Browsing Institutt for teoretisk astrofysikk by Title

Now showing items 137-156 of 1278

  • Chemical enrichment of stars due to accretion from the ISM during the Galaxy's assembly 
    Shen, Sijing; Kulkarni, Girish; Madau, Piero; Mayer, Lucio (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Using the Eris zoom-in cosmological simulation of assembly of a Milky Way analogue, we study the chemical enrichment of stars due to accretion of metal-enriched gas from the interstellar medium (ISM) during the Galaxy's ...
  • Chromospheric and coronal heating in an active region plage by dissipation of currents from braiding 
    Bose, Souvik; De Pontieu, Bart Walter; Hansteen, Viggo Haraldson; Sainz Dalda, Alberto; Savage, Sabrina; Winebarger, Amy (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    Abstract The question of what heats the outer solar atmosphere remains one of the longstanding mysteries in astrophysics. Statistical studies of Sun-like stars reveal a correlation between global chromospheric and coronal ...
  • Chromospheric counterparts of solar transition region unresolved fine structure loops 
    Mendes Domingos Pereira, Tiago; Rouppe van der Voort, Luc; Hansteen, Viggo; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Low-lying loops have been discovered at the solar limb in transition region temperatures by the Interface Region Imaging Spectrograph (IRIS). They do not appear to reach coronal temperatures, and it has been suggested that ...
  • Chromospheric emission from nanoflare heating in RADYN simulations 
    Bakke, Helle; Carlsson, Mats; Rouppe van der Voort, Luc; Gudiksen, Boris Vilhelm; Polito, V.; Testa, Paola; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Context. Heating signatures from small-scale magnetic reconnection events in the solar atmosphere have proven to be difficult to detect through observations. Numerical models that reproduce flaring conditions are essential ...
  • Chromospheric evaporation and phase mixing of Alfvén waves in coronal loops 
    Van Damme, H. J.; de Moortel, Ineke; Pagano, P.; Johnston, Craig D. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Phase mixing of Alfvén waves has been studied extensively as a possible coronal heating mechanism but without the full thermodynamic consequences considered self-consistently. It has been argued that in some cases, ...
  • Chromospheric Heating by Magnetohydrodynamic Waves and Instabilities 
    Srivastava, Abhishek Kumar; Ballester, Jose Luis; Cally, Paul Stuart; Carlsson, Mats; Goossens, M.; Jess, David B.; Khomenko, Elena; Mathioudakis, Mihalis; Murawski, Kris; Zaqarashvili, Teimuraz (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    The importance of the chromosphere in the mass and energy transport within the solar atmosphere is now widely recognized. This review discusses the physics of magnetohydrodynamic waves and instabilities in large-scale ...
  • Chromospheric Heating due to Cancellation of Quiet Sun Internetwork Fields 
    Gošić, Milan; de la Cruz Rodriguez, Jaime; De Pontieu, Bart Walter; Bellot Rubio, L. R.; Carlsson, Mats; Esteban Pozuelo, S.; Ortiz, Ada; Polito, Vanessa (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The heating of the solar chromosphere remains one of the most important questions in solar physics. Our current understanding is that small-scale internetwork (IN) magnetic fields play an important role as a heating agent. ...
  • Chromospheric heating during flux emergence in the solar atmosphere 
    Leenarts, Jorrit; de la Cruz Rodriguez, Jaime; Danilovic, Sanja; Scharmer, Göran B.; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Context: The radiative losses in the solar chromosphere vary from 4 kW m−2 in the quiet Sun, to 20 kW m−2 in active regions. The mechanisms that transport non-thermal energy to and deposit it in the chromosphere are still ...
  • Chromospheric Heating from Local Magnetic Growth and Ambipolar Diffusion under Nonequilibrium Conditions 
    Martinez-Sykora, Juan; de la Cruz Rodriguez, Jaime; Gošić, Milan; Sainz Dalda, Alberto; Hansteen, Viggo Haraldson; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Abstract The heating of the chromosphere in internetwork regions remains one of the foremost open questions in solar physics. In the present study, we tackle this old problem by using a very-high-spatial-resolution ...
  • Chromospheric Inversions of a Micro-flaring Region 
    Reid, A.; de Jorge Henriques, Vasco Manuel; Mathioudakis, M.; Doyle, J. G.; Ray, T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We use spectropolarimetric observations of the Ca ii 8542 Å line, taken from the Swedish 1 m Solar Telescope, in an attempt to recover dynamic activity in a micro-flaring region near a sunspot via inversions. These inversions ...
  • Chromospheric Microjets in the Penumbra of a Sunspot 
    Drews, Ainar (Master thesis / Masteroppgave, 2014)
    In this thesis chromospheric features called Penumbral Microjets (PMJs) are investigated in a sunspot. Observations of high resolution in space, time and wavelength from the Swedish 1-meter Solar Telescope (SST) are used ...
  • Chromospheric plasma ejection above a pore 
    Bharti, L.; Sobha, B.; Quintero Noda, Carlos; Joshi, C.; Pandya, U. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    ABSTRACT We present high spatial resolution observations of short-lived transients, ribbons and jet-like events above a pore in Ca ii H images where fine structure, like umbral dots, light bridges and penumbral ...
  • Chromospheric polarimetry through multiline observations of the 850-nm spectral region 
    Quintero Noda, C.; Shimizu, T.; Katsukawa, Y.; de la Cruz Rodriguez, Jaime; Carlsson, Mats; Anan, T.; Oba, T.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Future solar missions and ground-based telescopes aim to understand the magnetism of the solar chromosphere. We performed a supporting study in Quintero Noda et al. focused on the infrared Ca ii 8542 Å line and we concluded ...
