High-resolution photography of the solar chromosphere. XIX - Flow velocities along an active region loop

1984 ◽  
Vol 283 ◽  
pp. 392 ◽  
Author(s):  
R. E. Loughhead ◽  
R. J. Bray
Keyword(s):  
High Resolution ◽  
Active Region ◽  
Solar Chromosphere ◽  
Region Loop ◽  
Flow Velocities

High-resolution photography of the solar chromosphere. XXI Determination of the physical conditions in an H-alpha active-region loop

1985 ◽  
Vol 294 ◽  
pp. 697 ◽  
Author(s):  
R. E. Loughhead ◽  
R. J. Bray ◽  
J.-L. Wang
Keyword(s):  
High Resolution ◽  
Active Region ◽  
Solar Chromosphere ◽  
Physical Conditions ◽  
Region Loop

scholarly journals High-resolution millimeter-interferometer observations of the solar chromosphere

2006 ◽  
Vol 456 (2) ◽  
pp. 697-711 ◽  
Author(s):  
S. M. White ◽  
M. Loukitcheva ◽  
S. K. Solanki
Keyword(s):  
High Resolution ◽  
Solar Chromosphere

High-resolution photography of the solar chromosphere

Solar Physics ◽  
1968 ◽  
Vol 5 (3) ◽  
pp. 323-328 ◽  
Author(s):  
R. J. Bray
Keyword(s):  
High Resolution ◽  
Solar Chromosphere

The magnetic structure and dynamics of a decaying active region

2019 ◽  
Vol 15 (S354) ◽  
pp. 53-57
Author(s):  
Ioannis Kontogiannis ◽  
Christoph Kuckein ◽  
Sergio Javier González Manrique ◽  
Tobias Felipe ◽  
Meetu Verma ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Time Series ◽  
High Resolution ◽  
Active Region ◽  
Magnetic Structure ◽  
High Velocity ◽  
Solar Dynamics Observatory ◽  
Multi Wavelength ◽  
Convective Motions ◽  
Field Lines

AbstractWe study the evolution of the decaying active region NOAA 12708, from the photosphere up to the corona using high resolution, multi-wavelength GREGOR observations taken on May 9, 2018. We utilize spectropolarimetric scans of the 10830 Å spectral range by the GREGOR Infrared Spectrograph (GRIS), spectral imaging time-series in the Na ID2 spectral line by the GREGOR Fabry-Pérot Interferometer (GFPI) and context imaging in the Ca IIH and blue continuum by the High-resolution Fast Imager (HiFI). Context imaging in the UV/EUV from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) complements our dataset. The region under study contains one pore with a light-bridge, a few micro-pores and extended clusters of magnetic bright points. We study the magnetic structure from the photosphere up to the upper chromosphere through the spectropolarimetric observations in He II and Si I and through the magnetograms provided by the Helioseismic and Magnetic Imager (HMI). The high-resolution photospheric images reveal the complex interaction between granular-scale convective motions and a range of scales of magnetic field concentrations in unprecedented detail. The pore itself shows a strong interaction with the convective motions, which eventually leads to its decay, while, under the influence of the photospheric flow field, micro-pores appear and disappear. Compressible waves are generated, which are guided towards the upper atmosphere along the magnetic field lines of the various magnetic structures within the field-of-view. Modelling of the He i absorption profiles reveals high velocity components, mostly associated with magnetic bright points at the periphery of the active region, many of which correspond to asymmetric Si I Stokes-V profiles revealing a coupling between upper photospheric and upper chromospheric dynamics. Time-series of Na ID2 spectral images reveal episodic high velocity components at the same locations. State-of-the-art multi-wavelength GREGOR observations allow us to track and understand the mechanisms at work during the decay phase of the active region.

New View of the Solar Chromosphere

2019 ◽  
Vol 57 (1) ◽  
pp. 189-226 ◽  
Author(s):  
Mats Carlsson ◽  
Bart De Pontieu ◽  
Viggo H. Hansteen
Keyword(s):  
High Resolution ◽  
Adaptive Optics ◽  
Numerical Models ◽  
Transverse Magnetic ◽  
Solar Photosphere ◽  
Solar Chromosphere ◽  
Image Reconstruction Techniques ◽  
New Instrumentation ◽  
Field Unit ◽  
The Impact

The solar chromosphere forms a crucial, yet complex and until recently poorly understood, interface between the solar photosphere and the heliosphere. ▪ Advances in high-resolution instrumentation, adaptive optics, image reconstruction techniques, and space-based observatories allow unprecedented high-resolution views of the finely structured and highly dynamic chromosphere. ▪ Dramatic progress in numerical computations allows 3D radiative magnetohydrodynamic forward models to take the place of the previous generation of 1D semiempirical atmosphere models. These new models provide deep insight into complex nonlocal thermodynamic equilibrium chromospheric diagnostics and enable physics-based interpretations of observations. ▪ This combination of modeling and observations has led to new insights into the role of shock waves, transverse magnetic waves, magnetic reconnection and flux emergence in the chromospheric energy balance, the formation of spicules, the impact of ion-neutral interactions, and the connectivity between chromosphere and transition region. ▪ During the next few years, the advent of new instrumentation (integral-field-unit spectropolarimetry) and observatories (ALMA, DKIST), coupled with novel inversion codes and expansion of existing numerical models to deal with ever more complex physical processes (including multifluid approaches), is expected to lead to major new insights into the dominant heating processes in the chromosphere and beyond.

Observation and Modeling of High-temperature Solar Active Region Emission during the High-resolution Coronal Imager Flight of 2018 May 29

2020 ◽  
Vol 896 (1) ◽  
pp. 51
Author(s):  
Harry P. Warren ◽  
Jeffrey W. Reep ◽  
Nicholas A. Crump ◽  
Ignacio Ugarte-Urra ◽  
David H. Brooks ◽  
...  
Keyword(s):  
High Temperature ◽  
High Resolution ◽  
Active Region ◽  
Solar Active Region

High-resolution Spectroscopic Imaging of Counter-streaming Motions in Solar Active Region Magnetic Loops

2019 ◽  
Vol 881 (1) ◽  
pp. L25
Author(s):  
Xu Yang ◽  
Wenda Cao ◽  
Haisheng Ji ◽  
Parida Hashim ◽  
Jinhua Shen
Keyword(s):  
High Resolution ◽  
Active Region ◽  
Spectroscopic Imaging ◽  
Solar Active Region

High-resolution photography of the solar chromosphere

Solar Physics ◽  
1968 ◽  
Vol 5 (4) ◽  
pp. 489-497 ◽  
Author(s):  
R. E. Loughhead
Keyword(s):  
High Resolution ◽  
Solar Chromosphere

High-Resolution Observations of Fast Events in the Solar Chromosphere

2006 ◽  
Vol 648 (1) ◽  
pp. L67-L70 ◽  
Author(s):  
M. J. van Noort ◽  
L. H. M. Rouppe van der Voort
Keyword(s):  
High Resolution ◽  
Solar Chromosphere

High-resolution photography of the solar chromosphere

Solar Physics ◽  
1968 ◽  
Vol 4 (2) ◽  
pp. 185-195 ◽  
Author(s):  
R. E. Loughhead ◽  
R. J. Bray ◽  
E. J. Tappere ◽  
J. G. Winter
Keyword(s):  
High Resolution ◽  
Solar Chromosphere
Sign in / Sign up

Export Citation Format

Share Document