Estimation of solar wind density fluctuations using interplanetary radio emissions

0474136 - ÚFA 2018 FR eng A - Abstract
Krupař, Vratislav
Estimation of solar wind density fluctuations using interplanetary radio emissions.
7th Solar Orbiter Workshop: Abstract booklet. Paris: European Space Agency (ESA), 2017. s. 104.
[Solar Orbiter Workshop /7./: Exploring the solar environs. 03.04.2017-07.04.2017, Granada]
Institutional support: RVO:68378289
Keywords : solar radio emissions * interplanetary radio emissions
Subject RIV: BL - Plasma and Gas Discharge Physics
http://spg.iaa.es/solo2017/abstractbooklet_final.pdf

Type III bursts are generated by beams of fast electrons originated from reconnection sites
of solar flares. These beams propagate outwards from the Sun along open magnetic field
lines while exciting radio emission at the local plasma frequency fp and/or its second
harmonic 2fp. While radio emissions travel through the interplanetary (IP) medium,
scattering by the random density fluctuations distort properties of the IP type III radio
bursts observed at 1 au, that results in apparently shifted and extended radio sources. IP
radio emissions can be thus used for remote estimation of relative electron density
fluctuations in the solar wind. We performed a statistical survey of 152
simple and isolated IP type III bursts observed by STEREO/Waves instruments between
May 2007 and February 2013. We investigated their time-frequency profiles to derive
decay times as a function of frequency. We also performed Monte Carlo simulations to
study a role of scattering due to random density fluctuations on time-frequency profiles of
radio emissions generated in the IP medium.
Permanent Link: http://hdl.handle.net/11104/0271247