We report clear observations of the magnetic Meissner effect in arrays of superconducting 4- carbon nanotubes grown in the linear channels of AlPO-5 (AFI) zeolite single crystals. Both bulk magnetization and magnetic torque experiments show a pronounced signature of the lower critical Htransition, a difference in zero-field cooled and field cooled branches during temperature sweeps below 6 K, and signatures of one-dimensional superconducting fluctuations below ∼15-18 K. These experiments extend the magnetic phase diagram we obtained previously by resistive experiments towards low magnetic fields and within the range of zero resistance. © 2011 American Physical Society.