A1 Journal article (refereed), original research

Bayesian filtering in incoherent scatter plasma parameter fits


Open Access publication

Publication Details
Authors: Virtanen Ilkka I., Tesfaw Habtamu W., Roininen Lassi, Lasanen Sari, Aikio Anita
Publisher: American Geophysical Union (AGU)
Publication year: 2021
Language: English
Related journal or series: Journal of Geophysical Research: Space Physics
Volume number: 126
Issue number: 3
ISSN: 2169-9380
eISSN: 2169-9402
JUFO level of this publication: 2
Open Access: Open Access publication

Abstract

Incoherent scatter (IS) radars are invaluable instruments for ionospheric physics, since they observe altitude profiles of electron density (Ne), electron temperature (Te), ion temperature (Ti) and line‐of‐sight plasma velocity (Vi) from ground. However, the temperatures can be fitted to the observed IS spectra only when the ion composition is known, and resolutions of the fitted plasma parameters are often insufficient for auroral electron precipitation, which requires high resolutions in both range and time. The problem of unknown ion composition has been addressed by means of the full‐profile analysis, which assumes that the plasma parameter profiles are smooth in altitude, or follow some predefined shape. In a similar manner, one could assume smooth time variations, but this option has not been used in IS analysis. We propose a plasma parameter fit technique based on Bayesian filtering, which we have implemented as an additional Bayesian Filtering Module (BAFIM) in the GUISDAP analysis package. BAFIM allows us to control gradients in both time and range directions for each plasma parameter separately. With BAFIM we can fit F1 region ion composition together with Ne, Te, Ti and Vi, and we have reached 4 s/900 m time/range steps in four‐parameter fits of Ne, Te, Ti and Vi in E region observations of auroral electron precipitation.


Last updated on 2021-08-04 at 07:38

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