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We describe the effect of the 6 November 2001 magnetic storm on thelow latitude thermospheric composition. Daytime red line (OI 630.0nm)emissions from Carmen Alto, Chile showed anomalous 2-3 times largeremissions in the morning (05:30-08:30 Local Time; LT) on the disturbed daycompared to the quiet days. We interpret these emission enhancements to becaused due to the increase in neutral densities over low latitudes, as adirect effect of the geomagnetic storm. As an aftereffect of the geomagneticstorm, the dayglow emissions on the following day show gravity wave featuresthat gradually increase in periodicities from around 30min in themorning to around 100min by the evening. The integrated dayglowemissions on quiet days show day-to-day variabilities in spatial structuresin terms of their movement away from the magnetic equator in response to theEquatorial Ionization Anomaly (EIA) development in the daytime. The EIAsignatures in the daytime OI 630.0nm column-integrated dayglow emissionbrightness show different behavior on days with and without the post-sunsetEquatorial Spread F (ESF) occurrence

annales geophysicae

Magnetic storm-induced enhancement in neutral composition at low latitudes as inferred by O(&amp;lt;sup&amp;gt;1&amp;lt;/sup&amp;gt;D) dayglow measurements from Chile