Abstract
This paper presents the first results of a study of current helicity of the large-scale magnetic field (LSMF) using full-disk longitudinal Blong magnetograms from the Michelson Doppler Imager on board the SOHO spacecraft. We employ a known technique to reconstruct the vector magnetic field under the assumption of relatively slow evolution of the LSMF and treat the variations of Blong, occurring during a defined period of time as the result of the changing projection angle only. We compute the synoptic maps of radial (Br) and toroidal (Bλ) magnetic fields and the latitudinal profile of current helicity density hc = Br(∇ ×)r. For eight solar rotations (1910-1917) that have been analyzed, hc shows significant variations within ±40° of solar latitude with no strong hemispheric sign asymmetry. Asymmetry is present, however, in high latitudes, where hc is negative/positive in the northern/southern hemisphere.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
