Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 897, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab9d7a
Keywords
Solar flares; Solar activity; Solar active region magnetic fields; Sunspots; Solar active regions; Space weather
Categories
Funding
- Science and Technology Facilities Council (STFC
- UK, Aberystwyth University) [ST/S000518/1]
- SOLARNET Mobility Programme [824135]
- STFC (UK) [ST/M000826/1]
- EU H2020 (SOLARNET) [158538]
- Chinese Academy of Sciences President's International Fellowship Initiative (PIFI) [2019VMA0052]
- Royal Society [IE161153]
- Italian MIUR-PRIN grant [2017APKP7T]
- European Union 's Horizon 2020 research and innovation program [824135, 739500]
- Italian MIUR-PRIN 2017 on Space Weather: impact on circumterrestrial environment of solar activity
- Space Weather Italian COmmunity (SWICO) Research Program
- Universita degli Studi di Catania (Piano per la Ricerca Universita di Catania 2016-2018-Linea di intervento 1 Chance)
- Universita degli Studi di Catania (Linea di intervento 2 Ricerca di Ateneo-Piano per la Ricerca 2016/2018)
- Universita degli Studi di Catania (Fondi di ateneo 2020-2022, Universita di Catania, linea Open Access)
- STFC [ST/S000518/1] Funding Source: UKRI
Ask authors/readers for more resources
The evolution of magnetic helicity has a close relationship with solar eruptions and is of interest as a predictive diagnostic. In this case study, we analyze the evolution of the normalized emergence, shearing, and total magnetic helicity components in the case of three flaring and three non-flaring active regions (ARs) using Spaceweather Helioseismic Magnetic Imager Active Region Patches vector magnetic field data. The evolution of the three magnetic helicity components is analyzed with wavelet transforms, revealing significant common periodicities of the normalized emergence, shearing, and total helicity fluxes before flares in the flaring ARs. The three non-flaring ARs do not show such common periodic behavior. This case study suggests that the presence of significant periodicities in the power spectrum of magnetic helicity components could serve as a valuable precursor for flares.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available