Journal ArticleDOI
Correlation between the Near-Earth Solar Wind Parameters and the Source Surface Magnetic Field
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TLDR
In this paper, the solar magnetic field at the Earth's projection onto the solar-wind source surface has been calculated for each day over a long time interval (1976-2004) and the data have been compared with the daily mean solar wind velocities and various components of the interplanetary magnetic field near the Earth.Abstract:
The solar magnetic field B
s at the Earth’s projection onto the solar-wind source surface has been calculated for each day over a long time interval (1976–2004). These data have been compared with the daily mean solar wind (SW) velocities and various components of the interplanetary magnetic field (IMF) near the Earth. The statistical analysis has revealed a rather close relationship between the solar-wind parameters near the Sun and near the Earth in the periods without significant sporadic solar and interplanetary disturbances. Empirical numerical models have been proposed for calculating the solar-wind velocity, IMF intensity, and IMF longitudinal and B
z components from the solar magnetic data. In all these models, the B
s value plays the main role. It is shown that, under quiet or weakly disturbed conditions, the variations in the geomagnetic activity index Ap can be forecasted for 3–5 days ahead on the basis of solar magnetic observations. Such a forecast proves to be more reliable than the forecasts based on the traditional methods.read more
Citations
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Journal ArticleDOI
Puzzles of the interplanetary magnetic field in the inner heliosphere
Olga Khabarova,V. N. Obridko +1 more
TL;DR: In this paper, a quasi-continuous magnetic reconnection, occurring both at the heliospheric current sheet and at local current sheets inside the IMF sectors, is considered as a key process responsible for the solar wind turbulization with heliocentric distance as well as for the breakdown of the frozen-in IMF law.
Journal ArticleDOI
Contrast of Coronal Holes and Parameters of Associated Solar Wind Streams
TL;DR: In this article, it was shown that the contrast of coronal holes, just as their size, determines the velocity of the solar wind streams, and that the correlations with the velocity are rather high (0.70-0.89) especially during the periods of moderate activity, and could be used for everyday forecast.
Journal ArticleDOI
Forecasting the velocity of quasi-stationary solar wind and the intensity of geomagnetic disturbances produced by it
TL;DR: In this paper, a review is given of contemporary approaches to solving the problem of medium-term forecast of the velocity of quasi-stationary solar wind (SW) and of the intensity of geomagnetic disturbances caused by it.
Journal ArticleDOI
Relationship between the Parameters of Coronal Holes and High-Speed Solar Wind Streams over an Activity Cycle
V. N. Obridko,B. D. Shelting +1 more
TL;DR: In this paper, a catalog of equatorial coronal holes has been compiled, and their brightness and area variations during the cycle have been analyzed, showing that CH is not merely an undisturbed zone between the active regions.
Journal ArticleDOI
The interplanetary magnetic field: Radial and latitudinal dependences
TL;DR: In this paper, the results of the analysis of spacecraft measurements at 1.4 AU are presented within the scope of the large-scale interplanetary magnetic field (IMF) structure investigation.
References
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Journal ArticleDOI
Energy coupling between the solar wind and the magnetosphere
TL;DR: In this article, it was shown that epsilon is the primary factor controlling the time development of magnetospheric substorms and storms and that the power generated by the dynamo can be identified as ϵ through the use of a dimensional analysis, indicating that the magnetosphere is closer to a directly driven system than to an unloading system which stores the generated energy before converting it to substorm and storm energies.
Journal ArticleDOI
Solar wind speed and coronal flux-tube expansion
Y.M. Wang,N. R. Sheeley +1 more
TL;DR: In this article, the authors show that the solar wind speed at 1 AU and the rate of magnetic flux tube expansion in the corona are inversely correlated with observations extending over the last 22 years.
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On potential field models of the solar corona
Y. M. Wang,N. R. Sheeley +1 more
TL;DR: In this article, it is argued that the observed photospheric field should first be corrected for line-of-sight projection and then matched to the radial component of the potential field.
Journal ArticleDOI
The solar magnetic field
TL;DR: The magnetic field of the Sun is the underlying cause of many diverse phenomena combined under the heading of solar activity as discussed by the authors, where the authors describe the magnetic field as it threads its way from the bottom of the convection zone to the solar surface, where it manifests itself in the form of sunspots and faculae, and beyond into the outer solar atmosphere and, finally, into the heliosphere.
Journal ArticleDOI
The solar wind-magnetosphere energy coupling and magnetospheric disturbances
TL;DR: In this paper, the influence of energy coupling between the solar wind and the magnetosphere on magnetospheric disturbances is discussed and a derivation of the solar-magnetosphere energy coupling function, which has been found to correlate well with the total magnetosphere energy production rate is presented.