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.