Forbush Decrease Catalog at MESSENGER

For each Forbush decrease (Fd) identified, we list the associated ICME boundary times i.e. the ICME start, magnetic ejecta (ME) start, and the ICME end times in ISO standard. The heliocentric at which the ICME was observed is given, as well as the maximum magnetic field strength observed within the ICME. The Fd boundary times i.e. onset, second drop (if observed), and nadir times are then listed, alongside the duration between onset and nadir (drop duration), the percentage decrease in GCR count rate between onset and nadir (drop \%), and the maximum hourly percentage decrease are listed (m$_{max}$). Finally, the number of steps observed (1, 2, or C for complex), the quality rating (1--4, from highest to lowest) and the ratio between the 1st and 2nd slope (if present) are given.