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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Shock wave driven by CME evidenced by metric type II burst and EUV wave

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Cunha-Silva, R. D. [1] ; Fernandes, F. C. R. [1] ; Selhorst, C. L. [1]
Total Authors: 3
[1] Univ Vale Paraiba, UNIVAP, IP&D, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Advances in Space Research; v. 56, n. 12, p. 2804-2810, DEC 15 2015.
Web of Science Citations: 1

Solar type II radio bursts are produced by plasma oscillations in the solar corona as a result of shock waves. The relationship between type II bursts and coronal shocks is well evidenced by observations since the 1960s. However, the drivers of the shocks associated with type II events at metric wavelengths remain as a controversial issue among solar physicists. The flares and the coronal mass ejections (CMEs) are considered as potential drivers of these shocks. In this article, we present an analysis of a metric type II burst observed on May 17, 2013, using data provided by spectrometers from e-CALLISTO (extended-Compound Astronomical Low-cost Low-frequency Instrument for Spectroscopy and Transportable Observatories) and BUY images from the Extreme Ultraviolet Imager (EUVI), aboard the Solar Terrestrial Relations Observatory (STEREO). The event was associated with an M3.2 SXR flare and a halo CME. The EUV wave produced by the expansion of the CME was clear from the BUY images. The heights of the EUV wave fronts proved to be consistent with the heights of the radio source obtained with the 2-4 x Newkirk density model, which provided a clue to an oblique propagation of the type-II-emitting shock segment. The results for the magnetic field in the regions of the shock also revealed to be consistent with the heights of the radio source obtained using the 2-4 x Newkirk density model. Exponential fit on the intensity maxima of the harmonic emission provided a shock speed of similar to 580-990 km s(-1), consistent with the average speed of the associated BUY wave front of 626 km s-1. (C) 2015 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 14/10489-0 - Study of the changes in the solar magnetic field based on radio observations
Grantee:Caius Lucius Selhorst
Support type: Regular Research Grants
FAPESP's process: 12/00009-5 - Diagnosis of solar emissions in meter and decimeter wavelengths associated with coronal mass ejection (CME) and solar flares
Grantee:Rafael Douglas Cunha da Silva
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 12/08445-9 - Study of day-to-day variability of the mesosphere, thermosphere and ionosphere at low latitude and equatorial region, during the solar cycle 24
Grantee:Paulo Roberto Fagundes
Support type: Research Projects - Thematic Grants