A revised reconstruction of monthly and new daily modulation parameter Phi (in MV) from ground-based cosmic ray data since 1964. The modulation parameter corresponds to the local interstellar spectrum (LIS) of cosmic rays as provided by Vos and Potgieter (2015) and parametrized cosmic ray yield function provided by Mishev et al. (2020) Full description of the procedure and the reference to these data can be found in: Väisänen, P., Usoskin, I. G., Koldobskiy, S. A., Kahkonen R. & Mursula K. (2023, in revision) Revised reconstruction of the heliospheric modulation potential for 1964–2022, Journal of Geophysical Research: Space Physics Vos, E.E., and M. S. Potgieter (2015), New modeling of galactic proton modulation during the minimum of solar cycle 23/24, Astrophys. J., 815, 119. doi:10.1088/0004-637X/815/2/119. Mishev, A. L., Koldobskiy, S. A., Kovaltsov, G. A., Gil, A., & Usoskin, I. G. (2020). Updated neutron-monitor yield function: Bridging between in situ and ground-based cosmic ray measurements. Journal of Geophysical Research: Space Physics, 125, e2019JA027433. https://doi.org/10.1029/2019JA027433

2023