Features of the Sunspot Distribution over the Solar Disk in 1874–2016

2021 ◽  
Vol 61 (7) ◽  
pp. 1038-1044
Author(s):  
E. S. Vernova ◽  
M. I. Tyasto ◽  
D. G. Baranov
Keyword(s):  
Solar Disk

The Heights of Solar Radio Sources at 1424 MHz and 696 MHz

1969 ◽  
Vol 1 (5) ◽  
pp. 192-194 ◽  
Author(s):  
D. G. Cole ◽  
R. F. Mullaly
Keyword(s):  
Solar Activity ◽  
High Resolution ◽  
Solar Disk ◽  
Previous Investigation ◽  
Solar Radio ◽  
Radio Sources ◽  
Grating Interferometer ◽  
Maximum Solar Activity

The heights of solar radio sources at 1424 MHz and 696 MHz have been measured during the years 1965 and 1966. Solar activity at this time was near minimum. The number of radio sources appearing on the solar disk rarely exceeded three at any time and it thus was possible to resolve the majority of these with a high resolution grating interferometer. Many of the previous height measurements at these frequencies have been made near times of maximum solar activity and the confusion of sources within the beam has limited their accuracy. The number of sources studied here is quite considerably higher than in any previous investigation at these frequencies, and the period of observation has been continuous.

The spectra of near-vertical structures on the solar disk

Solar Physics ◽  
1972 ◽  
Vol 27 (1) ◽  
pp. 27-33 ◽  
Author(s):  
O. R. White
Keyword(s):  
Solar Disk

scholarly journals Chromospheric diagnosis with forward scattering polarization

2014 ◽  
Vol 10 (S305) ◽  
pp. 146-153
Author(s):  
E. S. Carlin
Keyword(s):  
Radiative Transfer ◽  
Solar Disk ◽  
Disk Center ◽  
Forward Scattering ◽  
Dynamic Effects ◽  
Polarity Inversion ◽  
Physical Context ◽  
Hanle Effect ◽  
Definition Of ◽  
Spatial Maps

AbstractIs it physically feasible to perform the chromospheric diagnosis using spatial maps of scattering polarization at the solar disk center? To investigate it we synthesized polarization maps (in 8542 Å) resulting from MHD solar models and NLTE radiative transfer calculations that consider Hanle effect and vertical macroscopic motions. After explaining the physical context of forward scattering and presenting our results, we arrive at the definition of Hanle polarity inversion lines. We show how such features can give support for a clearer chromospheric diagnosis in which the magnetic and dynamic effects in the scattering polarization could be disentangled.

scholarly journals Un gruppo scultoreo da Dendera al Museo del Cairo: due fanciulli divini e i due luminari

2011 ◽  
pp. 115-127
Author(s):  
Giuseppina Capriotti-Vittozzi ◽  
Keyword(s):  
Solar Disk ◽  
Twin Children

The sculptural group in stone reconsidered in this article is a representation of a couple of youthful figures, standing entwined in the coils of two large serpents, crowned with a solar disk and a lunar crescent. The statue was discovered in Dendera in 1918 and is now in the Egyptian Museum in Cairo (JE 46278). A hypothetical identification proposed by the author would see in the figures the twin children of Cleopatra VII and Mark Anthony, represented here as the two Egyptian astral deities. The author explores the iconographic and stylistic issues involved, arriving at a late Ptolemaic date for the sculpture, fitting for the proposed identification.

scholarly journals Models and data analysis tools for the Solar Orbiter mission

2020 ◽  
Vol 642 ◽  
pp. A2 ◽  
Author(s):  
A. P. Rouillard ◽  
R. F. Pinto ◽  
A. Vourlidas ◽  
A. De Groof ◽  
W. T. Thompson ◽  
...  
Keyword(s):  
Data Analysis ◽  
Solar Disk ◽  
Source Region ◽  
Solar Interior ◽  
The Sun ◽  
Science Operations ◽  
Wide Range ◽  
Tools And Techniques ◽  
Orbiter Mission ◽  
Current Modelling

