Quiet solar geomagnetic variations at observatories in symmetrical latitudes during a minimum of solar activity
Keywords:
geomagnetic variations, sunAbstract
Solar geomagnetic variations on quiet days (Sq), neglecting the small lunar contribution (L), are compared for Teoloyucan (geogr.lal 19°45', long. -99° 11') and La Quiaca (geogr.lat -22°06', long.-65°36’), located in the longitudinal sector of maximum difference between geographic and geomagnetic latitudes, the latter being 29,6° and -10,6°respectively. Given the manifest asymmetry, even during the equinoxes comparable data from Pilar (geogr.lat-31°40', long.-63°53'; geomagn.lat-20,40) are supplied.
Noon values of the geomagnetic north component of Sq can be represented by a plane model including an electrojet centered al the dip equator and two ionospheric current systems of greater latitudinal extent Application of this model to the particular group of E-months (March/April-September/October) shows that the distance between the vortices of these current systems and the equator is greater in the northern hemisphere than in the southern. Merely geomagnetic causes cannot account for this discrepancy.
Downloads
References
Berthelier A.,M. Menvielle et C. Guérin, 1991; Indices d'activité magnétique 89. Centre de recherche en physique de l'environnement terrestre el planétaire.
Chapman S. and J. Bartels, 1940; Geomagnetism; Oxford at the Clarendon Press ; vol 1; cap VII.
Chapman S. and R. S. Lindzen, 1970; Atmospheric tides, thermal and gravitational; D. Reidel Publishing Company.
Duhau S. y A. M. Osella, 1984; Estudio de las anomalías en la conductividad terrestre en la zona ecuatorial peruana. I. Análisis del sistema de corrientes ionosféricas. GEOACTA, 12(1); 295-306.
Matsushita S. and H. Maeda, 1965; On the geomagnetic solar quiet daily variation field during the IGY. Journal of Geophysical Research, 70(11); 315-338.
Onwumechilli A., 1962; Geomagnetic variations in the equatorial zone; in: Physics of Geomagnetic Phenomena, ed. by S. Matsushita and W. H. Campbell; Academic Press.
Schneider O., 1979; Interacción de mareas; GEOACTA, 9 (1); 1-21. Servicio Meteorológico Nacional (Argentina); Tabulated hourly magnetic values for the year 1976, unpublished.
Universidad Autónoma de México, 1986; Observatorio magnético de Teoloyucan, Valores magnéticos para 1976.
Vecchi M. C., M. A. Van Zele y O. Schneider, 1985; Variaciones geomagnéticas solares de días tranquilos en territorio argentino según la actividad solar, GEOACTA, 12(2); 57-70.
Downloads
Published
How to Cite
Issue
Section
License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Starting in 2022 (Vol. 43 number 2) articles will be published in the journal under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license (CC BY-NC-SA 4.0)
According to these terms, the material can be shared (copied and redistributed in any medium or format) and adapted (remixed, transformed and created from the material another work), provided that a) the authorship and the original source of its publication (journal and URL of the work), b) is not used for commercial purposes and c) the same license terms are maintained.
Prior to this date the articles were published in the journal under a Creative Commons Attribution license (CC BY)
In both cases, the acceptance of the originals by the journal implies the non-exclusive assignment of the economic rights of the authors in favor of the editor, who allows reuse, after editing (postprint), under the license that corresponds according to the edition.
Such assignment means, on the one hand, that after its publication (postprint) in the GEOACTA Magazine of the Association of Geophysicists and Geodesists, the authors can publish their work in any language, medium and format (in such cases, it is requested that it be recorded that the material was originally published in this journal); on the other, the authorization of the authors for the work to be harvested by SEDICI, the institutional repository of the National University of La Plata, and to be disseminated in the databases that the editorial team considers appropriate to increase visibility. of the publication and its authors.
Likewise, the journal encourages the authors so that after their publication in the Journal of the Association of Geophysicists and Geodesists, they deposit their productions in other institutional and thematic repositories, under the principle that offering society scientific production and Unrestricted academic scholarship contributes to a greater exchange of global knowledge.
