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200 papers
Earlier studies using extreme-ultraviolet images and line-of-sight magnetograms from the Solar Dynamics Observatory (SDO) have suggested that active region (AR) plages and strong network concentrations often have small, looplike features…
Small-scale Flux Emergence, Coronal Hole Heating, and Flux-tube Expansion: A Hybrid Solar Wind Model
Extreme-ultraviolet images from the Solar Dynamics Observatory often show looplike fine structure to be present where no minority-polarity flux is visible in magnetograms, suggesting that the rate of ephemeral region (ER) emergence inside…
A theory for the heating of coronal magnetic flux ropes is developed. The dissipated magnetic energy has two distinct contributions: (1) energy injected into the corona as a result of granule-scale, random footpoint motions, and (2) energy…
Context. Photospheric motions shuffle the footpoints of the strong axial magnetic field that threads coronal loops giving rise to turbulent nonlinear dynamics characterized by the continuous formation and dissipation of field-aligned…
Solar and Stellar Astrophysics · Physics
2012-08-14
R. B. Dahlburg , G. Einaudi , A. F. Rappazzo , M. Velli
A recent study demonstrated that freedom of convection and strength of magnetic field in the photospheric feet of active-region (AR) coronal loops, together, can engender or quench heating in them. Other studies stress that magnetic flux…
Solar and Stellar Astrophysics · Physics
2021-02-23
Sanjiv K. Tiwari , Caroline L. Evans , Navdeep K. Panesar , Avijeet Prasad , Ronald L. Moore
The solar corona is much hotter than the photosphere and chromosphere, but the physical mechanism responsible for heating the coronal plasma remains unidentified yet. The thermal microwave emission, which is produced in strong magnetic…
Solar and Stellar Astrophysics · Physics
2025-08-27
Alexey A. Kuznetsov , Gregory D. Fleishman , Gelu M. Nita , Sergey A. Anfinogentov
We examine the hypothesis that multipolar magnetic fields advected by photospheric granules can contribute heating to the active chromosphere and corona. On 28 September 2020 the GRIS and HiFI+ instruments at the GREGOR telescope obtained…
Coronal loops trace out bipolar, arch-like magnetic fields above the Sun's surface. Recent measurements that combine rotational tomography, extreme ultraviolet imaging, and potential-field extrapolation have shown the existence of large…
We investigate the thermal, kinematic and magnetic structure of small-scale heating events in an emerging flux region (EFR). We use high-resolution multi-line observations (including Ca II 8542~\AA, Ca II K, and Fe I 6301~\AA line pair) of…
Solar and Stellar Astrophysics · Physics
2023-09-14
Rahul Yadav , Maria D. Kazachenko , Andrey N. Afanasyev , Jaime de la Cruz Rodríguez , Jorrit Leenaarts
Some models of coronal heating suppose that convective motions at the photosphere shuffle the footpoints of coronal magnetic fields and thereby inject sufficient magnetic energy upward to account for observed coronal and chromospheric…
In this study we report detailed observations of magnetic environment at four footpoints of two warm coronal loops observed on 5 May 2016 in NOAA AR 12542 (Loop I) and 17 Dec 2015 in NOAA AR 12470 (Loop II). These loops were connecting a…
Solar and Stellar Astrophysics · Physics
2019-03-29
Seray Şahin , Vasyl Yurchyshyn , Pankaj Kumar , Ali Kilcik , Kwangsu Ahn , Xu Yang
It has been proposed that the million degree temperature of the corona is due to the combined effect of barely-detectable energy releases, so called nanoflares, that occur throughout the solar atmosphere. Alas, the nanoflare density and…
Solar and Stellar Astrophysics · Physics
2015-05-27
M. R. Bareford , P. K. Browning , R. A. M. Van der Linden
