Solar eclipse works both ways. By cutting the direct impact of the energies of the sun it can set in gloom and despair in the susceptible, but at the same time, greatly increase the aspiration in those who are ready. That is the lesson of the story of Hanuman, who as a child, rushes towards the sun at around the same time when the eclipse is about to set in.
What it means therefore is that while it would bring fear and its consequences in the mind and hearts of the evil doers who, in the rush of the moment may increase their dark activities, it will also increase the aspiration in those who are destined to cross over to the New Creation.
Falling on the 29th March when the Mother met Sri Aurobindo implies that the power of the Divine Forces, the supramental will be too strong for the darkness to bear. Their coming out in the open will be only a prelude to their exposure and destruction.
Affectionately,
Alok Da