# Sources of Quasi-periodic Pulses in the Flare of 18 August 2012

@article{Altyntsev2016SourcesOQ,
title={Sources of Quasi-periodic Pulses in the Flare of 18 August 2012},
author={A. Altyntsev and N. Meshalkina and H. M{\'e}sz{\'a}rosov{\'a} and M. Karlický and V. Palshin and S. Lesovoi},
journal={Solar Physics},
year={2016},
volume={291},
pages={445-463}
}
We analyzed spatial and spectral characteristics of quasi-periodic pulses (QPP) for the limb flare on 18 August 2012, using new data from a complex of spectral and imaging instruments developed by the Siberian Solar Radio Telescope team and the Wind/Konusγ$\gamma$-ray spectrometer. A sequence of broadband pulses with periods of approximately ten seconds were observed in X-rays at energies between 25 keV and 300 keV, and in microwaves at frequencies from a few GHz up to 34 GHz during an interval… Expand

#### Figures and Tables from this paper

Flare SOL2012-07-06: On the Origin of the Circular Polarization Reversal Between 17 GHz and 34 GHz
• Physics
• 2017
The new generation of multiwavelength radioheliographs with high spatial resolution will employ microwave imaging spectropolarimetry to recover flare topology and plasma parameters in the flareExpand
Regular observations of active processes in the solar atmosphere have been started using the first stage of the multiwave Siberian Radioheliograph (SRH), a T-shaped 48-antenna array with a 4-8 GHzExpand
Regular observations of active processes in the solar atmosphere have been started using the first stage of the multiwave Siberian Radioheliograph (SRH), a T-shaped 48-antenna array with a 4-8 GHzExpand
Rapid Variability in the SOL2011-08-04 Flare: Implications for Electron Acceleration
• Physics
• 2019
Particle acceleration in solar flares remains an outstanding problem in solar physics. It is yet unclear which of the acceleration mechanisms dominates and how exactly is the excessive magneticExpand
The 26 December 2001 Solar Event Responsible for GLE63. I. Observations of a Major Long-Duration Flare with the Siberian Solar Radio Telescope
• Physics
• 2016
Ground level enhancements (GLEs) of cosmic-ray intensity occur, on average, once a year. Because they are rare, studying the solar sources of GLEs is especially important to approach understandingExpand

#### References

SHOWING 1-10 OF 50 REFERENCES
Quasi-periodic Pulsations in a Solar Microwave Burst
• Physics
• 2003
Quasi-periodic pulsations in solar flares can provide important information on physical conditions in flaring regions. In this paper, we study a microwave burst that showed deep quasi-periodicExpand
Periodic Acceleration of Electrons in the 1998 November 10 Solar Flare
We present an examination of the multiwavelength observation of a C7.9 flare that occurred on 1998 November 10. This is the first imaging observation of the quasi-periodic pulsations (QPPs). FourExpand
High-Energy Emission from a Solar Flare in Hard X-rays and Microwaves
• Physics
• 2009
We investigate accelerated electron energy spectra for different sources in a large flare using simultaneous observations obtained with two instruments, the Nobeyama Radio Heliograph (NoRH) at 17 andExpand
On the Microwave Spike Emission of the September 6, 1992 Flare
• Physics
• 1998
The main aim of this paper is to estimate, from multispectral observations, the plasma parameters in a microwave burst source which was also the site of spike emission. This information is essentialExpand
Flat microwave spectra seen at X-class flares
• Physics
• 1994
We report peculiar spectral activity of four large microwave bursts as obtained from the Solar Arrays at the Owens Valley Radio Observatory during observations of X-class flares on 1990 May 24 andExpand
HARD X-RAY AND ULTRAVIOLET EMISSION DURING THE 2011 JUNE 7 SOLAR FLARE
• Physics
• 2013
The relationship between X-ray and UV emission during flares, particularly in the context of quasi-periodic pulsations, remains unclear. To address this, we study the impulsive X-ray and UV emissionExpand
Radio Pulsating Structures with Coronal Loop Contraction
• Physics
• 2012
We present a multi-wavelength study of a solar eruption event on 20 July 2004, comprising observations in Hα, EUV, soft X-rays, and in radio waves with a wide frequency range. The analyzed data showExpand
Energetic electrons in impulsive and extended solar flares as deduced from flux correlations between hard X-rays and microwaves
• Physics
• 1988
The peak flux relationship between hard X-rays and microwaves from solar flares is studied using about 400 events simultaneously recorded with the hard X-ray burst spectrometer on the SMM satelliteExpand
Magnetic Field Configuration in Impulsive Solar Flares Inferred from Coaligned Microwave/X-Ray Images
• Physics
• 1997
The results of an analysis of 14 impulsive solar flares, observed simultaneously with microwave and X-ray imaging instruments, are presented. From the relative locations of microwave, hard X-ray, andExpand
Thermal to Nonthermal Energy Partition at the Early Rise Phase of Solar Flares
• Physics
• 2012
In some flares the thermal component appears much earlier than the nonthermal component in X-ray range. Using sensitive microwave observations we revisit this finding made by Battaglia et al. (2009)Expand