Evolution of helicity in NOAA 10923 over three consecutive solar rotations

Simple item page
dc.creatorTiwari, Sanjiv Kumar
dc.creatorJoshi, Jayant
dc.creatorGosain, Sanjay
dc.creatorVenkatakrishnan, P.
dc.date2009-04-26
dc.date.accessioned2026-07-07T13:08:52Z
dc.date.available2026-07-07T13:08:52Z
dc.descriptionWe have studied the evolution of magnetic helicity and chirality in an active region over three consecutive solar rotations. The region when it first appeared was named NOAA10923 and in subsequent rotations it was numbered NOAA 10930, 10935 and 10941. We compare the chirality of these regions at photospheric, chromospheric and coronal heights. The observations used for photospheric and chromospheric heights are taken from Solar Vector Magnetograph (SVM) and H_alpha imaging telescope of Udaipur Solar Observatory (USO), respectively. We discuss the chirality of the sunspots and associated H_alpha filaments in these regions. We find that the twistedness of superpenumbral filaments is maintained in the photospheric transverse field vectors also. We also compare the chirality at photospheric and chromospheric heights with the chirality of the associated coronal loops, as observed from the HINODE X-Ray Telescope.
dc.description8 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0904.4024
dc.identifierhttp://arxiv.org/abs/0904.4024
dc.identifierTiwari, S. K., Joshi, J., Gosain, S., Venkatakrishnan, P. 2008, in Turbulence, Dynamos, Accretion Disks, Pulsars and Collective Plasma Processes, eds. S. S. Hasan, R. T. Gangadhara, & V. Krishan, 329
dc.identifierdoi:10.1007/978-1-4020-8868-1_22
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/228556
dc.subjectSolar and Stellar Astrophysics
dc.titleEvolution of helicity in NOAA 10923 over three consecutive solar rotations
dc.typetext

Files

Collections

arXiv