The evolution of a coronal loop is studied by means of numerical simulations of the fully compressible three-dimensional magnetohydrodynamic equations using the HYPERION code. The footpoints of the loop magnetic field are advected by random…
Solar and Stellar Astrophysics · Physics
2016-01-22
R. B. Dahlburg , G. Einaudi , B. D. Taylor , I. Ugarte-Urra , H. P. Warren , A. F. Rappazzo , M. Velli
Flare frequency distributions represent a key approach to addressing one of the largest problems in solar and stellar physics: determining the mechanism that counter-intuitively heats coronae to temperatures that are orders of magnitude…
Solar and Stellar Astrophysics · Physics
2023-05-11
James Paul Mason , Alexandra Werth , Colin G. West , Allison A. Youngblood , Donald L. Woodraska , Courtney Peck , Kevin Lacjak , Florian G. Frick , Moutamen Gabir , Reema A. Alsinan , Thomas Jacobsen , Mohammad Alrubaie , Kayla M. Chizmar , Benjamin P. Lau , Lizbeth Montoya Dominguez , David Price , Dylan R. Butler , Connor J. Biron , Nikita Feoktistov , Kai Dewey , N. E. Loomis , Michal Bodzianowski , Connor Kuybus , Henry Dietrick , Aubrey M. Wolfe , Matt Guerrero , Jessica Vinson , Peter Starbuck , Shelby D Litton , M. G. Beck , Jean-Paul Fisch , Ayana West , Alexis A. Muniz , Luis Chavez , Zachary T. Upthegrove , Brenton M. Runyon , J. Salazar , Jake E. Kritzberg , Tyler Murrel , Ella Ho , Quintin Y. LaFemina , Sara I. Elbashir , Ethan C. Chang , Zachary A. Hudson , Rosemary O. Nussbaum , Kellen Kennedy , Kevin Kim , Camila Villamil Arango , Mohammed A. Albakr , Michael Rotter , A. J. Garscadden , Antonio Salcido-Alcontar , Harrison M. Pearl , Tyler Stepaniak , Josie A. Marquez , Lauren Marsh , Jesse C Andringa , Austin Osogwin , Amanda M. Shields , Sarah Brookins , Grace K. Hach , Alexis R. Clausi , Emily B. Millican , Alan A Jaimes , Alaina S. Graham , John J. Burritt , J. S. Perez , Nathaniel Ramirez , Rohan Suri , Michael S. Myer , Zoe M. Kresek , C. A. Goldsberry , Genevieve K. Payne , Tara Jourabchi , J. Hu , Jeffrey Lucca , Zitian Feng , Connor B. Gilpatrick , Ibraheem A. Khan , Keenan Warble , Joshua D. Sweeney , Philip Dorricott , Ethan Meyer , Yash S. Kothamdi , Arman S. Sohail , Kristyn Grell , Aidan Floyd , Titus Bard , Randi M. Mathieson , Joseph Reed , Alexis Cisneros , Matthew P. Payne , J. R. Jarriel , Jacqueline Rodriguez Mora , M. E. Sundell , Kajal Patel , Mohammad Alesmail , Yousef A Alnasrallah , Jumana T. Abdullah , Luis Molina-Saenz , K. E. Tayman , Gabriel T. Brown , Liana Kerr-Layton , Zachary D. Berriman-Rozen , Quinn Hiatt , Etash Kalra , Jason Ong , Shreenija Vadayar , Callie D. 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Ward-Chene , Emma Shelby , Brian D. Reagan , Toni Marsh , Sucheta Sarkar , Michael P. Kelley , Kevin Fell , Sahana Balaji , Annalise K. Hildebrand , Dominick Shoha , Kshmya Nandu , Julia Tucker , Alejandro R. Cancio , Jiawei Wang , Sarah Grace Rapaport , Aimee S. Maravi , Victoria A. Mayer , Andrew Miller , Caden Bence , Emily Koke , John T Fauntleroy , Timothy Doermer , Adel Al-Ghazwi , Remy Morgan , Mohammed S. Alahmed , Adam Izz Khan Mohd Reduan Mathavan , H. K. Silvester , Amanda M. Weiner , Nianzi Liu , Taro Iovan , Alexander V. Jensen , Yazeed A. AlHarbi , Yufan Jiang , Jiaqi Zhang , Olivia M. Jones , Chenqi Huang , Eileen N. Reh , Dania Alhamli , Joshua Pettine , Chongrui Zhou , Dylan Kriegman , Jianing Yang , Kevin Ash , Carl Savage , Emily Kaiser , Dakota N. Augenstein , Jacqueline Padilla , Ethan K. Stark , Joshua A. Hansen , Thomas Kokes , Leslie Huynh , Gustavo Sanchez-Sanchez , Luke A. Jeseritz , Emma L. Carillion , Aditya V. Vepa , Sapriya Khanal , Braden Behr , Logan S. 