Abstract
Rapid growth of observational helioseismology continues unabated. Several major trends are obvious in instrumentation for the observation of p-mode oscillations. These include great improvements in angular resolution and fidelity, temporal coverage, signal quality and the planning of long-term and cooperative measurements. While progress in the observation of g modes is slow, p-mode seismic imaging is advancing rapidly. Major trends are also affecting the reduction of p-mode observations. Among these are the development of techniques for handling huge amounts of data and reduction methods which either suppress or allow for imperfect data. These imperfections include leakages in temporal and spatial domains as well as random noise and various systematic biases. Analysis of oscillation spectra is moving to fitting of individual spectral features rather than the use of dangerous cross-correlation methods. Special reduction methods are being developed for seismic imaging and localized oscillation observations. Recent observational results have mainly dealt with the form of internal solar rotation, changes in the frequencies of p modes perhaps related to the solar activity cycle and seismic imaging. In the next decade a flood of high quality data, reduced and analyzed with improved techniques and with cooperation of solar modelers and theoreticians, will lead to a high fidelity picture of the structure and dynamics of the solar interior.
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© 1990 Springer-Verlag
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Harvey, J.W. (1990). Trends in helioseismology observation and data reduction. In: Osaki, Y., Shibahashi, H. (eds) Progress of Seismology of the Sun and Stars. Lecture Notes in Physics, vol 367. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-53091-6_72
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DOI: https://doi.org/10.1007/3-540-53091-6_72
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