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Title: 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:
 [1]
  1. 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}
}