Observations of Conjugate MSTIDs using Networks of GPS Receivers in the American Sector

Abstract:

We have used TEC values measured with several networks of GPS receivers that operate in the American sector to investigate the conjugacy properties of MSTIDs and equatorial plasma bubbles that commonly occur at these latitudes. TEC values corresponding to mid-latitude MSTIDs, also named electro-buoyance waves, map into the opposite hemisphere to ~10% of their original amplitude. Equatorial plasma bubbles sometime reach mid latitudes showing 100% conjugacy in both hemispheres. During disturbed conditions, we have observed MSTIDs, or plasma structures occurring over the Continental USA reaching latitudes that are commonly considered sub-auroral regions. We believe that the latter structures likely follow the Perkins instability and may be driven by a southward wind associated with the disturbed dynamo. We will also show data collected with satellites (CNOFS/DMSP/SWARM) passing over the southern hemisphere to diagnose the conjugacy of these structures. This paper will also discuss the physical implications of our conjugate observations.