The report presents stator core vibration and temperature analysis of slow-speed salient poles synchronous generator specifically at 100 Hz frequency. Hypothesis of the study states that stator core 100 Hz vibration varies depending on generator design, slot number, temperature, air gap and generation mode. To verify the hypothesis, measurements in different generation operation modes were taken for synchronous generator with rated data in March and November of 2014. Research design of the given study includes both analytical calculation of stator core vibration from electromagnetic forces and case study on site. Report will provide review of existing standards and publications for stator core vibration and temperature for hydropower generation units. Root causes for increased vibration at 100Hz will be discussed. Case study results will be presented for different operating modes, including no-load mode and modes with reactive power. Spectrum analysis and timeline charts will be used to present obtained data.