Search Publications
Intensification of magnetic field in merging magnetic flux tubes driven by supergranular vortical flows
Chian, Abraham C. -L.; Silva, Suzana S. A.; Rempel, Erico L. +2 more
The spatiotemporal dynamics of vorticity and magnetic field in the region of a photospheric vortex at a supergranular junction of the quiet Sun is studied, using Hinode's continuum intensity images and longitudinal magnetograms. We show that in a 30-min interval during the vortex lifetime, the magnetic field is intensified at the centres of two me…
The role of cooling induced by mixing in the mass and energy cycles of the solar atmosphere
Hillier, Andrew; Snow, Ben; Arregui, Iñigo
In many astrophysical systems, mixing between cool and hot temperature gas/plasma through Kelvin-Helmholtz-instability-driven turbulence leads to the formation of an intermediate temperature phase with increased radiative losses that drive efficient cooling. The solar atmosphere is a potential site for this process to occur with interaction betwee…
Solar coronal magnetic field measurements using spectral lines available in Hinode/EIS observations: strong and weak field techniques and temperature diagnostics
Chen, Yajie; Tian, Hui; Bai, Xianyong +4 more
Recently, it has been proposed that the magnetic-field-induced transition (MIT) in Fe X can be used to measure coronal magnetic field strengths. Several techniques, the direct line ratio technique and the weak and strong magnetic field techniques, are developed to apply the MIT theory to spectroscopic observations taken by EUV Imaging Spectrometer…
Formation and thermodynamic evolution of plasmoids in active region jets
Del Zanna, Giulio; Mulay, Sargam M.; Tripathi, Durgesh +2 more
We have carried out a comprehensive study of the temperature structure of plasmoids, which successively occurred in recurrent active region jets. The multithermal plasmoids were seen to be travelling along the multithreaded spire as well as at the footpoint region in the EUV/UV images recorded by the Atmospheric Imaging Assembly (AIA). The differe…
A statistical study of trans-equatorial loops from 2006 to 2020
Pevtsov, Alexei A.; Xue, Zhike; Su, Jiangtao +5 more
We studied trans-equatorial loops (TLs) statistically from December 2006 to 2020. During this period, 160 TLs were identified, and 12 per cent of all active regions are connected by TLs. The result shows that 74 per cent of TLs are connected to regions of preceding magnetic polarity (PTLs), and only 26 per cent of TLs are connected to regions of f…
Variation of temperature and non-thermal velocity with height in fan loops
Tripathi, Durgesh; Sharma, Aishawnnya
We study the variation of temperature and non-thermal velocity with height in fan loops. For this purpose, we have used the observations recorded by the Extreme Ultraviolet Imaging Spectrometer onboard Hinode. We have employed the emission measure (EM)-loci method to estimate the temperatures of different coronal fan loops and then compute the non…