Abstract
Time series of photospheric magnetic parameters of solar active regions (ARs) are used to answer the question whether scaling properties of fluctuations embedded in such time series help to distinguish between flare-quiet and flaring ARs. We examine a total of 118 flare-quiet and 118 flaring AR patches, Helioseismic and Magnetic Imager Active Region Patches (called HARPs), which were observed from 2010 to 2016 by the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO). Specifically, the scaling exponent of fluctuations is derived applying the Detrended Fluctuation Analysis (DFA) method to a dataset of 8-day time series of 18 photospheric magnetic parameters at 12-min cadence for all HARPs under investigation. We first find a statistically significant difference in the distribution of the scaling exponent between the flare-quiet and flaring HARPs, in particular for some space-averaged, signed parameters associated with magnetic field line twist, electric current density, and current helicity. The flaring HARPs tend to show higher values of the scaling exponent compared to those of the flare-quiet ones, even though there is considerable overlap between their distributions. In addition, for both the flare-quiet and the flaring HARPs the DFA analysis indicates that i) time series of most of various magnetic parameters under consideration are non-stationary, and ii) time series of the total unsigned magnetic flux and the mean photospheric magnetic free energy density in general present a non-stationary, persistent property, while the total unsigned flux near magnetic polarity inversion lines and parameters related to current density show a non-stationary, anti-persistent trend in their time series.
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Acknowledgements
The authors would like to thank an anonymous referee for valuable comments and suggestions. This work was supported by the BK21 plus program through the National Research Foundation (NRF) funded by the Ministry of Education of Korea, the Basic Science Research Program through the NRF funded by the Ministry of Education (NRF-2019R1A2C1002634), the Korea Astronomy and Space Science Institute (KASI) under the R&D program “Study on the Determination of Coronal Physical Quantities using Solar Multi-wavelength Images” (project No. 2019-1-850-02) supervised by the Ministry of Science and ICT, and Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIP) (2018-0-01422, Study on analysis and prediction technique of solar flares). The data used in this work are courtesy of the NASA/SDO and HMI science team. This research has made use of NASA’s Astrophysics Data System (ADS). S.-H.P. acknowledges support from the Institute for Space-Earth Environmental Research (ISEE) of Nagoya University as well as MEXT/JSPS KAKENHI Grant Number JP15H05814, Project for Solar-Terrestrial Environment Prediction (PSTEP).
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Lee, EJ., Park, SH. & Moon, YJ. Time Series Analysis of Photospheric Magnetic Parameters of Flare-Quiet Versus Flaring Active Regions: Scaling Properties of Fluctuations. Sol Phys 295, 123 (2020). https://doi.org/10.1007/s11207-020-01690-4
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DOI: https://doi.org/10.1007/s11207-020-01690-4