sporadic-E (𝐸𝑠) irregularities to be observed over Varanasi. These results are in close agreement with those reported from this latitude region.

【 授权许可】

Unknown