Statistical survey of type III radio bursts at long wavelengths observed by the Solar TErrestrial RElations Observatory (STEREO)/Waves instruments: goniopolarimetric properties and radio source locations

0433805 - ÚFA 2015 RIV NL eng J - Journal Article
Krupař, Vratislav - Maksimovic, M. - Santolík, Ondřej - Cecconi, B. - Krupařová, Oksana
Statistical survey of type III radio bursts at long wavelengths observed by the Solar TErrestrial RElations Observatory (STEREO)/Waves instruments: goniopolarimetric properties and radio source locations.
Solar Physics. Roč. 289, č. 12 (2014), s. 4633-4652. ISSN 0038-0938. E-ISSN 1573-093X
R&D Projects: GA ČR GP13-37174P; GA ČR GAP205/10/2279; GA ČR(CZ) GAP209/12/2394
Institutional support: RVO:68378289
Keywords : plasma radiation * solar radio emissions
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 4.039, year: 2014
http://link.springer.com/article/10.1007%2Fs11207-014-0601-z

We have performed a statistical analysis of a large number of Type III radio bursts observed by STEREO between May 2007 and February 2013. Only intense, simple, and isolated cases have been included in our data set. We focused on the goniopolarimetric (GP, also referred to as direction-finding) properties at frequencies between 125 kHz and 2 MHz. The apparent source size γ is very extended (≈60◦) for the lowest analyzed frequencies. Observed apparent source sizes γ expand linearly with a radial distance from the Sun at frequencies below 1 MHz. We show that Type III radio bursts statistically propagate in the ecliptic plane. The calculated positions of radio sources indicate that scattering of the primary beam pattern plays an important role in the propagation of Type III radio bursts in the interplanetary medium.
Permanent Link: http://hdl.handle.net/11104/0237969