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Gravitational waves, although generally associated with extremely microscopic effects, can displace by hundreds of kilometers the pulsar interstellar scintillation patterns that bathe the Earth. The combination of the pulsar and the…

天体物理学 · 物理学 2008-02-03 Redouane Fakir

One proposed mechanism for heating the solar wind, from close to the sun to beyond 10 AU, invokes low-frequency, oblique, Alfven-wave turbulence. Because small-scale oblique Alfven waves (kinetic Alfven waves) are compressive, the measured…

太阳与恒星天体物理 · 物理学 2015-05-13 Benjamin D. G. Chandran , Eliot Quataert , Gregory G. Howes , Qian Xia , Peera Pongkitiwanichakul

We present the first statistical study of the anisotropy of the magnetic field turbulence in the solar wind between 1 and 200Hz, i.e. from proton to sub-electron scales. We consider 93 10-minute intervals of Cluster/STAFF measurements. We…

空间物理 · 物理学 2017-10-18 Catherine Lacombe , Olga Alexandrova , Lorenzo Matteini

Gravitational waves with frequencies below 1~nHz are notoriously difficult to detect. With periods exceeding current experimental lifetimes, they induce slow drifts in observables rather than periodic correlations. Observables with…

高能天体物理现象 · 物理学 2024-03-12 William DeRocco , Jeff A. Dror

When ambient seismic waves pass near an interferometric gravitational-wave detector, they induce density perturbations in the earth which produce fluctuating gravitational forces on the interferometer's test masses. These forces mimic a…

广义相对论与量子宇宙学 · 物理学 2009-12-30 Scott A. Hughes , Kip S. Thorne

An evolving turbulent flow such as the solar wind can be meaningfully characterized by its "turbulence age" -- an estimate of the number of nonlinear times that have elapsed during a plasma parcel's propagation from the Sun to a given point…

太阳与恒星天体物理 · 物理学 2026-03-30 Rohit Chhiber , Yanwen Wang , Arcadi V. Usmanov , William H. Matthaeus

Solar oscillations are expected to be excited by turbulent flows in the intergranular lanes near the solar surface. Time series recorded by the IMaX instrument aboard the {\sc Sunrise} observatory reveal solar oscillations at high…

Analyses of a 3D simulation of the upper layers of a solar convective envelope provide constraints on the physical quantities which enter the theoretical formulation of a stochastic excitation model of solar p modes, for instance the…

天体物理学 · 物理学 2009-11-07 R. Samadi , A. Nordlund , R. F. Stein , M. J. Goupil , I. Roxburgh

There are no strong constraints placed thus far on the amplitude of internal gravity waves (IGWs) that are stochastically excited in the radiative interiors of solar-type stars. Late F-type stars have relatively thin convective envelopes…

太阳与恒星天体物理 · 物理学 2022-11-09 Sylvain N. Breton , Allan Sacha Brun , Rafael A. García

Investigating the properties of magnetic flux emergence is one of the most important problems of solar physics. In this study we present a newly developed deep-focus time-distance measurement scheme which is able to detect strong emerging…

太阳与恒星天体物理 · 物理学 2012-03-13 Stathis Ilonidis , Junwei Zhao , Alexander G. Kosovichev

Below the acoustic cut-off frequency, oscillations are trapped within the solar interior and become resonant. However, signatures of oscillations persist above the acoustic cut-off frequency, and these travelling waves are known as…

太阳与恒星天体物理 · 物理学 2022-03-30 K. Kosak , R. Kiefer , A. M. Broomhall

The rate at which the solar wind extracts angular momentum from the Sun has been predicted by theoretical models for many decades, and yet we lack a conclusive measurement from in-situ observations. In this letter we present a new estimate…

太阳与恒星天体物理 · 物理学 2019-11-27 Adam J. Finley , Amy L. Hewitt , Sean P. Matt , Mathew Owens , Rui F. Pinto , Victor Réville

Gravitational waves have predominantly been detected using interferometric techniques, with standard approaches limited to 10 kHz and with modern advancements extending this bound to 300 kHz. To explore the largely uncharted…

广义相对论与量子宇宙学 · 物理学 2025-05-01 Eduard Atonga , Ramy Aboushelbaya , Peter A. Norreys

Ring diagram analysis of solar oscillation power spectra obtained from MDI data is performed to study the velocity fields within the solar convection zone. The three dimensional power spectra are fitted to a model with a Lorentzian profile…

天体物理学 · 物理学 2007-05-23 Sarbani Basu , H. M. Antia , S. C. Tripathy

Large-scale plasma flows in the Sun's convection zone likely play a major role in solar dynamics on decadal timescales. In particular, quantifying meridional motions is a critical ingredient for understanding the solar cycle and the…

太阳与恒星天体物理 · 物理学 2015-06-19 Shukur Kholikov , Alexander Serebryanskiy , Jason Jackiewicz

Ring diagram analysis of solar oscillation power spectra obtained from MDI data is carried out to study the velocity fields in the outer part of the solar convection zone. The three dimensional power spectra are fitted to a model which has…

天体物理学 · 物理学 2009-10-30 Sarbani Basu , H. M. Antia , S. C. Tripathy

In this second paper of the series on internal gravity waves (IGWs), we present a study of the generation and propagation of IGWs in a model solar atmosphere with diverse magnetic conditions. A magnetic field free, and three magnetic models…

太阳与恒星天体物理 · 物理学 2019-02-27 G. Vigeesh , M. Roth , O. Steiner , J. Jackiewicz

The spherical modes of gravitational waves (GWs) have become a major focus of recent detection campaigns due to the additional information they can provide about different properties of the source. However, GW detection is restricted to…

广义相对论与量子宇宙学 · 物理学 2023-12-07 Alejandro Torres-Orjuela

$PSP$ and $SolO$ data are utilized to investigate magnetic field intermittency in the solar wind (SW). Small-scale intermittency $(20-100d_{i})$ is observed to radially strengthen when methods relying on higher-order moments are considered…

We study the fate of internal gravity waves, which are excited by tidal forcing by a short-period planet at the interface of convection and radiation zones, approaching the centre of a solar-type star. We study at what amplitude these wave…

地球与行星天体物理 · 物理学 2015-05-18 A. J. Barker , G. I. Ogilvie