Evidence for the photospheric excitiation of incompressible chromospheric waves
- Publisher: American Astronomical Society
arxiv: Astrophysics::Earth and Planetary Astrophysics | Astrophysics::Solar and Stellar Astrophysics | Physics::Space Physics
Observing the excitation mechanisms of incompressible transverse waves is vital for determining how energy\ud propagates through the lower solar atmosphere. We aim to show the connection between convectively driven\ud photospheric flows and incompressible chromospheric waves. The observations presented here show the propagation\ud of incompressible motion through the quiet lower solar atmosphere, from the photosphere to the chromosphere. We\ud determine photospheric flow vectors to search for signatures of vortex motion and compare results to photospheric\ud flows present in convective simulations. Further, we search for the chromospheric response to vortex motions.\ud Evidence is presented that suggests incompressible waves can be excited by the vortex motions of a strong\ud magnetic flux concentration in the photosphere. A chromospheric counterpart to the photospheric vortex motion is\ud also observed, presenting itself as a quasi-periodic torsional motion. Fine-scale, fibril structures that emanate from\ud the chromospheric counterpart support transverse waves that are driven by the observed torsional motion. A new\ud technique for obtaining details of transverse waves from time–distance diagrams is presented and the properties of\ud transverse waves (e.g., amplitudes and periods) excited by the chromospheric torsional motion are measured.
105 references, page 1 of 11
views in local repository
downloads in local repository
The information is available from the following content providers: