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New Eyes on the COld Sun: A Multimodal Study of Carbon Monoxide in the Solar Atmosphere
New Eyes on the COld Sun: A Multimodal Study of Carbon Monoxide in the Solar Atmosphere
New Eyes on the COld Sun: A Multimodal Study of Carbon Monoxide in the Solar Atmosphere

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152127
ISBN  
9798384052487
DDC  
523
저자명  
Stauffer, Johnathan R.
서명/저자  
New Eyes on the COld Sun: A Multimodal Study of Carbon Monoxide in the Solar Atmosphere
발행사항  
[Sl] : University of Colorado at Boulder, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
218 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Rast, Mark;Reardon, Kevin.
학위논문주기  
Thesis (Ph.D.)--University of Colorado at Boulder, 2024.
초록/해제  
요약The spectroscopic detections of carbon monoxide (CO) above the solar limb suggests that cool gas permeates the solar atmosphere throughout the low chromosphere. However, no consensus exists regarding how significant amounts of CO-laden plasma persist in the predominantly hot and violent environment of the chromosphere. In this dissertation, I combine observation and simulation to study the life cycle this so-called "solar COmosphere". First, I describe my discovery of transient "cold bubbles" in the solar atmosphere, which are visible in CO's infrared absorption spectrum. These bubbles, which reach several thousand kilometers in size and could last as much as 40 minutes, show exponential growth and decay with timescales consistent chemical reaction rates in the low chromosphere - significantly higher than the typical formation height of the CO spectrum inferred from the same observations. To further understand these features I analyzed a Bifrost simulation of the solar atmosphere, where transient pockets of cool gas were found to form in the low chromosphere due to adiabatic expansion of the horizontal magnetic canopy field. These features produced measurable deepening the synthesized CO lines, with the strongest signatures originating from the rapid expansion of newly emerged flux into the chromosphere. However, weaker signatures associated with the transverse motions of photospheric bright points were much more common, and are therefore more likely to explain the observed CO limb extensions. This analysis was supplemented by CO5BOLD simulations incorporating realistic, time-dependent atmospheric chemistry, which confirmed that CO populations in these cold bubbles remain close to chemical equilibrium - a necessary condition if they are to contribute to the observed CO limb extensions. Lastly, I present some preliminary results from several unique observational efforts aimed at searching for cold bubbles in the infrared and millimeter solar spectrum. I conclude with a brief discussion of observing and simulation strategies for future investigations of solar CO.
일반주제명  
Astrophysics
일반주제명  
Atmospheric chemistry
일반주제명  
Astronomy
일반주제명  
Planetology
일반주제명  
Optics
키워드  
Observations
키워드  
Simulations
키워드  
Solar atmosphere
키워드  
Spectroscopy
키워드  
Carbon monoxide
기타저자  
University of Colorado at Boulder Astrophysical and Planetary Sciences
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798384052487
■035    ▼a(MiAaPQ)AAI31482804
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a523
■1001  ▼aStauffer,  Johnathan  R.▼0(orcid)0000-0002-6495-4685
■24510▼aNew  Eyes  on  the  COld  Sun:  A  Multimodal  Study  of  Carbon  Monoxide  in  the  Solar  Atmosphere
■260    ▼a[Sl]▼bUniversity  of  Colorado  at  Boulder▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a218  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Rast,  Mark;Reardon,  Kevin.
■5021  ▼aThesis  (Ph.D.)--University  of  Colorado  at  Boulder,  2024.
■520    ▼aThe  spectroscopic  detections  of  carbon  monoxide  (CO)  above  the  solar  limb  suggests  that  cool  gas  permeates  the  solar  atmosphere  throughout  the  low  chromosphere.  However,  no  consensus  exists  regarding  how  significant  amounts  of  CO-laden  plasma  persist  in  the  predominantly  hot  and  violent  environment  of  the  chromosphere.  In  this  dissertation,  I  combine  observation  and  simulation  to  study  the  life  cycle  this  so-called  "solar  COmosphere".  First,  I  describe  my  discovery  of  transient  "cold  bubbles"  in  the  solar  atmosphere,  which  are  visible  in  CO's  infrared  absorption  spectrum.  These  bubbles,  which  reach  several  thousand  kilometers  in  size  and  could  last  as  much  as  40  minutes,  show  exponential  growth  and  decay  with  timescales  consistent  chemical  reaction  rates  in  the  low  chromosphere  -  significantly  higher  than  the  typical  formation  height  of  the  CO  spectrum  inferred  from  the  same  observations.  To  further  understand  these  features  I  analyzed  a  Bifrost  simulation  of  the  solar  atmosphere,  where  transient  pockets  of  cool  gas  were  found  to  form  in  the  low  chromosphere  due  to  adiabatic  expansion  of  the  horizontal  magnetic  canopy  field.  These  features  produced  measurable  deepening  the  synthesized  CO  lines,  with  the  strongest  signatures  originating  from  the  rapid  expansion  of  newly  emerged  flux  into  the  chromosphere.  However,  weaker  signatures  associated  with  the  transverse  motions  of  photospheric  bright  points  were  much  more  common,  and  are  therefore  more  likely  to  explain  the  observed  CO  limb  extensions.  This  analysis  was  supplemented  by  CO5BOLD  simulations  incorporating  realistic,  time-dependent  atmospheric  chemistry,  which  confirmed  that  CO  populations  in  these  cold  bubbles  remain  close  to  chemical  equilibrium  -  a  necessary  condition  if  they  are  to  contribute  to  the  observed  CO  limb  extensions.  Lastly,  I  present  some  preliminary  results  from  several  unique  observational  efforts  aimed  at  searching  for  cold  bubbles  in  the  infrared  and  millimeter  solar  spectrum.  I  conclude  with  a  brief  discussion  of  observing  and  simulation  strategies  for  future  investigations  of  solar  CO.
■590    ▼aSchool  code:  0051.
■650  4▼aAstrophysics
■650  4▼aAtmospheric  chemistry
■650  4▼aAstronomy
■650  4▼aPlanetology
■650  4▼aOptics
■653    ▼aObservations
■653    ▼aSimulations
■653    ▼aSolar  atmosphere
■653    ▼aSpectroscopy
■653    ▼aCarbon  monoxide
■690    ▼a0596
■690    ▼a0752
■690    ▼a0606
■690    ▼a0590
■690    ▼a0371
■71020▼aUniversity  of  Colorado  at  Boulder▼bAstrophysical  and  Planetary  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0051
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163034▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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