Results 21 to 30 of about 151,165 (141)

Mechanical heating in stellar chromospheres using the sun as a test case [PDF]

, 1973
The shock dissipation hypothesis for solar atmospheric heating is extended to stellar chromospheres of late type stars which have significant convective envelopes. Principle wave modes are studied for their generation, propagation, and heating properties
Jordan, S. D.
core  

The effect of stellar contamination on low-resolution transmission spectroscopy: needs identified by NASA’s Exoplanet Exploration Program Study Analysis Group 21 [PDF]

, 2023
Study Analysis Group 21 (SAG21) of NASA’s Exoplanet Exploration Program Analysis Group was organized to study the effect of stellar contamination on space-based transmission spectroscopy, a method for studying exoplanetary atmospheres by measuring the ...
Veselin Kostov, Barclay, T, Scandariato, Gaetano, Ludmila Carone, Newton, Elisabeth R, Greg Kopp, Davenport, James R A, Davenport, James R. A., Nadiia M Kostogryz, Dong, Chuanfei, James R A Davenport, Apai, D, Adriana Valio, Helen Giles, Drake Deming, Kostov, V, Carone, Ludmila, Giampapa, MS, Krivova, N, Wedemeyer, Sven, Heather M Cegla, Damien Fournier, López-Morales, M, Apai, Dániel, Solanki, S, Shapiro, Alexander I, Močnik, Teo, Močnik, T, Quintana, Elisa V, Montet, Benjamin T, Oskar Steiner, Panja, Mayukh, Emily Gilbert, Heidi Korhonen, Elisabeth R Newton, Sven Wedemeyer, Cegla, Heather M., Newton, Elisabeth R., Alexander I Shapiro, Deming, D, Zellem, Robert T., Espinoza, Néstor, Mallonn, M, Kevin Reardon, Rachael M Roettenbacher, Zellem, RT, Tregloan-Reed, Jeremy, Morris, Brett M, Rishi R Paudel, Wedemeyer, S, Kopp, Greg, Giles, Helen, Ribas, Ignasi, McGruder, Chima, MacDonald, RJ, Jie Yu, Montet, BT ; https://orcid.org/, Ribas, I, Luis Welbanks, Mullally, Susan, Criscuoli, S, Jeff A Valenti, MacDonald, Ryan J., Barstow, Joanna K, Fournier, Damien, Casewell, Sarah L., Kostogryz, Nadiia M., Brett M Morris, Thomas Barclay, Alam, MK, Fisher, C, Catherine Fischer, Sarah Peacock, Zellem, Robert T, Roettenbacher, Rachael M, Giovanni Bruno, Susan Mullally, Matthias Mallonn, Peacock, S, Kevin B Stevenson, Quintana, EV, Cegla, HM, Casewell, Sarah L, Sami Solanki, Morris, BM, Bruno, Giovanni, Elsa Ducrot, Quintana, Elisa V., Criscuoli, Serena, Karan Molaverdikhani, Montet, Benjamin T., Oshagh, M, Oshagh, Mahmoudreza, Krivova, Natalie, Kostogryz, NM, Molaverdikhani, K, Benjamin V Rackham, Fischer, C, Stassun, Keivan G., Sarah L Casewell, Gilbert, E, Dániel Apai, Line, Mike, Stassun, KG, Fischer, Catherine, Mullally, S, Stassun, Keivan G, Mallonn, Matthias, Line, M, Unruh, Yvonne C., Chima McGruder, MacDonald, Ryan J, Mercedes López-Morales, Chloe Fisher, Yu, Jie, Casewell, SL, Valio, A, Paudel, RR, Keivan G Stassun, Néstor Espinoza, Giampapa, Mark S., Mayukh Panja, Stevenson, KB, Peacock, Sarah, Munazza K Alam, Stevenson, Kevin B, Panja, M, Molaverdikhani, Karan, Davenport, JRA, Rackham, BV, Ducrot, Elsa, Tregloan-Reed, J, Unruh, Yvonne C, Roettenbacher, Rachael M., Cegla, Heather M, Rackham, Benjamin V., Barclay, Thomas, Paudel, Rishi R., Deming, Drake, Iyer, Aishwarya, Valenti, Jeff A., Fournier, D, Berdyugina, SV, Ryan J MacDonald, Bruno, G, Fisher, Chloe, Alam, Munazza K., Kopp, G, Korhonen, Heidi, Stevenson, Kevin B., Kostov, Veselin, Natalie Krivova, Korhonen, H, Giampapa, Mark S, Yu, J, Teo Močnik, Morris, Brett M., Alam, Munazza K, Ignasi Ribas, Steiner, O, Shapiro, AI, Giles, H, Carone, L, Joanna K Barstow, Berdyugina, Svetlana V., Valenti, JA, Ducrot, E, López-Morales, Mercedes, Serena Criscuoli, Elisa V Quintana, Scandariato, G, Newton, ER, Roettenbacher, RM, Mark S Giampapa, Espinoza, N, Robert T Zellem, Kostogryz, Nadiia M, Paudel, Rishi R, Gaetano Scandariato, Reardon, K, Welbanks, L, Mike Line, Steiner, Oskar, Valenti, Jeff A, Barstow, Joanna K., Solanki, Sami, Yvonne C Unruh, Rackham, Benjamin V, Gilbert, Emily, Welbanks, Luis, Shapiro, Alexander I., Aishwarya Iyer, Iyer, A, Unruh, YC, McGruder, C, Chuanfei Dong, Dong, C, Mahmoudreza Oshagh, Valio, Adriana, Berdyugina, Svetlana V, Reardon, Kevin, Svetlana V Berdyugina, Jeremy Tregloan-Reed, Benjamin T Montet, Barstow, JK   +204 more
core   +1 more source

