Characterizing the propagation of gravity waves in 3D nonlinear simulations of solar-like stars

The revolution of helio- and asteroseismology provides access to the detailed properties of stellar interiors by studying the star's oscillation modes. Among them, gravity (g) modes are formed by constructive interferences between progressive internal gravity waves (IGWs), propagating in stellar radiative zones. Our new 3D nonlinear simulations of the interior of a solar-like star allows us to study the excitation, propagation, and dissipation of these waves. The aim of this article is to clarify our understanding of the behavior of IGWs in a 3D radiative zone and to provide a clear overview of their properties. We use a method of frequency filtering that reveals the path of {individual} gravity waves of different frequencies in the radiative zone. We are able to identify the region of propagation of different waves in 2D and 3D, to compare them to the linear raytracing theory and to distinguish between propagative and standing waves (g modes). We also show that the energy carried by waves is distributed in different planes in the sphere, depending on their azimuthal wave number. We are able to isolate individual IGWs from a complex spectrum and to study their propagation in space and time. In particular, we highlight in this paper the necessity of studying the propagation of waves in 3D spherical geometry, since the distribution of their energy is not equipartitioned in the sphere.Comment: 14 pages, 12 figues, accepted by Astronomy & Astrophysic

The Maine Annex, vol. 2, no. 18

The Maine Annex, published by the students of the University of Maine at the Brunswick Campus, was launched January 10, 1947. Editors introduced the publication as the product of a group of progressive students attending the Brunswick Campus. The goal of the publication, according to editors, was to tell the story of our life on this campus. The four-page, tabloid-sized paper included display advertising from area businesses

Comparison of Methods for Purification of DNA From Rice

Three techniques were employed to purify genomic DNA from deomstic rice (Oryza sativa L). Following extraction, the DNA was electrophoresed through agarose to determine its integrity. We determined that spooling yielded better quality, through lower quantity DNA than either of the other two techniques

The Maine Annex, vol. 2, no. 15

Following World War II, the federal G.I. Bill enabled approximately 2.3 million, predominantly white male Veterans to receive a post-secondary education. To accommodate increased enrollment in 1946, the University of Maine established the Brunswick Campus at the former Brunswick Naval Air Station. The remote campus operated until spring 1949, when Veteran registrations waned

The Maine Annex, vol. 2, no. 20

The Maine Annex, published by the students of the University of Maine at the Brunswick Campus, was launched January 10, 1947. Editors introduced the publication as the product of a group of progressive students attending the Brunswick Campus. The goal of the publication, according to editors, was to tell the story of our life on this campus. The four-page, tabloid-sized paper included display advertising from area businesses

The Maine Annex, vol. 2, no. 11

The Maine Annex begins to discuss the House Committee on Un-American Activities (HCUA), growing fears of private and public citizens suspected of fascist or communist activities, and whether war with Russia was inevitable. The paper also notes the pending presentation about Islam by British Army officer and adventurer Colonel R. V. C. Bodley

The Maine Annex, vol. 2, no. 9

The Maine Annex Editor-in-Chief, Roy W. Nickerson investigates rising costs at the Annex campus bookstore including the price of Coca-Cola increasing from 5 to 7-cents