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Solar Flare 1/f Fluctuations from Amplitude-Modulated Five-Minute Oscillation
Masahiro Morikawa1, Akika Nakamichi2
1Department of Physics, Ochanomizu University, 2-1-1 Otsuka, Bunkyo, Tokyo 112-8610, Japan.
Entropy (Basel, Switzerland)
|December 23, 2023
Summary
Solar flares exhibit 1/f fluctuations, or pink noise, linked to low-energy events. This pink noise may originate from solar five-minute oscillations modulated by magnetic reconnection, similar to earthquakes and black hole activity.
Area of Science:
- Solar Physics
- Astrophysics
- Geophysics
Background:
- Solar flares exhibit complex temporal dynamics.
- 1/f fluctuations, or pink noise, are common in natural phenomena.
- Previous studies have not fully characterized the spectral properties of solar flare timing sequences.
Purpose of the Study:
- To analyze the power spectral density of solar flare time sequences.
- To investigate the origin of observed 1/f fluctuations in solar flares.
- To explore potential parallels between solar flares and other natural phenomena exhibiting 1/f fluctuations.
Main Methods:
- Analysis of GOES16 solar flare data.
- Calculation of power spectral density for flare timing sequences.
- Investigation of solar five-minute oscillations (SFO) and magnetic reconnection processes.
Main Results:
- Solar flares exhibit 1/f fluctuations, particularly low-energy events.
- High-energy flares show a flat spectrum, distinct from low-energy ones.
- A hypothesis linking 1/f fluctuations to amplitude modulation by SFO and demodulation by magnetic reconnection is proposed and partially supported.
Conclusions:
- Solar flare 1/f fluctuations are associated with low-energy phenomena and potentially linked to SFO and magnetic reconnection.
- The 1/f fluctuation analysis framework can be extended to earthquakes and black hole/disk systems.
- This research provides a novel perspective on the underlying physics of solar flares and their connections to other complex systems.
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