By J. B. Zirker
"The complete riveting tale of helioseismology is now instructed by means of J. B. Zirker in Sunquakes. Zirker is that infrequent animal who can either converse the main tough technical aspect and make it available. - New Scientist"
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Extra info for Sunquakes: Probing the Interior of the Sun
When recorded in this way, the short-wavelength oscillations, which have many peaks and valleys over the solar disk, tend to cancel one another; only oscillations that cover a whole hemisphere or quadrant survive. These simple modes of low degree (L ϭ 0, 1, 2) are especially interesting because they penetrate deep into the sun, but they are diﬃcult to detect because their amplitudes are only a few meters per second. ) Nevertheless, these resonance scattering cells are so stable and so sensitive that they can easily measure such small speeds.
6 A “standard model” of the Sun, computed by John Bahcall and Roger Ulrich. The panels show the radial distributions of (a) energy production, (b) temperature, (c) gas density. Through many trials, and much computation, astrophysicists have arrived at a set of working models that diﬀer only slightly in details. No one model has been adopted as “The Standard,” but all of them are based on the simplest possible physical assumptions and the most accurate physical data. 6 billion years. 6 illustrates one such model.
His book Hydrodynamics has remained a standard text since 1895. However, the book is highly mathematical. Lighthill once said that one could read all of Lamb’s book and never realize that water is wet. Lamb discovered an essential property of sound waves in a gaseous atmosphere. 3). Only waves with frequencies higher than the cutoﬀ are able to travel freely. At frequencies below the cutoﬀ, the waves are “evanescent”—they fade out a short distance from their source. Lighthill was also interested in many other subjects, including hurricanes, the ﬂow of water around ships, and the ﬂow of air over aircraft wings.
Sunquakes: Probing the Interior of the Sun by J. B. Zirker