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The lateral density distributions (LDD) of inclined cosmic ray air shower areasymmetric and the corresponding iso-density contours are of increasingeccentric ellipses with zenith angles of different showers. The polar asymmetryof the iso-density contours introduces a significant shift of the EAS core,which is quantitatively expressed as a gap length (GL) parameter between theEAS core and the center of the modified density pattern consisting of severalequi-density ellipses. The LDD of EAS particles is usually approximated by aparticular type of lateral density function (LDF) which is generally assumed tobe polar symmetric about the EAS axis, and cannot describe the asymmetric LDDsaccurately. A polar angle-dependent modified lateral density function of EASshas been derived analytically by considering the effect of attenuation of EASparticles in the atmosphere. From the simulation studies, it has been foundthat the GL manifests sensitivity to the cosmic ray mass composition. Thecosmic ray mass sensitivity of the lateral shower age is also re-examined byapplying the modified LDF to the simulated data.

Probing the magnitude of asymmetries in the lateral density distribution of electrons in EAS