Comparing Solar Structure Detection Methods in SDO/AIA Observations and the Application to Raw Uncalibrated Data

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Recent advances in solar physics increasingly rely on automated identification of coronal structures using machine learning. Yet most studies emphasize scientific performance without evaluating feasibility for onboard deployment to prioritize downlink observations.
P. Gonidakis, F. Carella, E. Dineva, H‐J. Jeong, P. Antunes, A. Podobas, S. Raptis, V. Toy‐Edens, M. Jin, S. Poedts, J. Magdalenic, G. Miloshevich   +11 more
wiley   +1 more source

Nonequilibrium Equation of State in Stellar Atmospheres

, 2021
In the stellar chromospheres, radiative energy transport is dominated by only the strongest spectral lines. For these lines, the approximation of local thermodynamic equilibrium (LTE) is known to be very inaccurate, and a state of equilibrium cannot be ...
Cameron, R., Anusha, L., van Noort, M., L. S. Anusha, M. van Noort, R. H. Cameron   +5 more
core   +1 more source

Magnetic Activity of TESS Objects Observed in the LAMOST Medium-resolution Spectral Survey

The Astrophysical Journal Supplement Series
A combination of spectroscopic and photometric observations provides an excellent data sample for studying stellar chromospheric activity. We have combined LAMOST medium-resolution spectra with TESS 2 minute light curves and extracted over 530,000 ...
Tianhao Su, Li-yun Zhang, Prabhakar Misra, Xianming L. Han, Yinpeng Wang, Wenjie Li, Zhongzhong Zhu, Qingfeng Pi, Hongpeng Lu   +8 more
doaj   +1 more source

Advancing Heliophysics and Space Weather Modeling Through Open Science

Space Weather, Volume 24, Issue 6, June 2026.
Abstract We present a community‐wide effort to develop a strategy and action plan to advance heliophysics and space weather modeling through open science. While open science has the potential to enhance the quality and pace of scientific discovery, its application to scientific modeling requires more careful consideration regarding open data and open ...
C. Corti, M. M. Kuznetsova, M. A. Reiss, J. Yue, J. Karpen, C. N. Arge, F. Bacchini, C. Bard, S. Bruinsma, R. M. Caplan, L. K. S. Daldorff, P. J. Deka, C. R. DeVore, S. Elvidge, N. Ganushkina, J. D. Huba, B. V. Jackson, V. Jordanova, J. A. Linker, H. Liu, J. G. Luhmann, S. Markidis, P. Mayank, V. Merkin, N. Moens, D. Odstrcil, Y. A. Omelchenko, M. Palmroth, S. Poedts, A. J. Ridley, Y. Shou, V. Tenishev, D. R. Themens, G. Toth, W. Wang, R.‐P. Wilhelm, M. A. Young, B. Cecconi, M.‐Y. Chou, D. De Zeeuw, G. L. Delzanno, C. Didigu, M. El Alaoui, S. Fung, J. Green, Z. Huang, L. K. Jian, L. J. Landwer, M. Lesko, P. MacNeice, A. Masson, M. L. Mays, P. M. Mehta, M. S. Miesch, E. Palmerio, M. Petrenko, E. Provornikova, L. Rastätter, L. Rusaitis, N. Sachdeva, E. Samara, D. Sur, A. Taktakishvili, J. Topper, T. Tsui, C. Verbeke, J. Wang, C. Wiegand, M. Wiltberger, Y. Zheng, M. M. Bisi, M. K. Georgoulis, T. Kodikara, T. Pulkkinen, A. Chartier, D. da Silva, A. Faturahman, K. Garcia‐Sage, D. Kondrashov, V. E. Ledvina, W. Liu, C. Pandey, E. Resnick, C. Shi, R. S. Weigel, K. Whitman, I. Zakharenkova, K. Zhang   +87 more
wiley   +1 more source

Evidence for stellar chromospheres presented by ground based spectra of the sun and stars [PDF]

, 1973
Direct observational evidence of stellar chromospheres is provided by H and K lines and their relationships to mass flux, mechanical dissipation and magnetic fields.
Praderie, F.
core  

The California Legacy Survey. VI. The Fate of Activity Cycles in Sun-like Stars

The Astronomical Journal
We analyze the spectra of 91 solar-type G- and K-type main-sequence dwarfs in the solar neighborhood to assess activity trends with stellar properties.
Howard Isaacson, Stephen R. Kane, Brad Carter, Andrew W. Howard   +3 more
doaj   +1 more source

Spectral Irradiance Observations and Projections for Solar Cycle 25

Earth and Space Science, Volume 13, Issue 4, April 2026.
Abstract The Ozone Monitoring Instrument (OMI) on the Aura satellite makes near‐daily measurements of solar spectral irradiance (SSI) at wavelengths between 265 and 500 nm for instrument calibration purposes. The low degradation and exceptional stability of OMI's calibration during its lifetime facilitates the creation of a new 18‐year OMI Version 7 ...
Matthew T. DeLand, Sergey V. Marchenko, Judith L. Lean, Odele Coddington   +3 more
wiley   +1 more source

Chromospheric activity and stellar evolution [PDF]

, 1973
A study of stellar chromospheres based on the internal structure of particular stars is presented. Used are complex flow diagrams of the linkage paths between mass loss, angular momentum loss, magnetic field from the turbulent dynamo and its relations to
Kippenhahn, R.
core