  • Chromospheric polarimetry through multiline observations of the 850-nm spectral region – II. A magnetic flux tube scenario 
    Quintero Noda, C.; Kato, Yoshiaki; Katsukawa, Y.; Oba, T.; de la Cruz Rodriguez, Jaime; Carlsson, Mats; Shimizu, T.; Orozco Suarez, D.; Ruiz Cobo, B.; Kubo, M.; Anan, T.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Future solar missions and ground-based telescopes aim to understand the magnetism of the solar chromosphere. We performed a supporting study in Quintero Noda et al. focused on the infrared Ca ii 8542 Å line and we concluded ...
  • Chromospheric polarimetry through multiline observations of the 850 nm spectral region III: Chromospheric jets driven by twisted magnetic fields 
    Quintero Noda, Carlos; Iijima, H.; Katsukawa, Y.; Shimizu, T.; Carlsson, Mats; de la Cruz Rodriguez, Jaime; Ruiz Cobo, B.; Orozco Suarez, D.; Oba, T.; Anan, T.; Kubo, M.; Kawabata, Y.; Ichimoto, K.; Suematsu, Y. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    We investigate the diagnostic potential of the spectral lines at 850 nm for understanding the magnetism of the lower atmosphere. For that purpose, we use a newly developed 3D simulation of a chromospheric jet to check the ...
  • A chromospheric resonance cavity in a sunspot mapped with seismology 
    Jess, David B.; Snow, Ben; Houston, Scott J.; Bortha, Gert J. J.; Fleck, Bernhard; Prasad, S. Krishna; Asensio Ramos, Andres; Morton, Richard J.; Keys, Peter H.; Jafarzadeh, Shahin; Stangalini, Marco; Grant, Samuel D. T.; Christian, Damian J. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Sunspots are intense collections of magnetic fields that pierce through the Sun’s photosphere, with their signatures extending upwards into the outermost extremities of the solar corona1. Cutting-edge observations and ...
  • Chromospheric thermodynamic conditions from inversions of complex Mg II h & k profiles observed in flares 
    Sainz Dalda, Alberto; De Pontieu, Bart Walter (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    The flare activity of the Sun has been studied for decades, using both space- and ground-based telescopes. The former have mainly focused on the corona, while the latter have mostly been used to investigate the conditions ...
  • CLASP Constraints on the Magnetization and Geometrical Complexity of the Chromosphere-Corona Transition Region 
    Trujillo Bueno, Javier; Stepan, Jiri; Belluzzi, Luca; Asensio Ramos, Andrés; Manso Sainz, Manso; del Pino Alemán, T.; Casini, Roberto; Ishikawa, Ryohko; Kano, Ryouhei; Winebarger, Amy R.; Auchère, Frédéric; Narukage, Noriyuki; Kobayashi, Ken; Bando, Takamasa; Katsukawa, Yukio; Kubo, Masahito; Ishikawa, Shin'nosuke; Giono, Gabriel; Hara, Hirohisa; Suematsu, Yoshinori; Shimizu, Toshifumi; Sakao, Taro; Tsuneta, Saku; Ichimoto, Kiyoshi; Cirtain, Jonathan W.; Champey, Patrick R.; De Pontieu, Bart Walter; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) is a suborbital rocket experiment that on 2015 September 3 measured the linear polarization produced by scattering processes in the hydrogen Lyα line of the solar ...
  • CLASS Angular Power Spectra and Map-component Analysis for 40 GHz Observations through 2022 
    Eimer, Joseph R.; Li, Yunyang; Brewer, Michael K.; Shi, Rui; Ali, Aamir; Appel, John W.; Bennett, Charles L.; Bruno, Sarah Marie; Bustos, Ricardo; Chuss, David T.; Cleary, Joseph; Dahal, Sumit; Datta, Rahul; Denes Couto, Jullianna; Denis, Kevin L.; Dünner, Rolando; Essinger-Hileman, Thomas; Fluxá, Pedro; Hubmayer, Johannes; Harrington, Kathleen; Iuliano, Jeffrey; Karakla, John; Marriage, Tobias A.; Núñez, Carolina; Parker, Lucas; Petroff, Matthew A.; Reeves, Rodrigo A.; Rostem, Karwan; Valle, Deniz A. N.; Watts, Duncan; Weiland, Janet L.; Wollack, Edward J.; Xu, Zhilei; Zeng, Lingzhen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
  • CLASS Data Pipeline and Maps for 40 GHz Observations through 2022 
    Li, Yunyang; Eimer, Joseph R.; Osumi, Keisuke; Appel, John W.; Brewer, Michael K.; Ali, Aamir; Bennett, Charles L.; Bruno, Sarah Marie; Bustos, Ricardo; Chuss, David T.; Cleary, Joseph; Couto, Jullianna Denes; Dahal, Sumit; Datta, Rahul; Denis, Kevin L.; Dünner, Rolando; Espinoza, Francisco; Essinger-Hileman, Thomas; Fluxá Rojas, Pedro; Harrington, Kathleen; Iuliano, Jeffrey; Karakla, John; Marriage, Tobias A.; Miller, Nathan J.; Novack, Sasha; Núñez, Carolina; Petroff, Matthew A.; Reeves, Rodrigo A.; Rostem, Karwan; Shi, Rui; Valle, Deniz A. N.; Watts, Duncan; Weiland, Janet L.; Wollack, Edward J.; Xu, Zhilei; Zeng, Lingzhen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)