Premium
Change in photospheric magnetic flux during coronal mass ejections
Author(s) -
Lara Alejandro,
Gopalswamy Nat,
DeForest Craig
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl003666
Subject(s) - coronal mass ejection , flux (metallurgy) , physics , protein filament , magnetic flux , flare , astrophysics , magnetic cloud , solar flare , magnetic field , solar wind , materials science , quantum mechanics , metallurgy , composite material
We report on the variations of photospheric magnetic flux during coronal mass ejections (CMEs). Using magneograms from the SOHO/MDI instrument, we have computed the magnetic flux of 7 active regions and one disappearing filament region associated with CMEs. When we plotted the flux versus time over a period of few days before, during and after the CME event, we found changes in the mean magnetic flux per pixel (∼4 arcsec²), ranging from ∼0.4 to ∼3.1 × 10 17 Mx, in structures of size smaller than the active region. Flare onsets and the filament disappearance clearly occurred during periods of significant variations in the measured magnetic flux.