Local Helioseismology and Heating of the Chromosphere and Corona

R. Kariyappa, P. Scherrer, P. VenkataKrishnan, A. Vigouroux, & K. Wilhelm

Objectives:

The main goal of the proposed research is to identify and understand the influence of localized inhomogeneties, like sunspots, flaculae, plages, network and intranetwork regions, on the solar oscillations and to explain the heating mechanisms of the chromosphere and corona. The SOHO/MDI/SOI experiments provide the measurements in high resolution and the full-disk images of the Sun in velocity, magnetic field, line intensity, and continuum intensity of the photosphere. Whereas the SOHO/SUMER experiment will provide the images of the Sun from the chromosphere through the transition region and to the inner corona and these observations provide detailed information on the various features. Combining the images of the Sun obtained from MDI and SUMER, will yeild to study the local helioseismology right from the low photosphere to the corona. We propose to apply the wavelet analysis technique to solar oscillations at different heights and different regions of the Sun. It is a very powerful tool to obtain information on the temporal behaviour of an oscillatory signals and the temporal lags between the signal of the different heights and at different regions of the Sun. Hence to explain the nature of the wave propagation and physical mechanisms of the heating of the chromosphere and corona.


Complete text of proposal.