Interplanetary Lyman α line profiles: variations with solar activity cycle E. Quémerais, R. Lallement, J.-L. Bertaux, D. Koutroumpa, J. Clarke, E. Kyrölä and W. Schmidt A&A, 455 3 (2006) 1135-1142 Published online: 16 August 2006 DOI: 10.1051/0004-6361:20065169