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We exploit the high spatial resolution and high cadence of the Interface Region Imaging Spectrograph (IRIS) to investigate the response of the transition region and chromosphere to energy deposition during a small flare. Simultaneous…

太阳与恒星天体物理 · 物理学 2016-09-28 Harry P. Warren , Jeffrey W. Reep , Nicholas A. Crump , Paulo J. A. Simoes

We consider a semi-infinite dielectric with multiple spatially dispersive resonances in the susceptibility. The effect of the boundary is described by an arbitrary reflection coefficient for polarization waves in the material at the…

光学 · 物理学 2017-05-10 R. J. Churchill , T. G. Philbin

The detection of a HeII absorption trough in the spectra of three high-redshift quasars provides new constraints on the spectral shape of the UV extragalactic background. The relative strengths of the observed flux decrements at the…

天体物理学 · 物理学 2007-05-23 Francesco Haardt , Piero Madau

We present a comprehensive analytical study of radiative transfer using the method of moments and include the effects of non-isotropic scattering in the coherent limit. Within this unified formalism, we derive the governing equations and…

地球与行星天体物理 · 物理学 2015-06-19 Kevin Heng , João M. Mendonça , Jae-Min Lee

We revisit here how Raman spectroscopy can be used to estimate the H content in hard hydrogenated amorphous carbon layers. The H content was varied from 2 at.% to 30 at.%, using heat treatments of a a-C:H, from room temperature to 1300 K…

材料科学 · 物理学 2013-08-22 Cedric Pardanaud , C. Martin , P. Roubin , G. Giacometti , C. Hopf , T. Schwarz-Selinger , W. Jacob

The electric permittivity and magnetic permeability for the quark-gluon plasma (QGP) is calculated within the hard-thermal-loop (HTL) perturbation theory. The refractive indices in the magnetizable and non-magnetizable plasmas are…

高能物理 - 唯象学 · 物理学 2011-12-21 Juan Liu , M. J. Luo , Qun Wang , Hao-jie Xu

With high-resolution infrared data becoming available that can probe the formation of high-mass stellar clusters for the first time, models that make testable predictions of these objects are necessary. We utilize a three-dimensional…

宇宙学与河外天体物理 · 物理学 2015-05-27 David G. Whelan , Kelsey E. Johnson , Barbara A. Whitney , Remy Indebetouw , Kenneth Wood

Near-Infrared spectra of Jupiter's South Equatorial Belt (SEB) with AAT/IRIS2 in H and K bands at a resolving power of R~2400 have been obtained. By creating line-by-line radiative transfer models with the latest improved spectral line data…

地球与行星天体物理 · 物理学 2021-07-26 Behrooz Karamiqucham , Jeremy A. Bailey , Lucyna Kedziora-Chudczer , Daniel V. Cotton

A universal theoretical model is proposed that explains the observed shift of IR absorption and emission bands in the spectra of transition metal ions in solid solutions of semiconductor compounds. The model has been used for estimating the…

材料科学 · 物理学 2022-01-05 S. V. Naydenov

We have measured the dayside spectrum of HD 189733b between 1.5 and 2.5 microns using the NICMOS instrument on the Hubble Space Telescope. The emergent spectrum contains significant modulation, which we attribute to the presence of…

天体物理学 · 物理学 2008-12-11 M. R. Swain , G. Vasisht , G. Tinetti , J. Bouwman , Pin Chen , Y. Yung , D. Deming , P. Deroo

We present an analytic formulation to model the fluctuating component of the HI signal from the epoch of reionization during the phase of partial heating. During this phase, we assume self-ionized regions, whose size distribution can be…

宇宙学与河外天体物理 · 物理学 2018-06-14 Janakee Raste , Shiv Sethi

We compare high resolution infrared observations of the CO 3-1 bands in the 2.297-2.310 micron region of M dwarfs and one L dwarf with theoretical expectations. We find a good match between the observational and synthetic spectra throughout…

In this paper, we have presented an analytical solution to extract the effective properties of acoustic metamaterials from the measured complex transmission and reflection coefficients when the metamaterial and impedance tube have different…

声音 · 计算机科学 2024-06-19 Mohammad Javad Khodaei , Amin Mehrvarz , Reza Ghaffarivardavagh , Nader Jalili

The near-infrared background between 0.5 $\mu$m to 2 $\mu$m contains a wealth of information related to radiative processes in the universe. Infrared background anisotropies encode the redshift-weighted total emission over cosmic history,…

宇宙学与河外天体物理 · 物理学 2019-04-24 Chang Feng , Asantha Cooray , Jamie Bock , Tzu-Ching Chang , Olivier Doré , Mario G. Santos , Marta B. Silva , Michael Zemcov

WMAP data when combined with ancillary data on free-free, synchrotron and dust allow an improved understanding of the spectrum of emission from each of these components. Here we examine the sky variation at intermediate and high latitudes…

宇宙学与河外天体物理 · 物理学 2013-09-27 Tuhin Ghosh , A. J. Banday , Tess Jaffe , Clive Dickinson , Rod Davies , Richard Davis , Krzysztof Gorski

To create self-controlled radiation photonics systems, it is necessary to have complete information about the nonlinear properties of the materials used. In this paper, the vibrational mechanism of the giant low-inertia cubic nonlinearity…

The theory of the thin vapor layers linear optical properties is presented for the case of specular reflection of atoms colliding with the walls. The effects of light absorption and the shift in the resonance frequency are taken into…

光学 · 物理学 2020-05-27 A. V. Ermolaev , T. A. Vartanyan

Protonated water clusters are a common species of atmospheric molecular cluster-ion, produced by cosmic rays throughout the troposphere and stratosphere. Under clear-sky conditions or periods of increased atmospheric ionisation, such as…

大气与海洋物理 · 物理学 2007-05-23 K. L. Aplin , R. A. McPheat

Both the quality and amount of astrophysical data are steadily increasing over time owing to the improvement of telescopes and their instruments. This requires corresponding evolution of the techniques used for obtaining and analyzing the…

太阳与恒星天体物理 · 物理学 2021-04-14 J. C. Trelles Arjona , B. Ruiz Cobo , M. J. Martínez González

First, we make a revision of the up-to-date Passive Scalar Fields properties: also, the refractive index is among them. Afterwards, we formulated the properties that make the family of `isotropic' fractional Brownian motion (with parameter…

光学 · 物理学 2007-05-23 Dario G. Perez