Abstract
Recently, Walker et al. (1979) have shown the suitability of the Scandinavian twin auroral radar experiment facility for Pc 5 pulsation studies. They consider that in the ionosphere the hydromagnetic wave causing the geomagnetic pulsation produces a periodic electric field superimposed on the ambient background field. In this paper STARE measurements of ionospheric electric fields are used to obtain Pc 5 polarization maps covering all the STARE field of view. These fields are deduced from electron Hall drift velocities measured with high spatial (20 × 20 km²) and temporal (20 s or 60 s) resolution over a large area (160,000 km²). The fast Fourier transform algorithm is applied to time series of both the north‐south and east‐west electric field components for each of the ∼400 geographic points within the STARE field of view. By retaining both the amplitudes of and relative phase between the north‐south and east‐west Fourier transformed components, the complete polarization state of the Pc 5 electric field can be determined at each geographic point and for each of the discrete frequencies obtained from the fast Fourier transform algorithm. The analysis of a number of selected events that support the hydromagnetic field line resonance theory of micropulsations is presented.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
