HF radio wave acceleration of ionospheric electrons : Analysis of HF-induced optical enhancements
Gustavsson, Björn and Eliasson, Bengt (2008) HF radio wave acceleration of ionospheric electrons : Analysis of HF-induced optical enhancements. Journal of Geophysical Research: Space Physics, 113 (A8). A08319. (https://doi.org/10.1029/2007JA012913)
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The shape of the HF-pump modified electron energy distribution has long been a central question in the field of ionospheric high-frequency radio wave modification experiments. Here we present estimates of the enhanced differential electron flux, from 1.9 to 100 eV based on optical multiwavelength (6300, 5577, 8446, and 4278 Å) data and 930 MHz incoherent scatter radar measurements of ion temperature, electron temperature and concentration. According to our estimate, the electron energy distribution is depleted in the energy range of 2 to approximately 4 eV, probably caused by electron excitation of vibrational states in N2. At the higher energies the electron energy distribution has a nonthermal tail. Further we show that the altitude variations of the four optical emissions should differ both in altitude coverage and center altitude.
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Item type: Article ID code: 45264 Dates: DateEvent28 August 2008PublishedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 18 Oct 2013 14:26 Last modified: 08 Apr 2024 20:50 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/45264