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Shockley , Justin Phillips , Madigan Rumley , Johnston Daboub , Brennan J. Karsh , Bridget Linders , Sam Chen , Helen C. Do , Abhinav Avula , James M. French , Chrisanna Bertuccio , Tyler Hand , Adrianna J. Lee , Brenna K Neeland , Violeta Salazar , Carter Andrew , Abby Barmore , Thomas Beatty , Nicholas Alonzi , Ryan Brown , Olivia M. Chandler , Curran Collier , Hayden Current , Megan E. Delasantos , Alberto Espinosa de los Monteros Bonilla , Alexandra A. Fowler , Julianne R. Geneser , Eleanor Gentry , E. R. Gustavsson , Jonathan Hansson , Tony Yunfei Hao , Robert N. Herrington , James Kelly , Teagan Kelly , Abigail Kennedy , Mathew J. Marquez , Stella Meillon , Madeleine L. Palmgren , Anneliese Pesce , Anurag Ranjan , Samuel M. Robertson , Percy Smith , Trevor J Smith , Daniel A. Soby , Grant L. Stratton , Quinn N. Thielmann , Malena C. Toups , Jenna S. Veta , Trenton J. Young , Blake Maly , Xander R. Manzanares , Joshua Beijer , Jacob D. George , Dylan P. Mills , Josh J Ziebold , Paige Chambers , Michael Montoya , Nathan M. Cheang , Hunter J. Anderson , Sheridan J. Duncan , Lauren Ehrlich , Nathan C. Hudson , Jack L. Kiechlin , Will Koch , Justin Lee , Dominic Menassa , S. H. Oakes , Audrey J. Petersen , J. R. Ramirez Bunsow , Joshua Bay , Sacha Ramirez , Logan D. Fenwick , Aidan P. Boyle , Lea Pearl Hibbard , Calder Haubrich , Daniel P. Sherry , Josh Jenkins , Sebastian Furney , Anjali A. Velamala , Davis J. Krueger , William N. Thompson , Jenisha Chhetri , Alexis Ying-Shan Lee , Mia G. V. Ray , John C. Recchia , Dylan Lengerich , Kyle Taulman , Andres C. Romero , Ellie N. Steward , Sloan Russell , Dillon F. Hardwick , Katelynn Wootten , Valerie A. Nguyen , Devon Quispe , Cameron Ragsdale , Isabel Young , N. S. Atchley-Rivers , Jordin L. Stribling , Julia G Gentile , Taylor A. Boeyink , Daniel Kwiatkowski , Tomi Oshima Dupeyron , Anastasia Crews , Mitchell Shuttleworth , Danielle C. Dresdner , Lydia Flackett , Nicholas Haratsaris , Morgan I Linger , Jay H. Misener , Samuel Patti , Tawanchai P. Pine , Nasreen Marikar , Giorgio Matessi , Allie C. Routledge , Suhail Alkaabi , Jessica L. Bartman , Gabrielle E. Bisacca , Celeste Busch , Bree Edwards , Caitlyn Staudenmier , Travis Starling , Caden McVey , Maximus Montano , Charles J. Contizano , Eleanor Taylor , James K. McIntyre , Andrew Victory , Glen S. McCammon , Aspen Kimlicko , Tucker Sheldrake , Grace Shelchuk , Ferin J. Von Reich , Andrew J. Hicks , Ian O'neill , Beth Rossman , Liam C. Taylor , William MacDonald , Simone E. Becker , Soonhee Han , Cian O'Sullivan , Isaac Wilcove , David J. Brennan , Luke C. Hanley , Owen Hull , Timothy R. Wilson , Madison H. Kalmus , Owen A. Berv , Logan Swous Harris , Chris H Doan , Nathan Londres , Anish Parulekar , Megan M. Adam , Abigail Angwin , Carter C. Cabbage , Zachary Colleran , Alex Pietras , Octave Seux , Ryan Oros , Blake C. Wilkinson , Khoa D Nguyen , Maedee Trank-Greene , Kevin M. Barone , G. L. Snyder , Samuel J Biehle , Brennen Billig , Justin Thomas Almquist , Alyssa M. Dixon , Benjamin Erickson , Nathan Evans , SL Genne , Christopher M Kelly , Serafima M. Marcus , Caleb Ogle , Akhil Patel , Evan Vendetti , Olivia Courtney , Sean Deel , Leonardo Del Foco , Michael Gjini , Jessica Haines , Isabelle J. Hoff , M. R. Jones , Dominic Killian , Kirsten Kuehl , Chrisanne Kuester , Maxwell B. Lantz , Christian J Lee , Graham Mauer , Finbar K. McKemey , Sarah J. Millican , Ryan Rosasco , T. C. Stewart , Eleanor VanEtten , Zachary Derwin , Lauren Serio , Molly G. Sickler , Cassidy A. Blake , Neil S. Patel , Margaret Fox , Michael J Gray , Lucas J. Ziegler , Aman Priyadarshi Kumar , Madelyn Polly , Sarah Mesgina , Zane McMorris , Kyle J. Griffin , L. N. Haile , Claire Bassel , Thomas J. Dixon , Ryan Beattie , Timothy J Houck , Maeve Rodgers , Tyson R. Trofino , Dax Lukianow , Korben Smart , Jacqueline L. Hall , Lauren Bone , James