skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: FLOWS AT THE EDGE OF AN ACTIVE REGION: OBSERVATION AND INTERPRETATION

Abstract

Upflows observed at the edges of active regions have been proposed as the source of the slow solar wind. In the particular case of Active Region (AR) 10942, where such an upflow has been already observed, we want to evaluate the part of this upflow that actually remains confined in the magnetic loops that connect AR 10942 to AR 10943. Both active regions were visible simultaneously on the solar disk and were observed by STEREO/SECCHI EUVI. Using Hinode/EIS spectra, we determine the Doppler shifts and densities in AR 10943 and AR 10942 in order to evaluate the mass flows. We also perform magnetic field extrapolations to assess the connectivity between AR 10942 and AR 10943. AR 10943 displays a persistent downflow in Fe XII. Magnetic extrapolations including both ARs show that this downflow can be connected to the upflow in AR 10942. We estimate that the mass flow received by AR 10943 areas connected to AR 10942 represents about 18% of the mass flow from AR 10942. We conclude that the upflows observed on the edge of active regions represent either large-scale loops with mass flowing along them (accounting for about one-fifth of the total mass flow in this example)more » or open magnetic field structures where the slow solar wind originates.« less

Authors:
; ;  [1];  [2]
  1. Universite Paris Sud, Institut d'Astrophysique Spatiale, UMR8617, 91405 Orsay (France)
  2. Jeremiah Horrocks Institute, University of Central Lancashire, Preston, PR1 2HE (United Kingdom)
Publication Date:
OSTI Identifier:
22037121
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 752; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; DATA ANALYSIS; DENSITY; DOPPLER EFFECT; EMISSION SPECTRA; EXTRAPOLATION; MAGNETIC FIELDS; MASS; SOLAR CORONA; SOLAR WIND; SUN; ULTRAVIOLET RADIATION

Citation Formats

Boutry, C., Buchlin, E., Vial, J.-C., and Regnier, S., E-mail: eric.buchlin@ias.u-psud.fr. FLOWS AT THE EDGE OF AN ACTIVE REGION: OBSERVATION AND INTERPRETATION. United States: N. p., 2012. Web. doi:10.1088/0004-637X/752/1/13.
Boutry, C., Buchlin, E., Vial, J.-C., & Regnier, S., E-mail: eric.buchlin@ias.u-psud.fr. FLOWS AT THE EDGE OF AN ACTIVE REGION: OBSERVATION AND INTERPRETATION. United States. doi:10.1088/0004-637X/752/1/13.
Boutry, C., Buchlin, E., Vial, J.-C., and Regnier, S., E-mail: eric.buchlin@ias.u-psud.fr. Sun . "FLOWS AT THE EDGE OF AN ACTIVE REGION: OBSERVATION AND INTERPRETATION". United States. doi:10.1088/0004-637X/752/1/13.
@article{osti_22037121,
title = {FLOWS AT THE EDGE OF AN ACTIVE REGION: OBSERVATION AND INTERPRETATION},
author = {Boutry, C. and Buchlin, E. and Vial, J.-C. and Regnier, S., E-mail: eric.buchlin@ias.u-psud.fr},
abstractNote = {Upflows observed at the edges of active regions have been proposed as the source of the slow solar wind. In the particular case of Active Region (AR) 10942, where such an upflow has been already observed, we want to evaluate the part of this upflow that actually remains confined in the magnetic loops that connect AR 10942 to AR 10943. Both active regions were visible simultaneously on the solar disk and were observed by STEREO/SECCHI EUVI. Using Hinode/EIS spectra, we determine the Doppler shifts and densities in AR 10943 and AR 10942 in order to evaluate the mass flows. We also perform magnetic field extrapolations to assess the connectivity between AR 10942 and AR 10943. AR 10943 displays a persistent downflow in Fe XII. Magnetic extrapolations including both ARs show that this downflow can be connected to the upflow in AR 10942. We estimate that the mass flow received by AR 10943 areas connected to AR 10942 represents about 18% of the mass flow from AR 10942. We conclude that the upflows observed on the edge of active regions represent either large-scale loops with mass flowing along them (accounting for about one-fifth of the total mass flow in this example) or open magnetic field structures where the slow solar wind originates.},
doi = {10.1088/0004-637X/752/1/13},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}