Description
ABSTRACT
In the mid-1970’s, a 160-min periodic signal was detected coming from the Sun and the discoverers interpreted this as a gravity- mode (g-mode) oscillation. That is to say, they supposed this signal to be the vibration of the Solar surface. Similar signals where also detected in a number of extraterrestrial sources which include Active Galactic Nuclei (AGN). Later re-analysis rebutted this signal with the simple remark that it was no more than an artifact induced by the diurnal effects of the Earth’s atmospheric extinction. A polemic regarding this signal is that if it is real, it would require a drastic revision of the Standard Solar Model (SSM) as the Sun will have to be treated as a homogeneous ball of gas and this assumption runs contrary to the SSM. We propose a model that seeks to proffer an explanation — i.e., a model requiring no drastic revision of the SSM. Our modification of the SSM is that we assume that the convective envelope of the Sun (and similar stars) is the one that is homogeneous with the Core intactly returning all off its properties that it is endowed with in the SSM. We believe that despite the fact that dedicated searches for the 160-min have come-out empty-handed, our model may very well be important in explaining global g-mode oscillations of stellar surface — hence, pulsation. In-fact, our model allows for the 160-min signal to shift to a different frequency depending on the present density of the convective envelope, the meaning of which is that if one searches for the 160-min signal and does not find it, it may have shifted to a new frequency. All one needs to do is to search for global g-mode oscillations — and, with this in mind, the SOHO-satellite’s search seams to have detected a 24-min signal rather than the polemical 160-min signal.
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