ON THE POLARIMETRIC SIGNATURE OF EMERGING MAGNETIC LOOPS IN THE QUIET SUN
Abstract
The abundance of Stokes V profiles dominated by one lobe at the locations of emergence of {Omega}-shaped magnetic loops is evaluated. The emergence events were found in Hinode Solar Optical Telescope/spectro-polarimeter time sequences of quiet-Sun regions. Such a study has the aim of confirming a prediction based on the basic geometrical and physical properties of emerging magnetic loops: Stokes V profiles dominated by one lobe are possibly the main polarimetric signature of these structures. In agreement with this prediction, 47% of the Stokes V profiles analyzed have an amplitude asymmetry |{delta}a| > 0.3, while in the quiet Sun the abundance is of about 30%. This excess with respect to the quiet Sun is found consistently for any value of the threshold on the amplitude asymmetry. Such a result proves the goodness of the physical scenarios so far proposed for the interpretation of loop emergence events and may prompt the use of Stokes V profiles dominated by one lobe as a new proxy for their identification in observations with a good spectral sampling.
- Authors:
-
- ESA/ESTEC RSSD, Keplerlaan 1, 2200 AG Noordwijk (Netherlands)
- Publication Date:
- OSTI Identifier:
- 22047978
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal Letters
- Additional Journal Information:
- Journal Volume: 747; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; ASTROPHYSICS; ASYMMETRY; MAGNETIC FIELD CONFIGURATIONS; MAGNETISM; PHOTOSPHERE; PHYSICAL PROPERTIES; POLARIMETRY; SAMPLING; SUN; SURFACES; TELESCOPES; TOPOLOGY
Citation Formats
Viticchie, B. ON THE POLARIMETRIC SIGNATURE OF EMERGING MAGNETIC LOOPS IN THE QUIET SUN. United States: N. p., 2012.
Web. doi:10.1088/2041-8205/747/2/L36.
Viticchie, B. ON THE POLARIMETRIC SIGNATURE OF EMERGING MAGNETIC LOOPS IN THE QUIET SUN. United States. https://doi.org/10.1088/2041-8205/747/2/L36
Viticchie, B. 2012.
"ON THE POLARIMETRIC SIGNATURE OF EMERGING MAGNETIC LOOPS IN THE QUIET SUN". United States. https://doi.org/10.1088/2041-8205/747/2/L36.
@article{osti_22047978,
title = {ON THE POLARIMETRIC SIGNATURE OF EMERGING MAGNETIC LOOPS IN THE QUIET SUN},
author = {Viticchie, B},
abstractNote = {The abundance of Stokes V profiles dominated by one lobe at the locations of emergence of {Omega}-shaped magnetic loops is evaluated. The emergence events were found in Hinode Solar Optical Telescope/spectro-polarimeter time sequences of quiet-Sun regions. Such a study has the aim of confirming a prediction based on the basic geometrical and physical properties of emerging magnetic loops: Stokes V profiles dominated by one lobe are possibly the main polarimetric signature of these structures. In agreement with this prediction, 47% of the Stokes V profiles analyzed have an amplitude asymmetry |{delta}a| > 0.3, while in the quiet Sun the abundance is of about 30%. This excess with respect to the quiet Sun is found consistently for any value of the threshold on the amplitude asymmetry. Such a result proves the goodness of the physical scenarios so far proposed for the interpretation of loop emergence events and may prompt the use of Stokes V profiles dominated by one lobe as a new proxy for their identification in observations with a good spectral sampling.},
doi = {10.1088/2041-8205/747/2/L36},
url = {https://www.osti.gov/biblio/22047978},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 747,
place = {United States},
year = {Sat Mar 10 00:00:00 EST 2012},
month = {Sat Mar 10 00:00:00 EST 2012}
}