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| 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. |
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