Vertical Propagation Speeds of Gravity Waves in the Daytime as a Precursor to the Onset of Equatorial Spread-F

Subir Mandal, NERC British Antarctic Survey, Cambridge, United Kingdom, Pallamraju Duggirala, Physical Research Laboratory, Ahmedabad, India and Tarun K Pant, Space Physics Laboratory,Vikram Sarabhai Space Centre,Indian Space Research Organaisation, Trivandrum, India