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Using a method based on normalized monthly variation rate, we studied resistivity data of seven observation stations before the events in the epicenter areas of two strong earthquakes. The relationship between variation of anisotropic…

Geophysics · Physics 2025-01-20 Jianguo Zhang , Wei Du , Mingxin Yue , Chenghui Liu , Xiaolong Liang , Jun Yang

As a star spins-down during the main sequence, its wind properties are affected. In this work, we investigate how the Earth's magnetosphere has responded to the change in the solar wind. Earth's magnetosphere is simulated using 3D…

Earth and Planetary Astrophysics · Physics 2019-09-25 S. Carolan , A. A. Vidotto , C. Loesch , P. Coogan

We have studied the angular distribution of the magnetic field vector in the solar internetwork employing high-quality data (noise level $\sigma \approx 3\times 10^{-4}$ in units of the quiet-Sun intensity) at different latitudes recorded…

Solar and Stellar Astrophysics · Physics 2015-06-12 J. M. Borrero , P. Kobel

We address the thermal history of the Earth after the Moon-forming impact, taking tidal heating and thermal blanketing by the atmosphere into account. The atmosphere sets an upper bound of ~100 W/m^2 on how quickly the Earth can cool. The…

Earth and Planetary Astrophysics · Physics 2015-08-07 Kevin J. Zahnle , Roxana Lupu , Anthony Dobrovolskis , Norman H. Sleep

We have studied how the energy spectrum of muons at production affects some of the most common measurements related to muons in extensive air shower studies, namely, the number of muons at the ground, the slope of the lateral distribution…

High Energy Physics - Phenomenology · Physics 2016-11-28 J. Espadanal , L. Cazon , R. Conceição

Using the geomagnetic storm of July 15, 2000 as an example, we investigated the dependence of GPS navigation system performance on the nightside at mid-latitudes on the level of geomagnetic disturbance. The investigation was based on the…

Magnetically-driven hotspot variations (which are tied to atmospheric wind variations) in hot Jupiters are studied using non-linear numerical simulations of a shallow-water magnetohydrodynamic (SWMHD) system and a linear analysis of…

Earth and Planetary Astrophysics · Physics 2021-12-08 A. W. Hindle , P. J. Bushby , T. M. Rogers

In the in-out formalism we advance a method of the inverse scattering matrix for calculating effective actions in pure magnetic field backgrounds. The one-loop effective actions are found in a localized magnetic field of Sauter type and…

High Energy Physics - Theory · Physics 2015-05-30 Sang Pyo Kim

Slow magnetoacoustic waves (SMAWs) have been considered in the past as a possible candidate for chromospheric heating. This study analyzes 20 active regions observed between 2012 and 2016 to examine the amplitude and energy flux variation…

Solar and Stellar Astrophysics · Physics 2025-04-22 Y. Sanjay , S. Krishna Prasad , P. S. Rawat

Disorder induced by chemical inhomogeneity and Jahn-Teller (JT) distortions is often observed in mixed valence perovskite manganites. The main reasons for the evolution of this disorder are connected with the cationic size differences and…

Materials Science · Physics 2021-11-30 Sagar Ghorai , Sergey A. Ivanov , Ridha Skini , Petter Ström , Peter Svedlindh

We considered variations the dipole and the quadrupole components of the solar large-scale magnetic field. Both the axial and the equatorial dipoles exhibit a systematic decrease in the past four cycles in accordance with the general…

Solar and Stellar Astrophysics · Physics 2020-02-19 V. N. Obridko , D. D. Sokoloff , B. D. Shelting , A. S. Shibalova , I. M. Livshits

Maps of the magnetic field at the Sun's surface are commonly used as boundary conditions in space-weather modeling. However, continuous observations are only available from the Sun's Earth-facing side. One commonly used approach to mitigate…

Solar and Stellar Astrophysics · Physics 2024-12-02 Dan Yang , Stephan G. Heinemann , Robert H. Cameron , Laurent Gizon

We consider the effect of a random magnetic field in the convective zone of the Sun superimposed to a regular magnetic field on resonant neutrino spin-flavour oscillations. We argue for the existence of a field of strongly chaotic nature at…

High Energy Physics - Phenomenology · Physics 2009-10-31 V. B Semikoz , E. Torrente-Lujan

We present the initial results of an observational study into the variation of the dominant length-scale of quiet solar emission: supergranulation. This length-scale reflects the radiative energy in the plasma of the upper solar…

Solar and Stellar Astrophysics · Physics 2015-05-27 Scott W. McIntosh , Robert J. Leamon , Rachel A. Hock , Mark P. Rast , Roger K. Ulrich

Magnetic reconnection (MR) in Earth's magnetotail is usually followed by a systemwide redistribution of explosively released kinetic and thermal energy. Recently, multispacecraft observations from the THEMIS mission were used to study…

Earth and Planetary Astrophysics · Physics 2014-11-20 Z. Voros , M. P. Leubner , A. Runov , V. Angelopoulos , W. Baumjohann

There is increasingly strong observational evidence that slow magnetoacoustic modes arise in the solar atmosphere. Solar magneto-seismology is a novel tool to derive otherwise directly un-measurable properties of the solar atmosphere when…

Solar and Stellar Astrophysics · Physics 2015-06-04 M. Luna-Cardozo , G. Verth , R. Erdélyi

Context. There is no consensus on the amplitude of the historical solar forcing. The estimated magnitude of the total solar irradiance difference between Maunder minimum and present time ranges from 0.1 to 6 W/m2 making uncertain the…

Solar and Stellar Astrophysics · Physics 2018-07-18 T. Egorova , W. Schmutz , E. Rozanov , A. I. Shapiro , I. Usoskin , J. Beer , R. V. Tagirov , T. Peter

At time $t$ after an initial quench, an aging system responds to a perturbation turned on at time $ t_{\rm w} < t$ in a way mainly depending on the number of intermittent energy fluctuations, so-called quakes, which fall within the…

Statistical Mechanics · Physics 2009-09-29 Paolo Sibani , Simon Christiansen

We test the ability of large scale velocity fields inferred from geomagnetic secular variation data to produce the global magnetic field of the Earth.Our kinematic dynamo calculations use quasi-geostrophic (QG) flows inverted from…

Geophysics · Physics 2016-01-20 Nathanaël Schaeffer , Estelina Lora Silva , Maria Alexandra Pais

Magnetization (M) and magnetoresistance (MR) measurements on polycrystalline R2Mn3Si5 (R = Tb, Dy and Ho) compounds (tetragonal, space group P4/mnc) have been carried out in the temperature range of 2 K-300 K, in various applied fields.…

Materials Science · Physics 2009-11-11 R. Nirmala , S. K. Malik , A. V. Morozkin , Y. Yamamoto , H. Hori
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