Solar source of the interplanetary sector structure
Rent the article at a discountRent now
* Final gross prices may vary according to local VAT.Get Access
The interplanetary sector structure observed by the IMP-1 satellite during three solar rotations in 1963–4 is compared with the photospheric magnetic field structure observed with the solar magnetograph at Mt. Wilson Observatory. The interplanetary sector structure was most prominent on the sun in latitudes between 10 °N and 20 °N, although the average heliographic latitude of the satellite was 3 1/2 °S. A superposed-epoch analysis of the calcium plage structure obtained from the Fraunhofer Institute daily maps of the sun is used to discuss the relation between the structure of the plages and the interplanetary sector structure. A possible explanation for the observations is discussed in terms of a North-South asymmetry in the flow of the solar wind. It is suggested that these observations favor the “equinoctial” hypothesis as compared with the “axial” hypothesis for the explanation of the semi-annual maxima in geomagnetic activity.
- Bartels, J.: 1932, ‘Terrestrial Magnetic Activity and its Relations to Solar Phenomena’, Terrest. Magnetism Atmospheric Elec. 37, 1.
- Bartels, J.: 1963, ‘Discussion of Time Variations of Geomagnetic Activity Indices Kp and Ap, 1932–61’, Ann. Geophys. 19, 1.
- Bell, B.: 1961, ‘Major Flares and Geomagnetic Activity’, Smithsonian Contributions to Astrophysics 5, 69.
- Bell, B.: 1962, ‘North-South Asymmetry in Solar Spottedness and in Great-Storm Sources’, Smithsonian Contributions to Astrophysics 5, 187.
- Cortie, A. L.: 1912, ‘Sunspots and Terrestrial Magnetic Phenomena, 1898–1911; the Cause of the Annual Variation of Magnetic Disturbance’, Monthly Notices Roy. Astron. Soc. 73, 52.
- Currie, R. G.: 1966, ‘The Geomagnetic Spectrum-40 days to 5.5 years’, J. Geophys. Res. 71, 4576.
- Howard, R.: 1959, ‘Observations of Solar Magnetic Fields’, Astrophys. J. 130, 193.
- Ness, N. F.: 1965, ‘The Earth's Magnetic Tail’, J. Geophys. Res. 70, 2989.
- Ness, N. F. and Wilcox, J. M.: 1966, ‘Extension of the Photospheric Magnetic Field into Interplanetary Space’, Astrophys. J. 143, 23.
- Ness, N. F., Scearce, C. S., and Seek, J. B.: 1964, ‘Initial Results of the IMP 1 Magnetic Field Experiment’, J. Geophys. Res. 69, 3531.
- Parker, E. N.: 1963, Interplanetary Dynamical Processes. John Wiley & Son, Inc., New York.
- Wilcox, J. M.: 1965, ‘On a Possible North-South Asymmetry in the Solar Wind’, Irish Astron. J. 7, 82.
- Wilcox, J. M.: 1966, ‘Solar and Interplanetary Magnetic Fields’, Science 152, 161.
- Wilcox, J. M. and Ness, N. F.: 1965, ‘Quasi-Stationary Corotating Structure in the Interplanetary Medium’, J. Geophys. Res. 70, 5793.
- Solar source of the interplanetary sector structure
Volume 1, Issue 3-4 , pp 437-445
- Cover Date
- Print ISSN
- Online ISSN
- Kluwer Academic Publishers
- Additional Links