scholarly journals Radiative Transfer Effects and the Dynamics of Small‐Scale Magnetic Structures on the Sun

2000 ◽  
Vol 544 (1) ◽  
pp. 522-539 ◽  
Author(s):  
S. P. Rajaguru ◽  
S. S. Hasan
Keyword(s):  
Radiative Transfer ◽  
Small Scale ◽  
The Sun ◽  
Transfer Effects ◽  
Magnetic Structures

scholarly journals Quasi-periodic oscillations of small-scale magnetic structures and a specific method for measuring the differential rotation of the Sun

2019 ◽  
Vol 5 (1) ◽  
pp. 4-12
Author(s):  
Иван Живанович ◽  
Ivan Zhivanovich ◽  
Александр Риехокайнен ◽  
Aleksandr Riehokainen ◽  
Александр Соловьев ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Differential Rotation ◽  
Rotation Curve ◽  
Angular Resolution ◽  
Small Scale ◽  
Specific Method ◽  
The Sun ◽  
Periodic Oscillations ◽  
Magnetic Structures ◽  
Good Agreement

The SDO/HMI data with an angular resolution of 1 arcsec have been used to explore the differential rotation on the Sun, using an original “p2p” effect on the basis of the movement of small-scale magnetic structures in the photosphere of the Sun. It is shown that a stable p2p artifact inherent in the SDO/HMI data can be an effective tool for measuring the speed of various tracers on the Sun. In particular, in combination with the Fourier analysis, it allows us to investigate the differential rotation of the Sun at various latitudes. The differential rotation curve obtained from the SDO/HMI magnetograms by this method is in good agreement with the curves obtained earlier from ground-based observations.

scholarly journals Quasi-periodic oscillations of small-scale magnetic structures and a specific method for measuring the differential rotation of the Sun

2019 ◽  
pp. 3-10
Author(s):  
Иван Живанович ◽  
Ivan Zhivanovich ◽  
Александр Риехокайнен ◽  
Alexandr Riehokainen ◽  
Александр Соловьев ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Differential Rotation ◽  
Rotation Curve ◽  
Angular Resolution ◽  
Small Scale ◽  
Specific Method ◽  
The Sun ◽  
Periodic Oscillations ◽  
Magnetic Structures ◽  
Good Agreement

The SDO/HMI data with an angular resolution of 1 arcsec have been used to explore the differential rotation on the Sun, using an original “p2p” effect on the basis of the movement of small-scale magnetic structures in the photosphere of the Sun. It is shown that a stable p2p artifact inherent in the SDO/HMI data can be an effective tool for measuring the speed of various tracers on the Sun. In particular, in combination with the Fourier analysis, it allows us to investigate the differential rotation of the Sun at various latitudes. The differential rotation curve obtained from the SDO/HMI magnetograms by this method is in good agreement with the curves obtained earlier from ground-based observations.

scholarly journals On the fractal dimension of small-scale magnetic structures in the Sun

2003 ◽  
Vol 409 (3) ◽  
pp. 1127-1134 ◽  
Author(s):  
K. Janßen ◽  
A. Vögler ◽  
F. Kneer
Keyword(s):  
Fractal Dimension ◽  
Small Scale ◽  
The Sun ◽  
Magnetic Structures

scholarly journals What scatter-hoarding animals have taught us about small-scale navigation

2010 ◽  
Vol 365 (1542) ◽  
pp. 901-914 ◽  
Author(s):  
Kristy L. Gould ◽  
Debbie M. Kelly ◽  
Alan C. Kamil
Keyword(s):  
Future Research ◽  
Small Scale ◽  
The Sun ◽  
Scatter Hoarding ◽  
Geometric Properties ◽  
Cue Use ◽  
Unique System ◽  
Spatial Locations

Many animals use cues for small-scale navigation, including beacons, landmarks, compasses and geometric properties. Scatter-hoarding animals are a unique system to study small-scale navigation. They have to remember and relocate many individual spatial locations, be fairly accurate in their searching and have to remember these locations for long stretches of time. In this article, we review what is known about cue use in both scatter-hoarding birds and rodents. We discuss the importance of local versus global cues, the encoding of bearings and geometric rules, the use of external compasses such as the Sun and the influence of the shape of experimental enclosures in relocating caches or hidden food. Scatter-hoarding animals are highly flexible in how and what they encode. There also appear to be differences in what scatter-hoarding birds and rodents encode, as well as what scatter-hoarding animals in general encode compared with other animals. Areas for future research with scatter-hoarding animals are discussed in light of what is currently known.

scholarly journals How to make the Sun look less like the Sun and more like a star?

2016 ◽  
Vol 12 (S328) ◽  
pp. 237-239
Author(s):  
A. A. Vidotto
Keyword(s):  
Magnetic Field ◽  
Large Scale ◽  
Vector Fields ◽  
Radial Component ◽  
Field Vector ◽  
Small Scale ◽  
General Context ◽  
The Sun ◽  
Flux Transport ◽  
Large Scale Magnetic Field

AbstractSynoptic maps of the vector magnetic field have routinely been made available from stellar observations and recently have started to be obtained for the solar photospheric field. Although solar magnetic maps show a multitude of details, stellar maps are limited to imaging large-scale fields only. In spite of their lower resolution, magnetic field imaging of solar-type stars allow us to put the Sun in a much more general context. However, direct comparison between stellar and solar magnetic maps are hampered by their dramatic differences in resolution. Here, I present the results of a method to filter out the small-scale component of vector fields, in such a way that comparison between solar and stellar (large-scale) magnetic field vector maps can be directly made. This approach extends the technique widely used to decompose the radial component of the solar magnetic field to the azimuthal and meridional components as well, and is entirely consistent with the description adopted in several stellar studies. This method can also be used to confront synoptic maps synthesised in numerical simulations of dynamo and magnetic flux transport studies to those derived from stellar observations.

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