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We present occurrence rate statistics for nighttime medium-scale travelingionospheric disturbances (MSTIDs) in the Central Pacific and South Americansectors using data collected by 630.0 nm filtered CCD imaging systems. Thedata were collected from September 2006 through December 2012. In general,the statistics are in good agreement with the basic linear theory of MSTIDs,with observations coinciding with low F10.7A values, representative of solarminimum. Overall, MSTIDs are observed in approximately 68% of the usablenights near the solstices at mid-latitudes and approximately 20% of theusable nights for equinox periods. Observations closer to the geomagneticequator yielded a maximum occurrence rate of about 10–20% during thesolstices and about 0–3% during the equinoxes. The lower number of MSTIDobservations near the low latitudes is attributed to limitations of MSTIDgrowth rate, propagation, and/or geometrical observational effects. Therelatively large number of MSTID occurrences during the solstices can beaccounted for by the neutral wind contribution to the MSTID growth rateeither at the local or magnetic conjugate point

Climatology of nighttime medium-scale traveling ionospheric disturbances (MSTIDs) in the Central Pacific and South American sectors