Phase Jumps in Local Helioseismology

Details Phase Jumps in Local Helioseismology Phase Jumps in Local Helioseismology

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009soph..254..241c&link_type=abstract

Solar Physics, Volume 254, Issue 2, pp.241-257

Physics

9

Waves, Magnetohydrodynamic, Helioseismology, Theory

Scientific paper

Helioseismic rays trapped in a nonmagnetic acoustic cavity suffer a +90° phase jump at their lower (Lamb) turning point and -90° at the upper (acoustic cutoff) reflection point. That the two cancel allows helioseismologists to effectively assume that phase is locally continuous along a ray path joining two surface points. However, in strong surface magnetic field, as found in sunspots, it is shown - for an isothermal model with uniform magnetic field - that the phase jump for fast magnetoacoustic rays that penetrate the acoustic/Alfvénic equipartition level ( c= a) is around -120°. Moreover, there are further negative phase jumps on the upgoing and downgoing legs at c= a that add to the net phase change. Neglecting these effects can lead to a misinterpretation of helioseismic data in terms of travel-time shifts.

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