An evaluation of duct-life times from low latitude ground observations of whistlers |
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| Authors: | Manoranjan Rao |
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| Institution: | Space Physics Division, Space Science & Technology Centre, Trivandrum 695022, India;Electronics & Radio Physics Section, Department of Physics, Banaras Hindu University, Varanasi 221005, India |
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| Abstract: | On certain occasions, whistler rate occurrences at Gulmarg (24°N geomagnetic) and Naini Tal (19°N geomagnetic) are found to exhibit some periodicity. Power spectrum analyses of the occurrence rates yield a dominant period of about 1 hr. It is suggested that this period is an indication of the duct-life times at low L-values. Dispersion analyses of the whistlers have qualitatively confirmed the existence of separate ducts during the period of observation. It is pointed out that power spectrum analyses may not be applicable to whistler data corresponding to high L-values. |
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