Signatures of Cross-sectional Width Modulation in Solar Spicules due to Field-aligned Flows
We report the first observational detection of frequency modulation in the cross-sectional width of spicule structures due to field-aligned plasma flows. Cross-sectional width variations were estimated for the least superimposed off-limb spicules observed in high-resolution H imaging spectroscopy da...
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| Veröffentlicht in: | The Astrophysical journal 2020-12, Vol.905 (1), p.72 |
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| creator | Mackenzie Dover, Fionnlagh Sharma, Rahul Korsós, Marianna B. Erdélyi, Robertus |
| description | We report the first observational detection of frequency modulation in the cross-sectional width of spicule structures due to field-aligned plasma flows. Cross-sectional width variations were estimated for the least superimposed off-limb spicules observed in high-resolution H imaging spectroscopy data. Analysis of estimated cross-sectional widths suggest periodic oscillations, concurrent with 2D numerical modeling for a jet structure in a stratified solar atmosphere. Spectral analysis for both observed and simulated cross-sectional widths indicate frequency modulation as noticeable shifts in estimated periodicities during rise and fall phases of field-aligned plasma flows in the jet structure. Furthermore, the presence of the first overtone in a dynamic/spicular waveguide is also evident in both the observed and the simulated jet structures. These harmonics can be an important tool for future chromospheric magnetoseismology investigations and applications to dynamic waveguides (like spicules). |
| doi_str_mv | 10.3847/1538-4357/abc349 |
| format | Article |
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| source | Institute of Physics Open Access Journal Titles |
| subjects | Astrophysics Atmospheric models Cross-sections Frequency modulation H alpha line Image resolution Periodicities Solar atmosphere Solar chromosphere Solar spicules Spectral analysis Spectroscopy Spectrum analysis Spicules The Sun Two dimensional models Waveguides |
| title | Signatures of Cross-sectional Width Modulation in Solar Spicules due to Field-aligned Flows |
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