A study of the Bremsstrahlung of plasma at about 1 A.U. in times of quiet sun and flare activity

The depressions at centimetric and millimetric wavelengths associated with the filaments are studied using already published maps as well as unpublished observations from the Effelsberg 100 m radio telescope of the M.P.I., Bonn. The study has been restricted to large Ha quiescent prominences of relatively simple shape, situated far from the limb and from active regions. The data has been reduced employing one method whose main characteristics are choice of a local quiet sun definition and avoidance of the unstable process of deconvolution.

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International Geophysical Calendar for the international years of the quiet sun, 1964 and 1965

Journal of Geophysical Research Atmospheres ◽

10.1029/jz068i018p05318 ◽

1963 ◽

Vol 68 (18) ◽

pp. 5318

Author(s):

A. H. Shapley ◽

J. Virginia Lincoln

Keyword(s):

Quiet Sun ◽

International Geophysical

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SUMER Observations of the Quiet‐Sun Transition Region

The Astrophysical Journal ◽

10.1086/306794 ◽

1999 ◽

Vol 512 (2) ◽

pp. 992-1005 ◽

Cited By ~ 33

Author(s):

N. W. Griffiths ◽

G. H. Fisher ◽

D. T. Woods ◽

O. H. W. Siegmund

Keyword(s):

Transition Region ◽

Quiet Sun

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A Search for the Counterparts of Quiet-Sun Radio Transients in Extreme Ultraviolet Data

Solar Physics ◽

10.1007/s11207-021-01877-3 ◽

2021 ◽

Vol 296 (8) ◽

Author(s):

Surajit Mondal

Keyword(s):

Extreme Ultraviolet ◽

Quiet Sun ◽

Radio Transients

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On the Short Time Scale Evolutionary History of the Contact Binary VW Cephei

Highlights of Astronomy ◽

10.1017/s1539299600021468 ◽

1998 ◽

Vol 11 (1) ◽

pp. 396-396

Author(s):

I. Pustylnik

Keyword(s):

Evolutionary History ◽

Light Curves ◽

Published Data ◽

Short Time Scale ◽

Flare Activity ◽

Considerable Portion ◽

History Of ◽

Contact Binary ◽

Elongation Phase ◽

Short Time

We study the short-time evolutionary history of the well-known contact binary VW Cep. Our analysis is based partly on the numerous UBV lightcurves obtained at Tartu Observatory, IUE spectra, and samples from the published data. Special attention is given to the effects of asymmetry of the light curves. A higher degree of asymmetry outside the eclipses along with the significant displacements of the brightness maxima in respect to the elongation phase is interpreted as evidence that a considerable portion of the flaring source is concentrated close to the neck connecting the components. We discuss the nature of asymmetry in terms of possible mass exchange and the flare activity and compare the results of our model computations with the record of orbital period variations over the last 60 years.

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Solitons in the Close Binary Systems

Highlights of Astronomy ◽

10.1017/s1539299600021481 ◽

1998 ◽

Vol 11 (1) ◽

pp. 398-398

Author(s):

Kenji Tanabe

Keyword(s):

Gravity Waves ◽

Binary Systems ◽

Kdv Equation ◽

Frame Of Reference ◽

Close Binary ◽

Flare Activity ◽

Lagrangian Point ◽

Nls Equation ◽

Close Binary Systems ◽

The Earth

Propagation of the surface waves of the lobe-filing components of close binary systems is investigated theoretically. Such waves are considered to be analogous to the gravity waves of water on the earth. As a result, the equations of the surface wave in the rotating frame of reference are reduced to the so-called Kortewegde Vries (KdV) equation and non-linear Schroedinger (NLS) equation according to its ”depth”. Each of these equations is known to have the solution of soliton. When this soliton is sent to the other component of the binary system through the Lagrangian point, it can give rise to the flare activity observed in some kinds of close binary systems.

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