North/South Hemispheric Periodicities in the > 25 MeV ${>}\,25\mbox{ MeV}$ Solar Proton Event Rate During the Rising and Peak Phases of Solar Cycle 24

North/South Hemispheric Periodicities in the > 25 MeV ${>}\,25\mbox{ MeV}$ Solar Proton Event Rate During the Rising and Peak Phases of Solar Cycle 24