The first hyperpolarizability is studied at HF/6-31G level by coupled perturbed Hartree-Fock (CPHF) method.

PP indicates the amount of irregular vibration of vocal folds and I/F represents efficient transition from MFR to acoustic energy.

L current systems have been calculated for different lunar phases on magnetically quiet and disturbed days by use of ionospheric wind dynamo theory for different conductivity models.