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Exploiting high-resolution observations made by the Solar Optical Telescope onboard Hinode, we investigate the spatial distribution of power spectral density of oscillatory signal in and around NOAA active region 10935. The G-band data show…

The chromosphere in internetwork regions of the quiet Sun was regarded as a static and homogeneous layer for a long time. Thanks to advances in observations and numerical modelling, the wave nature of these atmospheric regions received…

Astrophysics · Physics 2015-06-24 Sven Wedemeyer-Böhm

Our observations of the quiet Sun with the NST have yielded unanticipated results on smal-scale solar dynamic. Althought small-scale solar dynamic have been well-studied, the NST is enabling us to probe finer scale dynamic exploiting higher…

Solar and Stellar Astrophysics · Physics 2009-12-23 Aleksandra Andic

Magnetic Bright Points (MBPs) in the internetwork are among the smallest objects in the solar photosphere and appear bright against the ambient environment. An algorithm is presented that can be used for the automated detection of the MBPs…

Solar and Stellar Astrophysics · Physics 2015-05-13 P. J. Crockett , D. B. Jess , M. Mathioudakis , F. P. Keenan

Context. Magnetic bright points (MBPs) are one of the smallest manifestations of the magnetic field in the solar atmosphere and are observed to extend from the photosphere up to the chromosphere. As such, they represent an excellent feature…

Solar and Stellar Astrophysics · Physics 2024-09-19 Arthur Berberyan , Peter H. Keys , David B. Jess , Damian J. Christian

Various bright structures abound in the chromosphere playing an essential role in the dynamics and evolution therein. Tentatively identifying the wave characteristics in the outer solar atmosphere helps to understand this layer better. One…

Solar and Stellar Astrophysics · Physics 2022-10-26 Rayhane Sadeghi , Ehsan Tavabi

The sub-arcsec bright points (BP) associated with the small scale magnetic fields in the lower solar atmosphere are advected by the evolution of the photospheric granules. We measure various quantities related to the horizontal motions of…

Solar and Stellar Astrophysics · Physics 2012-05-28 LP. Chitta , A. A. van Ballegooijen , L. Rouppe van der Voort , E. E. DeLuca , R. Kariyappa

The connectivity pattern of networks, which are based on a correlation between ground level temperature time series, shows a dominant dense stripe of links in the southern ocean. We show that statistical categorization of these links yields…

Atmospheric and Oceanic Physics · Physics 2015-06-15 Yang Wang , Avi Gozolchiani , Yosef Ashkenazy , Yehiel Berezin , Oded Guez , Shlomo Havlin

A solar X-ray Bright point (BP) was observed with the SUMER-spectrograph of the SOHO-observatory. The data consist of four far-UV spectral lines formed between 2 10^4 - 6 10^5 K, with 2 arcsec spatial, 2.8 min temporal and 4 km/s spectral…

Astrophysics · Physics 2009-11-07 O. Vilhu , J. Huovelin , S. Pohjolainen , J. Virtanen , W. Curdt

The high spatial and time resolution data obtained with SDO/AIA for the sunspot in active region NOAA 11131 on 08 December 2010 were analysed with the time-distance plot technique and the pixelised wavelet filtering method. Oscillations in…

Solar and Stellar Astrophysics · Physics 2014-09-17 R. Sych , V. M. Nakariakov

The integration of non-terrestrial networks (NTNs), which include high altitude platform (HAP) stations and intelligent reflecting surfaces (IRS) into communication infrastructures has become a crucial area of research to address the…

Numerical Analysis · Mathematics 2025-11-04 Shunyuan Shang , Emna Zedini , Mohamed-Slim Alouini

This paper investigates the distribution of linear polarization signals in the quiet Sun internetwork using ultra-deep spectropolarimetric data. We reduce the noise of the observations as much as is feasible by adding single-slit…

Solar and Stellar Astrophysics · Physics 2012-09-04 L. R. Bellot Rubio , D. Orozco Suárez

The aim of this work is to study the structure of the magnetic field vector in the internetwork and search for the presence of small-scale loops. We invert 1.56 micron spectropolarimetric observations of internetwork regions at disc centre…

Astrophysics · Physics 2009-11-13 M. J. Martinez Gonzalez , M. Collados , B. Ruiz Cobo , S. K. Solanki

Internetwork (IN) magnetic fields are highly dynamic, short-lived magnetic structures that populate the interior of supergranular cells. Since they emerge all over the Sun, these small-scale fields bring a substantial amount of flux, and…

Solar and Stellar Astrophysics · Physics 2021-04-21 Milan Gošić , Bart De Pontieu , Luis R. Bellot Rubio , Alberto Sainz Dalda , Sara Esteban Pozuelo

Aims. With the Solar Optical Telescope on Hinode, we investigate the basic properties of high-degree solar oscillations observed at two levels in the solar atmosphere, in the G-band (formed in the photosphere) and in the Ca II H line…

Astrophysics · Physics 2009-11-13 U. Mitra-Kraev , A. G. Kosovichev , T. Sekii

A large solar pore with a granular light bridge was observed on October 15, 2008 with the IBIS spectrometer at the Dunn Solar Telescope and a 69-min long time series of spectral scans in the lines Ca II 854.2 nm and Fe I 617.3 nm was…

Solar and Stellar Astrophysics · Physics 2015-06-15 M. Sobotka , M. Svanda , J. Jurcak , P. Heinzel , D. Del Moro

Solar inter-network magnetic field is the weakest component of solar magnetism, but contributes most of the solar surface magnetic flux. The study on its origin has been constrained by the inadequate tempo-spatial resolution and sensitivity…

Solar and Stellar Astrophysics · Physics 2015-05-26 Chunlan Jin , Jingxiu Wang

We study the propagation of waves from the photosphere to the chromosphere of sunspots. From time series of cospatial Ca II H (including its line blends) intensity spectra and polarimetric spectra of Si I 1082.7 nm and He I 1083.0 nm we…

Solar and Stellar Astrophysics · Physics 2015-05-20 T. Felipe , E. Khomenko , M. Collados , C. Beck

Small-scale internetwork magnetic fields are important ingredients of the quiet Sun. In this paper we analyze how they appear and disappear on the solar surface. Using high resolution Hinode magnetograms, we follow the evolution of…

Solar and Stellar Astrophysics · Physics 2016-04-08 Milan Gošić , Luis R. Bellot Rubio , Jose Carlos Del Toro Iniesta , David Orozco Suárez , Yukio Katsukawa

Small-scale internetwork (IN) magnetic fields are considered to be the main building blocks of the quiet Sun magnetism. For this reason, it is crucial to understand how they appear on the solar surface. Here, we employ a high-resolution,…