Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center
Atmospheric gravity waves (AGWs) are low-frequency, buoyancy-driven waves that are generated by turbulent convection and propagate obliquely throughout the solar atmosphere. Their proposed energy contribution to the lower solar atmosphere and sensitivity to atmospheric parameters (e.g., magnetic fie...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acd930 |
| _version_ | 1827828459588550656 |
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| author | Oana Vesa Jason Jackiewicz Kevin Reardon |
| author_facet | Oana Vesa Jason Jackiewicz Kevin Reardon |
| author_sort | Oana Vesa |
| collection | DOAJ |
| description | Atmospheric gravity waves (AGWs) are low-frequency, buoyancy-driven waves that are generated by turbulent convection and propagate obliquely throughout the solar atmosphere. Their proposed energy contribution to the lower solar atmosphere and sensitivity to atmospheric parameters (e.g., magnetic fields and radiative damping) highlight their diagnostic potential. We investigate AGWs near a quiet-Sun disk center region using multiwavelength data from the Interferometric Bidimensional Spectrometer and the Solar Dynamics Observatory. These observations showcase the complex wave behavior present in the entire acoustic-gravity wave spectrum. Using Fourier spectral analysis and local helioseismology techniques on simultaneously observed line core Doppler velocity and intensity fluctuations, we study both the vertical and horizontal properties of AGWs. Propagating AGWs with perpendicular group and phase velocities are detected at the expected temporal and spatial scales throughout the lower solar atmosphere. We also find previously unobserved, varied phase difference distributions among our velocity and intensity diagnostic combinations. Time–distance analysis indicates that AGWs travel with an average group speed of 4.5 km s ^−1 , which is only partially described by a simple simulation, suggesting that high-frequency AGWs dominate the signal. Analysis of the median magnetic field (4.2 G) suggests that propagating AGWs are not significantly affected by quiet-Sun photospheric magnetic fields. Our results illustrate the importance of multiheight observations and the necessity of future work to properly characterize this observed behavior. |
| first_indexed | 2024-03-12T03:51:27Z |
| format | Article |
| id | doaj.art-506d2871d9f54b6780e9dd238362c2d3 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T03:51:27Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-506d2871d9f54b6780e9dd238362c2d32023-09-03T12:17:44ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0195215810.3847/1538-4357/acd930Multiheight Observations of Atmospheric Gravity Waves at Solar Disk CenterOana Vesa0https://orcid.org/0000-0001-6754-1520Jason Jackiewicz1https://orcid.org/0000-0001-9659-7486Kevin Reardon2https://orcid.org/0000-0001-8016-0001Department of Astronomy, New Mexico State University , P.O. Box 30001, MSC 4500, Las Cruces, NM 88003-8001, USA ; ovesa@nmsu.eduDepartment of Astronomy, New Mexico State University , P.O. Box 30001, MSC 4500, Las Cruces, NM 88003-8001, USA ; ovesa@nmsu.eduNational Solar Observatory , Boulder, CO 80303, USAAtmospheric gravity waves (AGWs) are low-frequency, buoyancy-driven waves that are generated by turbulent convection and propagate obliquely throughout the solar atmosphere. Their proposed energy contribution to the lower solar atmosphere and sensitivity to atmospheric parameters (e.g., magnetic fields and radiative damping) highlight their diagnostic potential. We investigate AGWs near a quiet-Sun disk center region using multiwavelength data from the Interferometric Bidimensional Spectrometer and the Solar Dynamics Observatory. These observations showcase the complex wave behavior present in the entire acoustic-gravity wave spectrum. Using Fourier spectral analysis and local helioseismology techniques on simultaneously observed line core Doppler velocity and intensity fluctuations, we study both the vertical and horizontal properties of AGWs. Propagating AGWs with perpendicular group and phase velocities are detected at the expected temporal and spatial scales throughout the lower solar atmosphere. We also find previously unobserved, varied phase difference distributions among our velocity and intensity diagnostic combinations. Time–distance analysis indicates that AGWs travel with an average group speed of 4.5 km s ^−1 , which is only partially described by a simple simulation, suggesting that high-frequency AGWs dominate the signal. Analysis of the median magnetic field (4.2 G) suggests that propagating AGWs are not significantly affected by quiet-Sun photospheric magnetic fields. Our results illustrate the importance of multiheight observations and the necessity of future work to properly characterize this observed behavior.https://doi.org/10.3847/1538-4357/acd930Quiet sunSolar photosphereSolar atmosphereSolar oscillationsSolar physics |
| spellingShingle | Oana Vesa Jason Jackiewicz Kevin Reardon Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center The Astrophysical Journal Quiet sun Solar photosphere Solar atmosphere Solar oscillations Solar physics |
| title | Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center |
| title_full | Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center |
| title_fullStr | Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center |
| title_full_unstemmed | Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center |
| title_short | Multiheight Observations of Atmospheric Gravity Waves at Solar Disk Center |
| title_sort | multiheight observations of atmospheric gravity waves at solar disk center |
| topic | Quiet sun Solar photosphere Solar atmosphere Solar oscillations Solar physics |
| url | https://doi.org/10.3847/1538-4357/acd930 |
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