DOI: 10.1029/2018JA025636
Scopus记录号: 2-s2.0-85052606784
论文题名: Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements
作者: Virtanen I.I. ; Gustavsson B. ; Aikio A. ; Kero A. ; Asamura K. ; Ogawa Y.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 8 起始页码: 6865
结束页码: 6887
语种: 英语
英文摘要: Differential energy flux of electrons precipitating into the high-latitude ionosphere can be estimated from incoherent scatter radar observations of the ionospheric electron density profile. We present a method called ELSPEC for electron spectrum estimation from incoherent scatter radar measurements, which is based on integration of the electron continuity equation and spectrum model selection by means of the Akaike information criterion. This approach allows us to use data with almost arbitrary time resolutions, enables spectrum estimation with dense energy grids, avoids noise amplifications in numerical derivatives, and yields statistical error estimates for all the output parameters, including the number and energy fluxes and upward field-aligned currents carried by the precipitating electrons. The technique is targeted for auroral energies, 1–100 keV, which ionize the atmosphere mainly between 80 and 150 km altitudes. We validate the technique by means of a simulation study, which shows that Maxwellian, kappa, and mono-energetic spectra, as well as combinations of those, can be reproduced. Comparison study for two conjugate satellite measurements to the EISCAT UHF radar are shown, for Reimei and Swarm, showing an agreement with the results. Finally, an example of a 2-hr measurement by the EISCAT radar is shown, during which we observe a variety of precipitation characteristics, from soft background precipitation to mono-energetic spectra with peak energies up to 60 keV. The upward field-aligned current varies from 0 to 10 μAm−2 and the total energy flux from 0 to 250 mWm−2. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113356
Appears in Collections: 气候减缓与适应
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作者单位: Ionospheric Physics Research Unit, University of Oulu, Oulu, Finland; UiT – The Arctic University, Tromsø, Norway; Sodankylä Geophysical Observatory, University of Oulu, Sodankylä, Finland; Japan Aerospace Exploration Agency, Japan; National Institute of Polar Research, Tokyo, Japan
Recommended Citation:
Virtanen I.I.,Gustavsson B.,Aikio A.,et al. Electron Energy Spectrum and Auroral Power Estimation From Incoherent Scatter Radar Measurements[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(8)