Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona

Aims. To study intensity oscillations in the solar chromosphere/corona above a quiet-Sun magnetic network. Methods. We analyse the time series of He II 256.32, Fe XI 188.23 and Fe XII 195.12 spectral lines observed by EUV Imaging Spectrometer (EIS) on board Hinode near the south pole. Then we use a...

Full description

Bibliographic Details
Main Authors: Srivastava, A. K., Kuridze, D., Zaqarashvili, T. V., Dwivedi, B. N.
Format: Text
Language:unknown
Published: arXiv 2008
Subjects:
Online Access:https://dx.doi.org/10.48550/arxiv.0802.0571
https://arxiv.org/abs/0802.0571
id ftdatacite:10.48550/arxiv.0802.0571
record_format openpolar
spelling ftdatacite:10.48550/arxiv.0802.0571 2023-05-15T18:22:00+02:00 Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona Srivastava, A. K. Kuridze, D. Zaqarashvili, T. V. Dwivedi, B. N. 2008 https://dx.doi.org/10.48550/arxiv.0802.0571 https://arxiv.org/abs/0802.0571 unknown arXiv https://dx.doi.org/10.1051/0004-6361:20079328 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Astrophysics astro-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2008 ftdatacite https://doi.org/10.48550/arxiv.0802.0571 https://doi.org/10.1051/0004-6361:20079328 2022-04-01T15:53:32Z Aims. To study intensity oscillations in the solar chromosphere/corona above a quiet-Sun magnetic network. Methods. We analyse the time series of He II 256.32, Fe XI 188.23 and Fe XII 195.12 spectral lines observed by EUV Imaging Spectrometer (EIS) on board Hinode near the south pole. Then we use a standard wavelet tool to produce power spectra of intensity oscillations above the magnetic network. Results. We get ~7 min intensity oscillations in all spectral lines and ~13 min intensity oscillations only in He II with the probability of ~96-98 %, which probably reflects the process of magneto-acoustic wave propagation above the network. Conclusions. We suggest that field-free cavity areas under bipolar magnetic canopies in the vicinity of magnetic network may serve as resonators for the magneto-acoustic waves. The cavities with photospheric sound speed and granular dimensions may produce the waves with the observed periods. The waves may propagate upwards in the transition region/corona and cause observed intensity oscillations. : 12 pages, 6 figures Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic Astrophysics astro-ph
FOS Physical sciences
spellingShingle Astrophysics astro-ph
FOS Physical sciences
Srivastava, A. K.
Kuridze, D.
Zaqarashvili, T. V.
Dwivedi, B. N.
Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
topic_facet Astrophysics astro-ph
FOS Physical sciences
description Aims. To study intensity oscillations in the solar chromosphere/corona above a quiet-Sun magnetic network. Methods. We analyse the time series of He II 256.32, Fe XI 188.23 and Fe XII 195.12 spectral lines observed by EUV Imaging Spectrometer (EIS) on board Hinode near the south pole. Then we use a standard wavelet tool to produce power spectra of intensity oscillations above the magnetic network. Results. We get ~7 min intensity oscillations in all spectral lines and ~13 min intensity oscillations only in He II with the probability of ~96-98 %, which probably reflects the process of magneto-acoustic wave propagation above the network. Conclusions. We suggest that field-free cavity areas under bipolar magnetic canopies in the vicinity of magnetic network may serve as resonators for the magneto-acoustic waves. The cavities with photospheric sound speed and granular dimensions may produce the waves with the observed periods. The waves may propagate upwards in the transition region/corona and cause observed intensity oscillations. : 12 pages, 6 figures
format Text
author Srivastava, A. K.
Kuridze, D.
Zaqarashvili, T. V.
Dwivedi, B. N.
author_facet Srivastava, A. K.
Kuridze, D.
Zaqarashvili, T. V.
Dwivedi, B. N.
author_sort Srivastava, A. K.
title Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
title_short Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
title_full Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
title_fullStr Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
title_full_unstemmed Intensity oscillations observed with Hinode near the south pole of the Sun: leakage of low frequency magneto-acoustic waves into the solar corona
title_sort intensity oscillations observed with hinode near the south pole of the sun: leakage of low frequency magneto-acoustic waves into the solar corona
publisher arXiv
publishDate 2008
url https://dx.doi.org/10.48550/arxiv.0802.0571
https://arxiv.org/abs/0802.0571
geographic South Pole
geographic_facet South Pole
genre South pole
genre_facet South pole
op_relation https://dx.doi.org/10.1051/0004-6361:20079328
op_rights arXiv.org perpetual, non-exclusive license
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
op_doi https://doi.org/10.48550/arxiv.0802.0571
https://doi.org/10.1051/0004-6361:20079328
_version_ 1766201357666091008