Winners announced for the Space Weather Competition. Visit http://esws2020.iopconfs.org/winners for details.

Reconstruction of radio-wave auroral absorption during magnetospheric substorm

Maria Shukhtina - Saint-Petersburg State University, Russia; Victor Sergeev - Saint-Petersburg State University,, Russia; Denis Rogov - Arctic and Antarctic Research Institute, St. Petersburg, Russia; Nikita Stepanov - Saint-Petersburg State University, Russia; Xiangning Chu - University of California, United States; Emma Spanswick - University of Calgary,, Canada; Tero Raita - Sodankyla Geophysical Observatory, University of Oulu, Finland

Earth's Magnetosphere and Radiation Belts

Abstract

Energetic Electron precipitation (EEP) is an important magnetospheric substorm manifestation.  EEP produces Cosmic Noise Absorption (CNA), braking radio- wave communication. Thus EEP and CNA modeling is a significant Space Weather problem.

Existing empirical EEP/CNA models are based on daily/hour geomagnetic indices (Ap or AE), not appropriate for substorms.

Our CNA model is based on the mid-latitude positive bay (MPB) index, which is the square of magnetic field horizontal component (H2=X2+Y2) at mid-latitude stations (McPherron&Chu,2017). As one of the main substorm acceleration mechanisms is betatron acceleration, CNA should be proportional to magnitude of dipolarization at the magnetospheric equator, which was shown to be proportional to mid-latitude H variation.

We use the linear prediction filter (LPF) technique connecting the current CNA value with MPB values during 4 preceding hours. The array of increments of square root of MPB index is the input, Canadian riometer data serving as output.  LPFs are constructed with 5-min resolution for the center of the auroral zone (65-75CGL) for all MLT sectors.  The obtained response functions permit to calculate the CNA variation for substorms of arbitrary form and duration. The method was tested on a long disturbed interval and on independent Scandinavian riometer data with satisfactory result.


Approaching deadlines:

Registration opens:

16 July 2020

Abstract submission opens:

16 July 2020

European Space Weather Medals:

6 September 2020

Registration deadline:

25 September 2020

Registration deadline: [extended]

10 October 2020

Abstract submission deadline:

4 September 2020