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- W3097978104 abstract "We report the observation of the first two harmonics of the horizontally polarized kink waves excited in a coronal loop system lying at south-east of AR 11719 on 2013 April 11. The detected periods of the fundamental mode ($P_1$), its first overtone ($P_2$) in the northern half, and that in the southern one are $530.2 pm 13.3$, $300.4 pm 27.7$, and $334.7 pm 22.1$ s, respectively. The periods of the first overtone in the two halves are the same considering uncertainties in the measurement. We estimate the average electron density, temperature, and length of the loop system as $(5.1 pm 0.8) times 10^8$ cm$^{-3}$, $0.65 pm 0.06$ MK, and $203.8 pm 13.8$ Mm, respectively. As a zeroth order estimation, the magnetic field strength, $B = 8.2 pm 1.0$ G, derived by the coronal seismology using the fundamental kink mode matches with that derived by a potential field model. The extrapolation model also shows the asymmetric and nonuniform distribution of the magnetic field along the coronal loop. Using the amplitude profile distributions of both the fundamental mode and its first overtone, we observe that the antinode positions of both the fundamental mode and its first overtone shift towards the weak field region along the coronal loop. The results indicate that the density stratification and the temperature difference effects are larger than the magnetic field variation effect on the period ratio. On the other hand, the magnetic field variation has a greater effect on the eigenfunction of the first overtone than the density stratification does for this case." @default.
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- W3097978104 date "2015-01-23" @default.
- W3097978104 modified "2023-10-12" @default.
- W3097978104 title "MAGNETOHYDRODYNAMIC SEISMOLOGY OF A CORONAL LOOP SYSTEM BY THE FIRST TWO MODES OF STANDING KINK WAVES" @default.
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- W3097978104 doi "https://doi.org/10.1088/0004-637x/799/2/151" @default.
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