Magnetic field strength implied in the eigenfrequency variation related to the solar cycle

Details Magnetic field strength implied in the eigenfrequency variation related to the solar cycle Magnetic field strength implied in the eigenfrequency variation related to the solar cycle

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..357n&link_type=abstract

In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,

Computer Science

Sound

Solar Cycle, Magnetic Field

Scientific paper

During the solar cycle, the acoustic eigenfrequency shift is roughly independent of the degree, for modes of degrees less than 10. Following the approach of Nghiem (SOHO/GONG 2000 and this conference), that very typical behavior can be interpreted as a change in the mode cavity size. We consider here the case where it is mainly due to a pressure scale height variation, while the sound speed change can be neglected. Using the formalism developed and the LOWL data obtained from 1996 to 2000, the change in surface pressure with the solar cycle is deduced. Assuming that all this variation has a magnetic origin, we infer the related profile of magnetic field change with the cycle. From SOHO data, we also give an upper limit of the absolute magnetic field.

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