Autor(es)

Zurbriggen, E. ^[1] ; Sieyra, V, M. ; Costa, A. ^[2] ; Esquivel, A. ^{[2, 3]} ; Stenborg, G. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Presbiteriana Mackenzie, Escola Engn, Ctr Radio Astron & Astrofis Mackenzie CRAAM, Rua Consolacao 896, BR-01302907 Sao Paulo, SP - Brazil

^[2] Consejo Nacl Invest Cient & Tecn, Inst Astron Teor & Expt IATE, Laprida 854, RA-5000 Cordoba - Argentina

^[3] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, A Postal 70-543, Ciudad De Mexico 04510 - Mexico

^[4] US Naval Res Lab, Space Sci Div, Washington, DC 20375 - USA

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 494, n. 4, p. 5270-5278, JUN 2020.
• Citações Web of Science: 0

Resumo

Slow waves are commonly observed on the entire solar atmosphere. Assuming a thin flux tube approximation, the cut-off periods of slow-mode magneto-acoustic-gravity waves that travel from the photosphere to the corona were obtained in Costa et al. In that paper, however, a typo in the specific heat coefficient at constant pressure cp value led to an inconsistency in the cut-off calculation, which is only significant at the transition region. Due to the abrupt temperature change in the region, a change of the mean atomic weight (by a factor of approximately 2) also occurs, but is often overlooked in analytical models for simplicity purposes. In this paper, we revisit the calculation of the cut-off periods of magneto-acoustic-gravity waves in Costa et al. by considering an atmosphere in hydrostatic equilibrium with a temperature profile, with the inclusion of the variation of the mean atomic weight and the correction of the inconsistency aforementioned. In addition, we measure the dominant periods near a particular active region (AR 1243) as observed by the Atmospheric Imaging Assembly (AIA) on-board the Solar Dynamic Observatory (SDO) on 2011 July 3 and compare them to our analytical results. The cut-off periods obtained analytically are consistent with the corresponding periods measured in observations. (AU)

• Processo FAPESP: 18/25177-4 - Modelagem de fluxos descendentes escuros (Supra-arcade downflows) através de seus sinais em rádio e microondas
• Beneficiário: Ernesto Zurbriggen
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado