Preprints
https://doi.org/10.5194/angeo-2022-11
https://doi.org/10.5194/angeo-2022-11
 
21 Mar 2022
21 Mar 2022
Status: this preprint is currently under review for the journal ANGEO.

A technique for volumetric incoherent scatter radar analysis

Johann Stamm, Juha Vierinen, Björn Gustavsson, and Andres Spicher Johann Stamm et al.
  • Institute for physics and technology, University of Tromsø, Tromsø, Norway

Abstract. Volumetric measurements of the ionosphere are important for investigating spatial variations of ionospheric features, like auroral arcs and energy deposition in the ionosphere. In addition, such measurements make it possible to distinguish between variations in space and time. While spatial variations in scalar quantities such as electron density or temperature have been investigated with ISR before, spatial variation in the ion velocity, which is a vector quantity, has been hard to measure. The upcoming EISCAT3D radar will be able to do volumetric measurements of ion velocity regularly for the first time. In this article, we present a technique for relating volumetric measurements of ion velocity to neutral wind and electric field. To regularize the estimates, we use Maxwell's equations and fluid-dynamic constraints. The study shows that accurate volumetric estimates of electric field can be achieved. Electric fields can be resolved at altitudes above 120 km which is the altitude range where auroral current closure occurs. Neutral wind can be resolved at altitudes below 120 km.

Johann Stamm et al.

Status: open (extended)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2022-11', Anonymous Referee #1, 03 May 2022 reply
    • AC1: 'Reply on RC1', Johann Stamm, 30 May 2022 reply

Johann Stamm et al.

Johann Stamm et al.

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Short summary
The study of some ionospheric events benefit from the knowledge of how the physics varies over a volume and over time. Examples are studies of aurora or energy deposition. With EISCAT3D, measurements of ion velocity vectors in a volume will be possible for the first time. We present a technique that uses a set of such measurements to estimate electric field and neutral wind. The technique relies on adding restrictions to the estimates. We successfully consider restrictions based upon physics.