Three sequences of Ca II K images obtained on May 3, May 19 and June 7, 1997 with the PSPT (Precision Solar Photometric Telescope) instrument at the Rome Observatory have been used to study variations of the chromospheric network on a short time scale. We have applied to each PSPT image an automated algorithm developed to derive the skeleton representative of the network pattern and to identify the internetwork cells. By using both of them, we have computed power spectra of chromospheric intensity oscillations in network and internetwork regions. We have also compared network cell patterns derived for a quiet region over two hours of observations and described the displacements of the barycenters of the cells bordered by the network loops. The spectral analysis on data obtained by applying the network identification procedure shows distinct network and internetwork intensity oscillations. We confirm the findings of other workers that the network does not participate in chromospheric three-minute oscillations, but that instead it oscillates in slow wave motions which are neither present in the surrounding internetwork chromosphere.

Chromospheric network properties on short time scales from PSPT images

PIETROPAOLO, Ermanno;
1998-01-01

Abstract

Three sequences of Ca II K images obtained on May 3, May 19 and June 7, 1997 with the PSPT (Precision Solar Photometric Telescope) instrument at the Rome Observatory have been used to study variations of the chromospheric network on a short time scale. We have applied to each PSPT image an automated algorithm developed to derive the skeleton representative of the network pattern and to identify the internetwork cells. By using both of them, we have computed power spectra of chromospheric intensity oscillations in network and internetwork regions. We have also compared network cell patterns derived for a quiet region over two hours of observations and described the displacements of the barycenters of the cells bordered by the network loops. The spectral analysis on data obtained by applying the network identification procedure shows distinct network and internetwork intensity oscillations. We confirm the findings of other workers that the network does not participate in chromospheric three-minute oscillations, but that instead it oscillates in slow wave motions which are neither present in the surrounding internetwork chromosphere.
1-886733-60-0
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11697/38914
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 1
social impact