What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978

por Démoulin, P., Mandrini, C.H., Van Driel-Gesztelyi, L., Thompson, B.J., Plunkett, S., Kovári, Zs., Aulanier, G., Young, A.

The structure and evolution of a sigmoidal active region

por Gibson, S.E., Fletcher, L., Del Zanna, G., Pike, C.D., Mason, H.E., Mandrini, C.H., Démoulin, P., Gilbert, H., Burkepile, J., Holzer, T., Alexander, D., Liu, Y., Nitta, N., Qiu, J., Schmieder, B., Thompson, B.J.