Astrophysics. Part B: Radio Telescopes by M. L. Meeks

By M. L. Meeks

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39, 3. Schatten, K. : 1972, in C. P. ), Solar Wind, NASA SP-308, p. 65. Svalgaard, L. and Wilcox, J . : 1975, Solar Phys. 41,461. Wilcox, 1. : 1971, in R. ), 'Solar Magnetic Fields', [AU Smp. 43,744. Wilcox, J. M. : 1974, Solar Phys. 34,461. 16 1. W. 5. Unipolar Magnetic Region A large-scale photospheric region where the magnetic elements are predominantly of one polarity . Examples are polar regions most of the time and the trailing parts of major active regions several months after their disintegration.

Beckers, 1. M. and Canfield, R. : 1976, in R. Cay rei and M. ), 'Physique des Mouvements dans les Atmospheres Stellaires', CNRS, Paris, p. 207. Christensen-Dalsgaard, J. : 1976, Nature 259, 89. Hill, H. , Stebbins, R. , and Brown, T. : 1975, Proe. 5th Int. Con. Atomic Masses and Fundamental Constants, Paris. Miehalitsanos, A. : 1973, Earth Extraterrest. Sci. 2, 125. Stein, R. F. : 1974,Ann. Rev. Astron. Astrophys. 12,407. 4. Short Period Oscillations The presence in the solar atmosphere of acoustic or magneto-acoustic waves with periods less than 100 s has often been invoked in order to carry mechanical, non-thermal, energy out of the convection zone.

Often rifts are observed bordering sharp-edge streamers as dark filaments, dark lanes or voids. 5) . Koutchmy, S. : 1970. Nature 226, 114l. MacQueen, R . , Eddy, J. , Gosling, J. , Munro, R. , Newkirk, G. A. Jr. , Poland, A. , and Ross, C. : 1974, Astrophys. J. 187, L8S . 7. een the terms condensation and enhancement. Both terms apply to the coronal parts of active regions, the active region corona. Physically, condensation refers to increased (electron) density, enhancement refers to enhanced radiation at visible, EUV, X-ray and radio wavelengths.

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