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The present study explores the ionospheric effects of the well cited solarflare events (M3.2, M3.9/2N) of 18 November 2003 associated with CMEs. TheH{\alpha} observations of these flares (taken with 15 cm Solar Tower Telescopeat ARIES, Nainital) have been analysed to see an association of these flareevents with the geomagnetic storm occurred on 20 November 2003. The ionosphericdata from Puerto Rico (18.5{\deg}N, 67.2{\deg}W), Dyess (32.4{\deg}N,99.7{\deg}W) and Millstone Hill (42.6{\deg}N, 71.5{\deg}W) together with thedisturbance storm time indices (Dst index) variability exhibited acorresponding associations having a delay in the solar wind parameters,triggered by these flare events.

Ionospheric response to the space weather event of 18 November 2003 -- An investigation