Context. The Solar Orbiter spacecraft will be equipped with a wide range of remote-sensing (RS) and in situ (IS) instruments to record novel and unprecedented measurements of the solar atmosphere and the inner heliosphere. To take full advantage of these new datasets, tools and techniques must be developed to ease multi-instrument and multi-spacecraft studies. In particular the currently inaccessible low solar corona below two solar radii can only be observed remotely. Furthermore techniques must be used to retrieve coronal plasma properties in time and in three dimensional (3D) space. Solar Orbiter will run complex observation campaigns that provide interesting opportunities to maximise the likelihood of linking IS data to their source region near the Sun. Several RS instruments can be directed to specific targets situated on the solar disk just days before data acquisition. To compare IS and RS, data we must improve our understanding of how heliospheric probes magnetically connect to the solar disk. Aims. The aim of the present paper is to briefly review how the current modelling of the Sun and its atmosphere can support Solar Orbiter science. We describe the results of a community-led effort by European Space Agency’s Modelling and Data Analysis Working Group (MADAWG) to develop different models, tools, and techniques deemed necessary to test different theories for the physical processes that may occur in the solar plasma. The focus here is on the large scales and little is described with regards to kinetic processes. To exploit future IS and RS data fully, many techniques have been adapted to model the evolving 3D solar magneto-plasma from the solar interior to the solar wind. A particular focus in the paper is placed on techniques that can estimate how Solar Orbiter will connect magnetically through the complex coronal magnetic fields to various photospheric and coronal features in support of spacecraft operations and future scientific studies. Methods. Recent missions such as STEREO, provided great opportunities for RS, IS, and multi-spacecraft studies. We summarise the achievements and highlight the challenges faced during these investigations, many of which motivated the Solar Orbiter mission. We present the new tools and techniques developed by the MADAWG to support the science operations and the analysis of the data from the many instruments on Solar Orbiter. Results. This article reviews current modelling and tool developments that ease the comparison of model results with RS and IS data made available by current and upcoming missions. It also describes the modelling strategy to support the science operations and subsequent exploitation of Solar Orbiter data in order to maximise the scientific output of the mission. Conclusions. The on-going community effort presented in this paper has provided new models and tools necessary to support mission operations as well as the science exploitation of the Solar Orbiter data. The tools and techniques will no doubt evolve significantly as we refine our procedure and methodology during the first year of operations of this highly promising mission.

The brightness of the solar disk in the continuum in the region 1.0?2.4 �m

Solar Physics ◽  
1994 ◽  
Vol 152 (1) ◽  
pp. 47-52 ◽  
Author(s):  
E. A. Makarova ◽  
E. M. Roshchina ◽  
A. P. Sarychev
Keyword(s):  
Solar Disk ◽  
The Continuum

Processing Method Effects on Solar Diameter Measurements: Use of Data Gathered by the Solar Disk Sextant

Solar Physics ◽  
2008 ◽  
Vol 247 (2) ◽  
pp. 225-248 ◽  
Author(s):  
D. Djafer ◽  
G. Thuillier ◽  
S. Sofia ◽  
A. Egidi
Keyword(s):  
Solar Disk ◽  
Processing Method ◽  
Solar Diameter ◽  
Use Of Data ◽  
Method Effects

Artificial neural networks in the problem of determining the position and size of the solar disk in wide-angle photographs of the sky

2021 ◽  
Author(s):  
Mikhail Borisov ◽  
Mikhail Krinitskiy
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Artificial Neural Networks ◽  
Solar Disk ◽  
Weather Conditions ◽  
Wide Angle ◽  
Know How ◽  
The Neural Network ◽  
Artificial Neural ◽  
The Moment

<p>Total cloud score is a characteristic of weather conditions. At the moment, there are algorithms that automatically calculate cloudiness based on a photograph of the sky These algorithms do not know how to find the solar disk, so their work is not absolutely accurate.</p><p>To create an algorithm that solves this data, the data used, obtained as a result of sea research voyages, is used, which is marked up for training the neural network.</p><p>As a result of the work, an algorithm was obtained based on neural networks, based on a photograph of the sky, in order to determine the size and position of the solar disk, other algorithms can be used to work with images of the visible hemisphere of the sky.</p>

Sign in / Sign up

Export Citation Format

Share Document