O. Baldwin , Connor Doane , Yousef A. Almohsen , Emily Stamos , Iker Acha , Jake Kim , Antonio E. Samour , S. Chavali , Jeerakit Kanokthippayakun , Nicholas Gotlib , Ryan C. Murphy , Jack. W. Archibald , Alexander J Brimhall , Aidan Boyer , Logan T. Chapman , Shivank Chadda , Lisa Sibrell , Mia M. Vallery , Thomas C. Conroy , Luke J. Pan , Brian Balajonda , Bethany E. S. Fuhrman , Mohamed Alkubaisi , Jacob Engelstad , Joshua Dodrill , Calvin R. Fuchs , Gigi Bullard-Connor , Isehaq Alhuseini , James C. Zygmunt , Leo Sipowicz , Griffin A. Hayrynen , Riley M. McGill , Caden J. Keating , Omer Hart , Aidan St. Cyr , Christopher H. Steinsberger , Gerig Thoman , Travis M. Wood , Julia A. Ingram , J. Dominguez , Nathaniel James Georgiades , Matthew Johnson , Sawyer Johnson , Alexander J. Pedersen , Anoush K Ralapanawe , Jeffrey J. Thomas , Ginn A. Sato , Hope Reynolds , Liebe Nasser , Alexander Z. Mizzi , Olivia Damgaard , Abdulrahman A. Baflah , Steven Y. Liu , Adam D. Salindeho , Kelso Norden , Emily E. Gearhart , Zack Krajnak , Philip Szeremeta , Meggan Amos , Kyungeun Shin , Brandon A. Muckenthaler , Melissa Medialdea , Simone Beach , Connor B. Wilson , Elena R Adams , Ahmed Aldhamen , Coyle M. Harris , Troy M. Hesse , Nathan T. Golding , Zachary Larter , Angel Hernandez , Genaro Morales , Robert B. Traxler , Meshal Alosaimi , Aidan F. Fitton , James Holland Aaron , Nathaniel F. Lee , Ryan Z. Liao , Judy Chen , Katherine V. French , Justin Loring , Aurora Colter , Rowan McConvey , Michael Colozzi , John D. Vann , Benjamin T. Scheck , Anthony A Weigand , Abdulelah Alhabeeb , Yolande Idoine , Aiden L. Woodard , Mateo M. Medellin , Nicholas O Ratajczyk , Darien P. Tobin , Jack C. Collins , Thomas M. Horning , Nick Pellatz , John Pitten , Noah Lordi , Alyx Patterson , Thi D Hoang , Ingrid H Zimmermann , Hongda Wang , Daniel Steckhahn , Arvind J. Aradhya , Kristin A. Oliver , Yijian Cai , Chaoran Wang , Nikolay Yegovtsev , Mengyu Wu , Koushik Ganesan , Andrew Osborne , Evan Wickenden , Josephine C. Meyer , David Chaparro , Aseem Visal , Haixin Liu , Thanmay S. Menon , Yan Jin , John Wilson , James W. Erikson , Zheng Luo , Nanako Shitara , Emma E Nelson , T. R. Geerdts , Jorge L Ramirez Ortiz , H. J. Lewandowski
One candidate-model for heating the solar corona is magnetic reconnection that embodies Ohmic dissipation of current sheets. When numerous small-scaled magnetic reconnection occur, then it is possible to heat the corona. Due to the…
We model nanoflare heating of extrapolated active-region coronal loops via the acceleration of electrons and protons in Harris-type current sheets. The kinetic energy of the accelerated particles is estimated using semi-analytical and…
Solar and Stellar Astrophysics · Physics
2015-06-16
C. Gontikakis , S. Patsourakos , C. Efthymiopoulos , A. Anastasiadis , M. K. Georgoulis
Phase-mixing of Alfv\'en waves in the solar corona has been identified as one possible candidate to explain coronal heating. While this scenario is supported by observations of ubiquitous oscillations in the corona carrying sufficient wave…
Recent observations suggest that magnetic flux cancellation may play a crucial role in heating the Sun's upper atmosphere (chromosphere, transition region, corona). Here, we intended to validate an analytic model for magnetic reconnection…
Recent imaging observations of EUV line emissions have shown evidence for frequent flare-like events in a majority of the pixels in quiet regions of the solar corona. The changes in coronal emission measure indicate impulsive heating of new…
A full 3-dimensional compressible magnetohydrodynamic (MHD) simulation is conducted to investigate the thermal responses of a coronal loop to the dynamic dissipation processes of MHD waves. When the foot points of the loop are randomly and…