since 05 February 2011 :
View(s): 149 (9 ULiège)
Download(s): 1 (0 ULiège)
print        
Susanta Kumar Bisoi, Diptiranjan Rout, Janardhan Padmanabhan, Ken’ichi Fujiki, Dibyendu Chakrabarty & Karan Sahu

Prolonged and Extremely Non-radial Solar Wind Flows

(Volume 93 - Année 2024 — No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation)
Article
Open Access

Attached document(s)

original pdf file

Abstract

We present a study of three highly non-radial solar wind events in which the azimuthal solar wind flow angle exceeds 6° for one day or more. None of the events are associated with coronal mass ejections and co-rotating interaction regions observed at 1 AU. For all events, the solar wind outflows at 1 AU exhibit low velocity and density. Based on the significant increase in the oxygen charge state ratio of O7+/O6+ at 1 AU for all of the events, we have traced them back to the Sun and found that their source regions originated in active region and coronal hole (AR-CH) pairs mainly located at the central meridian. Furthermore, examining the dynamical evolutions in their source regions using both the Extreme ultra-violet Imaging Telescope and the Michelson Doppler Imager, we found that the changes taking place in AR-CH boundaries eventually disturbed the stable CH configurations, resulting in a reduction of the CH area and finally its disappearance, leaving only with the AR. Our study provides a possible explanation for discussing the origin of the prolonged and highly non-radial solar wind flows.

Keywords : Solar Wind, Non-radial Solar Wind, Space Weather

To cite this article

Susanta Kumar Bisoi, Diptiranjan Rout, Janardhan Padmanabhan, Ken’ichi Fujiki, Dibyendu Chakrabarty & Karan Sahu, «Prolonged and Extremely Non-radial Solar Wind Flows», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 1004-1017 URL : https://popups.ulg.ac.be/0037-9565/index.php?id=11946.

About: Susanta Kumar Bisoi

Department of Physics and Astronomy, National Institute of Technology, Rourkela -769008, India. Corresponding author: bisois@nitrkl.ac.in

About: Diptiranjan Rout

National Atmospheric Research Laboratory, Gadanki, India

About: Janardhan Padmanabhan

Astronomy & Astrophysics Division, Physical Research Laboratory, Navrangpura, Ahmedabad, India

About: Ken’ichi Fujiki

Institute for Space-Earth Environmental Research, Nagoya, Japan

About: Dibyendu Chakrabarty

Space & Atmospheric Science Division, Physical Research Laboratory, Navrangpura, Ahmedabad, India

About: Karan Sahu

Department of Physics and Astronomy, National Institute of Technology, Rourkela -769008, India