Climatology of medium‐scale traveling ionospheric disturbances observed by the midlatitude Blackstone SuperDARN radar

摘要: A climatology of daytime midlatitude medium-scale traveling ionospheric disturbances (MSTIDs) observed by the Blackstone Super Dual Auroral Radar Network (SuperDARN) radar is presented. MSTIDs were primarily from fall through spring. Two populations observed: a dominant population heading southeast (centered at 147° geographic azimuth, ranging 100° to 210°) and secondary northwest −50° −75° −25°). Horizontal velocities ranged 50 250 m s−1 with distribution maximum between 100 150 s−1. wavelengths 500 km peak km, periods 23 60 min, suggesting that may be consistent thermospheric gravity waves. local time (LT) dependence was such (southeastward) decreased in number as day progressed until late afternoon increase. The (northwestward) appeared only afternoon, possibly indicative neutral wind effects or variability sources. LT not other parameters. Possible solar-geomagnetic tropospheric MSTID sources considered. auroral electrojet (AE) index showed correlation statistics. Reverse ray tracing HINDGRATS model indicates has source regions over Great Lakes near geomagnetic cusp, while region 100 km above Atlantic Ocean east Carolinas. This suggests come favorable either sources, originates waves generated via lower atmospheric convection.