Simulation study of the interaction between large-amplitude HF radio waves and the ionosphere
2007 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 34, no 6, L06106- p.Article in journal (Refereed) Published
The time evolution of a large-amplitude electromagnetic (EM) wave injected vertically into the overhead ionosphere is studied numerically. The EM wave has a carrier frequency of 5 MHz and is modulated as a Gaussian pulse with a width of approximately 0.1 milliseconds and a vacuum amplitude of 1.5 V/m at 50 km. This is a fair representation of a modulated radio wave transmitted from a typical high-power HF broadcast station on the ground. The pulse is propagated through the neutral atmosphere to the critical points of the ionosphere, where the L-O and R-X modes are reflected, and back to the neutral atmosphere. We observe mode conversion of the L-O mode to electrostatic waves, as well as harmonic generation at the turning points of both the R-X and L-O modes, where their amplitudes rise to several times the original ones. The study has relevance for ionospheric interaction experiments in combination with ground-based and satellite or rocket observations.
Place, publisher, year, edition, pages
2007. Vol. 34, no 6, L06106- p.
IdentifiersURN: urn:nbn:se:uu:diva-150908DOI: 10.1029/2006GL028948ISI: 000245552700005OAI: oai:DiVA.org:uu-150908DiVA: diva2:409352