We have measured the average radial (cell center to network boundary) profile of the continuum intensity contrast associated with supergranular flows using data from the Precision Solar Photometric Telescope (PSPT) at the Mauna Loa Solar Observatory (MLSO). After removing the contribution of the network flux elements by the application of masks based on Ca II K intensity and averaging over more...

The average properties of the network cells geometry and their temporal variations are investigated for quiet solar regions at the center of the solar disk. These regions were extracted from the daily Ca II K full-disk observations carried out at the Rome Observatory with the PSPT telescope during one year (from July 1996 to June 1997) at the beginning of Solar Cycle 23. We applied an automated...

Context. Various observatories around the globe started regular full-disk imaging of the solar atmosphere in the Ca II K line since the early decades of the 20th century. The archives made by these observations have the potential of providing far more detailed information on solar magnetism than just the sunspot number and area records to which most studies of solar activity and irradiance chan...

S everal biological processes related to metabolism and cell division are controlled by biochemical oscillators that underpin circadian clock systems. The function of such circadian oscillators is modulated by rhythmic, phosphorylation-dependent interactions between proteins of the clock system. The self-sustained circadian clocks oscillate through different phases characterized by distinct pho...