Back to Volume
Paper: Effects of Spectral Line Formation Height in Time-Distance Helioseismology
Volume: 456, The Fifth Hinode Science Meeting
Page: 57
Authors: Nagashima, K.; Parchevsky, K. V.; Zhao, J.; Duvall, T. L.; Jr.; Kosovichev, A. G.; Sekii, T.
Abstract: To understand the effect of the formation-height difference in time-distance helioseismology analyses, we consider the wave behavior above the surface. We show that by using the numerically-simulated wavefields at two different heights this difference may cause travel-time shifts due to the non-stationary character of waves excited by near-surface acoustic sources. This needs to be taken into account in multi-wavelength helioseismology and measurements close to the solar limb.
Back to Volume