Sudden stratospheric warming event signatures in daytime ExB drift velocities in the Peruvian and Philippine longitude sectors for January 2003 and 2004

Abstract

This paper first describes the technique that has been developed to obtain realistic, daytime, vertical ExB drift velocities in the equatorial ionosphere using two ground‐based magnetometers, one on the magnetic equator and the other located ±6°–9° away in latitude. This technique is then employed to study the unique ExB drift signatures associated with sudden stratospheric warming events (SSW) in both the Peruvian and Philippine longitude sectors, occurring in January 2003 and January 2004. It is found that the semidiurnal shaped signature first appears in the Peruvian sector and 3 days later appears in the Philippine sector. In both sectors, the ExB drift signature lasts for approximately 5 days.