Active regions and coronal loops
Solar active regions: SOHO/CDS and TRACE observations of quiescent coronal loops
... solar active regions. In particular we concentrate on the 1 MK loops, best seen in the TRACE EUV 173 Å ...-limb active region 1 MK loops performed with TRACE (173 Å and 195 Å bands) and ...
15
Diagnostics of coronal heating in active region loops
... Understanding coronal heating remains a central problem in solar ...individual coronal loops in solar active regions can provide constraints on the volumetric heating function, and to ...
15
Eclipse observations of high frequency oscillations in active region coronal loops
... solar active regions is the damping of magnetohydro- dynamic (MHD) ...in coronal loops observed during the August 1999 total solar ...temperature loops associated with the active ...
6
Simulations of solar jets confined by coronal loops.
... field—tracing loops in magnetically closed active regions and quasi-radial spires in magnetically open coronal holes —and is subjected to nonthermal, presumably magnetic, ...
18
3-D numerical simulations of coronal loops oscillations
... 3-D active regions (AR’s) on the excitation and the damping of slow standing ...curved loops than in 2-D curved arcades and that slow waves can be excited within an interval of time that is ...
10
Excitation of kink oscillations of coronal loops : statistical study
... As a byproduct of our analysis it was found that almost all the studied kink oscillation events were associated with both flares and LCEs, which occurred in the same parental active regions. This shows a ...
13
The heating of solar coronal loops by Alfvèn wave turbulence
... of coronal loops by Alfv´ en wave turbulence ...an active-region loop, we investigate how the waves from neighboring flux tubes interact in the chromosphere and ...the coronal field lines are ...
40
The cooling of coronal plasmas IV Catastrophic cooling of loops
... of coronal loops and demonstrate that the recently identified catastrophic cooling is due to the inability of a loop to sustain radiative/enthalpy cooling below a critical temperature, which can be >1 MK in ...
5
Magnetic and thermal structuring and dynamics of solar coronal active regions
... the coronal magnetic field. Magnetic energy builds up in this coronal field until it becomes unstable and erupts, launching the filament out of the corona, and opening the magnetic field lines which were ...
127
Aspects of the relationship between active regions and coronal mass ejections
... f Coronal M ass E jections The 12 CMEs chosen for this survey were selected due to their good coverage in the LASCO C2 and C3 ...coronagraphs. Active regions lying under the span of the CME, as seen ...
163
The redshifted footpoints of coronal loops
... in loops to be impul- sive (Klimchuk, 2006), assuming nano-flare generated chro- mospheric evaporation followed by ...in loops which can stay unchanged for days do not support impulsive models and hint more ...
5
Transverse oscillations of coronal loops
... parallel coronal loops Very often it is observed that not a single loop, but a whole array of loops oscillates after being perturbed by, ...the loops as we see them actually consist of a ...
32
Sausage oscillations of coronal loops
... The standard approach in the theoretical description of sausage modes is based upon modelling of the oscillating loop as a magnetic cylinder or a magnetic slab, confined between two rigid walls corresponding to the ...
7
Dynamics of solar coronal loops
... The right panel of Fig. 4 shows the most complex evo- lution of this set of numerical experiments: as the heating is even more concentrated towards the footpoints, the evolution of temperature along the loop with time ...
12
Slow magnetoacoustic waves in coronal loops
... 5. Conclusions We present here a theoretical model for slow magnetoacous- tic waves propagating along magnetic field lines in coronal loops. The model incorporates the effects of dissipation due to finite ...
7
Transverse oscillations of two parallel coronal loops
... magnetic loops. The loops are modelled by straight magnetic tubes of radii R L and R R ...magnetic loops are frozen in the dense immovable pho- tospheric plasma, which implies that the ends of the ...
10
3D MHD modeling of twisted coronal loops
... a coronal magnetic fl ux tube that is anchored in the chromosphere and progressively twisted by the rotation of the plasma at the ...an active role for the magnetic fi eld, including the expansion of the fi ...
15
Decay less kink oscillations in coronal loops
... We selected 100 slits perpendicular to the fitted loop path. Each slit was three AIA pixels wide and 76 pixels long, which corresponds to almost 32 Mm. To increase the signal-to-noise ratio we calculated an average ...
7
Heating by transverse waves in simulated coronal loops
... oscillating loops (Van Doors- selaere et ...line-tied loops the viscous and resistive heating mechanisms can be observa- tionally distinguished by the site of the ...cillating loops, while viscous ...
10
Transverse kink oscillations of expanding coronal loops
... The raising speed of loops is generally taken to be 10−15 km s −1 (Chou & Zirin 1988; Archontis 2008). Consequently, the time needed for the loop to travel the distance from the TR to its steady position can ...
8