• Hari Om Upadhyay

      Articles written in Journal of Earth System Science

    • Generation of low-frequency oscillations in the subsolar venus ionopause

      R N Singh Hari Om Upadhyay

      More Details Abstract Fulltext PDF

      The steep electron density gradient, the magnetic field curvature and the effect of gravity make the Venus ionopause region unstable. The onset of flute instability in the Venus ionopause plasma has been studied. The dispersion of waves and their growth have been studied using in situ measured data. The existence of low frequency waves in the subsolar magnetic field data ionopause region has been interpreted to arise as the result of flute instability.

    • Lightning-generated waves escaping out through plasma holes in the nightside Venus ionosphere

      R N Singh Hari Om Upadhyay

      More Details Abstract Fulltext PDF

      The plasma waves in the Venus ionosphere measured by OEFD aboard PVO are analysed. It is shown that these waves are generated by lightning like cloud-to-cloud discharges anywhere in the Venus ionosphere-surface waveguide. The theoretical minimum attenuation for waveguide mode propagation at 5.4 kHz is consistent with the maximum occurrence rate at this frequency. The lightning-generated and globally-propagating signals when encountered with plasma holes or ion-trough structures escape out partially and are detected by the OEFD aboard PVO. The 100 Hz signals can propagate upwards in whistler mode. Even the localized electrostatic mode waves would be converted into electromagnetic waves in the plasma holes and ion-trough regions.

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