A study of aspect angle effects in the E-region irregularity velocity using multi-point electric field measurements

• Published in: Geophysical Research Letters
• Main Authors: Makarevich, R. A., Senior, A., Koustov, A. V., Uspensky, M., Honary, F., Dyson, P. L.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: 2006
• Subjects: Norway; EISCAT
• Online Access: https://eprints.lancs.ac.uk/id/eprint/6699/; https://doi.org/10.1029/2006GL027740

E-region irregularity velocity measured by the STARE Norway VHF radar is considered as a function of magnetic aspect angle α and EISCAT-derived electron drift velocity at 7 locations with α between 0.38° and 2.64°. It is shown that the irregularity line-of-sight (l-o-s) velocity normalized to the electron velocity component V e0 comp exhibits a decrease with an increasing aspect angle for V e0 comp exceeding 500 m/s. The rate of velocity decrease is greater than those reported previously and is close to that predicted by the linear theory of electrojet irregularities without assuming anomalously large collision frequencies.