The sign of temperature inhomogeneities deduced from time-distance helioseismology

Details The sign of temperature inhomogeneities deduced from time-distance helioseismology The sign of temperature inhomogeneities deduced from time-distance helioseismology

2000-04-11

arxiv.org/abs/astro-ph/0004140v1

Astronomy and Astrophysics

Astrophysics

accepted by Solar Physics

Scientific paper

Inhomogeneities in wave propagation conditions near and below the solar surface have been detected by means of time-distance helioseismology. Here we calculate the effect of temperature inhomogeneities on the travel times of sound waves. A temperature increase, e.g. in active regions, not only increases the sound speed but also lengthens the path along which the wave travels because the expansion of the heated layers shifts the upper turning of the waves upward. Using a ray tracing approximation we find that in many cases the net effect of a temperature enhancement is an {\it increase} of the travel times. We argue that the reduced travel times that are observed are caused by a combination of magnetic fields in the active region and {\it reduced} subsurface temperatures. Such a reduction may be related to the increased radiative energy loss from small magnetic flux tubes.

Affiliated with

Also associated with

No associations

Rating

The sign of temperature inhomogeneities deduced from time-distance helioseismology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The sign of temperature inhomogeneities deduced from time-distance helioseismology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The sign of temperature inhomogeneities deduced from time-distance helioseismology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-265910