High-degree p-modes and the sun's evolving surface

Details High-degree p-modes and the sun's evolving surface High-degree p-modes and the sun's evolving surface

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..173r&link_type=abstract

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

Physics

2

Solar Oscillations, High-Degree Frequencies, Temporal Frequency Shifts

Scientific paper

Two of the most glaring problems in contemporary helioseismology are the limited availability of high-degree p-mode frequencies for use in inversions of solar internal structure and the lack of high-degree frequency splitting coefficients for use in inversions of solar internal dynamics. A third major problem is the lack of a consensus regarding the mechanism underlying the temporal shifts of the p-mode frequencies. The lack of high-degree frequencies and the lack of similar high-degree frequency splittings have occurred because of the inherent difficulties in measuring such frequencies and frequency splittings in high-degree power spectra without the inclusion of numerous systematic errors. We will first point out the importance of high-degree p-modes to helioseismic inversions. Next, we will describe recent progress we have made in estimating high-degree frequencies, including the use of both asymmetric and symmetric profiles in our fits. We will then demonstrate that the inclusion of corrections for the eigenfunction distortion due to latitudinal differential rotation removes long-standing discontinuities in the high-degree frequency splittings. We will go on to describe our recent efforts of increasing the sensitivity of the p-mode frequencies to changing levels of solar activity through the use of observing runs which are as short as three days in duration. Finally, we will also describe planned efforts at verifying recent discoveries in solar internal dynamics through the reduction and analysis of full-disk Dopplergrams obtained during Solar Cycle 22 prior to the beginning of the GONG and MDI projects. Taken together, the recent improvements in the estimation of high-degree frequencies, frequency splittings, and the availability of useful data from Solar Cycle 22 indicate that a renaissance in global helioseismology is now at hand.

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