Abstract
We review new physical results about various types of ULF waves (Pc3, Pi1-2, Pc1-2) in the topside ionosphere stemming from low-orbiting satellite observations. Pc3 and Pi2 waves were detected clearly in the compressional component, whereas on the ground their signature was found in the H component. Relationships between the ULF wave compressional component above the ionosphere and the ground response can be produced by different wave energy transfer mechanisms. Theoretical modeling showed that Pc 3 waves and nighttime Pi2 pulsations observed simultaneously in the upper ionosphere and on the ground corresponded to the scenario of direct fast mode transmission to the ground. The transverse waves dominated only in narrow regions of field line Alfven resonance. Pc1 and Pc2 waves were found to be confined to subauroral and sub-plasmapause latitudes, respectively. The overwhelming fast magnetosonic waves in the near-planet environment could be used as sounding signals for the magnetotelluric sounding of the conductivity of a planet based on the recordings of electric and magnetic components on a low-orbiting probe. The LEO observations make it possible to study ULF response of the upper ionosphere to atmospheric thunderstorm activity.
Sign-in/Register to access full text options 
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.
