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Probing Temperatures and Dynamics in Solar Chromosphere With Multi-Wavelength Observations
Probing Temperatures and Dynamics in Solar Chromosphere With Multi-Wavelength Observations
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211151143
- ISBN
- 9798382720142
- DDC
- 523
- 저자명
- Hofmann, R. A.
- 서명/저자
- Probing Temperatures and Dynamics in Solar Chromosphere With Multi-Wavelength Observations
- 발행사항
- [Sl] : University of Colorado at Boulder, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 146 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
- 주기사항
- Advisor: Reardon, Kevin.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2024.
- 초록/해제
- 요약This dissertation presents a comprehensive investigation of the solar chromosphere through observational analyses conducted with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interferometric BIdimensional Spectrometer (IBIS). The first paper focuses on a solar plage, employing ALMA in the millimeter-continuum and IBIS in the Ca II 8542 A and Na I 5896 A spectral lines. The goal is to compare local gas temperatures measured by ALMA with non-local thermodynamic equilibrium (non-LTE) inversions using the Stockholm Inversion Code (STIC). Results indicate that referencing column mass as the height scale enhances the reliability of atmospheric profiles above the temperature minimum, and accounting for non-LTE hydrogen ionization aligns chromospheric temperatures with ALMA measurements. Incorporating millimeter continuum intensities as constraints reveals insights into the chromospheric structure, emphasizing the challenges posed by electron density uncertainties in determining height(s) of formation for millimeter continuum emissions. In the second paper, time-series ALMA observations of quiet-sun and plage regions in different wavelength bands are compared with cotemporal Ca II 8542 A line profiles, probing acoustic wave indicators. Through epoch analysis and cross-correlation, consistent correspondences between acoustic shocks in the Ca II 8542 velocity and ALMA brightness temperatures are identified, unveiling challenges in relating time-domain ALMA observations to traditional spectral line diagnostics, particularly in dynamic regions with variable magnetic structures. This work contributes to our nuanced understanding of chromospheric dynamics and underscores the complexities in leveraging ALMA observations as a chromospheric thermometer, shedding light on the intricacies of solar atmospheric processes.
- 일반주제명
- Astrophysics
- 일반주제명
- Astronomy
- 일반주제명
- Computational physics
- 키워드
- Solar physics
- 키워드
- Spectroscopy
- 키워드
- Sun chromosphere
- 기타저자
- University of Colorado at Boulder Astrophysical and Planetary Sciences
- 기본자료저록
- Dissertations Abstracts International. 85-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211151143
■006m o d
■007cr#unu||||||||
■020 ▼a9798382720142
■035 ▼a(MiAaPQ)AAI31234586
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a523
■1001 ▼aHofmann, R. A.▼0(orcid)0000-0002-5556-6840
■24510▼aProbing Temperatures and Dynamics in Solar Chromosphere With Multi-Wavelength Observations
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a146 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 85-11, Section: B.
■500 ▼aAdvisor: Reardon, Kevin.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2024.
■520 ▼aThis dissertation presents a comprehensive investigation of the solar chromosphere through observational analyses conducted with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interferometric BIdimensional Spectrometer (IBIS). The first paper focuses on a solar plage, employing ALMA in the millimeter-continuum and IBIS in the Ca II 8542 A and Na I 5896 A spectral lines. The goal is to compare local gas temperatures measured by ALMA with non-local thermodynamic equilibrium (non-LTE) inversions using the Stockholm Inversion Code (STIC). Results indicate that referencing column mass as the height scale enhances the reliability of atmospheric profiles above the temperature minimum, and accounting for non-LTE hydrogen ionization aligns chromospheric temperatures with ALMA measurements. Incorporating millimeter continuum intensities as constraints reveals insights into the chromospheric structure, emphasizing the challenges posed by electron density uncertainties in determining height(s) of formation for millimeter continuum emissions. In the second paper, time-series ALMA observations of quiet-sun and plage regions in different wavelength bands are compared with cotemporal Ca II 8542 A line profiles, probing acoustic wave indicators. Through epoch analysis and cross-correlation, consistent correspondences between acoustic shocks in the Ca II 8542 velocity and ALMA brightness temperatures are identified, unveiling challenges in relating time-domain ALMA observations to traditional spectral line diagnostics, particularly in dynamic regions with variable magnetic structures. This work contributes to our nuanced understanding of chromospheric dynamics and underscores the complexities in leveraging ALMA observations as a chromospheric thermometer, shedding light on the intricacies of solar atmospheric processes.
■590 ▼aSchool code: 0051.
■650 4▼aAstrophysics
■650 4▼aAstronomy
■650 4▼aComputational physics
■653 ▼aRadiative transfer
■653 ▼aSolar physics
■653 ▼aSpectroscopic inversions
■653 ▼aSpectroscopy
■653 ▼aSun chromosphere
■690 ▼a0596
■690 ▼a0216
■690 ▼a0606
■71020▼aUniversity of Colorado at Boulder▼bAstrophysical and Planetary Sciences.
■7730 ▼tDissertations Abstracts International▼g85-11B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160968▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
