Conveners
Talks 2: Solar and Upper Atmosphere
- Jennifer Cooper ()
The study of the sky characteristics plays a fundamental role for many astrophysical experiments and on-ground observations. In the field of solar physics, in particular for the observation of the solar corona, it is required to have a very low sky brightness value.
Currently the only place on Earth with the sky characteristics that allow a continuous coronagraphic measurements is at the...
We have developed a mobile neutron monitor (“Changvan”) with three neutron counters to investigate cosmic ray spectral variations via ship-borne latitude surveys. Because Earth’s magnetic field excludes cosmic rays below the local geomagnetic cutoff rigidity, which depends on magnetic latitude, the count rate due to atmospheric neutrons from cosmic ray showers vs. cutoff rigidity (i.e., the...
The flux of extraterrestrial material on Earth is dominated by sub-millimeter particles, however the mass distribution and absolute value of this cosmic dust flux at the Earth surface is still uncertain due to the difficulty to monitor both the collection efficiency and the exposure parameter (i.e. the area-time product in m$^2$.yr). Thanks to the exceptional conditions encountered in...
Ice cores yield information about astronomical phenomena as well as information about climate changes of the past. We applied time-series analyses to variations in nitrate ion concentrations in one segment of an ice core drilled at the Dome Fuji station in East Antarctica, corresponding to the historical period from AD 1600 to 1900. Our analyses revealed clear evidence of periodicities of ~ 11...
