Research Information System
BOSTANCI GÜVER Z. F. (Executive), GÜVER T.
TUBITAK Project, 1001 - Program for Supporting Scientific and Technological Research Projects, 2017 - 2021
Solar flares are the strongest magnetic events in the solar system and responsible for the coronal plasma to be heated and accelerated to relativistic energies. It is believed that flares originate from the enormous amount of energy stored in the magnetic fields related to the active regions around sunspots. Today, it is accepted that magnetic field is the main energy resource for solar flares in addition to a number of other solar activity. The radiation after a flare is emitted in a broad range in electromagnetic spectrum: radio, optical, UV, X-rays and gamma-rays.
For over 40 years it has been reported from observations across the electromagnetic spectrum; from radio to gamma-rays, that flares show quasi-periodic oscillations (QPP; quasi-periodic pulsations). Based on studies of frequency analysis of time series, the QPP periodicities in flares may be as short as sub-second to tens of seconds or even up to 5 minutes. QPP can be detected from pre-flare to post-flare stage where the decay happens.
Despite the many studies on the QPPs still it is uncertain what mechanisms really cause them and generally MHD processes are thought to be related. There are several reasons for the motivation to study QPP in flares. First of all, QPPs are an intrinsic property of flares and responsible for the energy release. In addition, QPPs in solar flares have important information in our understanding of the processes within the solar flares and their triggering mechanism.
For these reasons, within this project, through the use of a large sample signals of QPPs observed from solar flares will the analyzed systematically. Within the project both GOES (Geostationary Operational Environmental Satellite) satellite data sets and Fermi/GBM (Gamma-ray Burst Monitor) satellite will be used to perform spectral and timing analysis the M- and X-type solar flares and dynamic and spectral properties of QPPs will be investigated. Using the findings some of the annuities of the QPP characteristics in the literature will be understood and the possible mechanisms behind the QPP will be discussed.