Effects on f₀F₂ of Daytime and Nighttime Sudden Commencement Storms

抄録

The effect on f₀F₂ of daytime sudden commencement and nighttime sudden commencement storms is shown for equatorial, low-, mid- and high-latitude locations. It is seen that it is the mid-latitudes which show the greatest dependence on time of sudden commencement, and larger increases of F-region ionisation are seen in the evening to midnight hours as compared to day following a storm. Such prominent differences are not seen at the other latitudes. The mid-latitude observations are interpreted in terms of neutral thermospheric winds, and magnetospheric electric fields set up during disturbed conditions.