Download Advances in Geophysics, Vol. 8 by H.E. Landsberg (ed.), J. Van Mieghem (ed.) PDF

By H.E. Landsberg (ed.), J. Van Mieghem (ed.)

ISBN-10: 0120188082

ISBN-13: 9780120188086

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G . ATHAY AND C. S. WARWICK Their measurements were confined to the longitudinal component of the field as shown by the Zeeman splitting of certain iron lines in the solar photosphere. But they conclusively established the existence of a field of reasonably uniform character with a strength of about one gauss a t the poles. , the north rotation pole of the sun was of opposite polarity to the north terrestrial pole. In May 1957, the southern rotation pole underwent a reversal in magnetic polarity that was followed in November 1958 by a similar reversal in the Northern Hemisphere [29].

At t,he wavelengths of the st,ronger helium lines, not normally present in the Fraunhofcr spect,rum, flares may produce either absorption or emission features. he same flare. he disc have been much discussed in the literature, but with rat,her fruitless results. Great difficulties in the int,erpretation of the spectra again arise because of gross departures from t>hermodynamic equilibrium and an unknown geometry. hat the spectrum of the flare itself can be obtained simply by subt,racting from the observed spect,rum the normal disc spectrum.

E. Hale in 1908 of the strong magnetic fields in active regions of the sun opened the way for a new class of theories of solar activity in which magnetic field energy played its rightfully major role. Since that time it has been found that the sun also possesses a general magnetic field oriented in a direction parallel to the rotation axis, suspected but never properly established by Hale. I t has also been discovered that there are extensive regions of the sun's disc, not characterized by any pronounced visual features of activity, which exhibit measurable magnetic field anomalies.

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