Speaker
Description
The main aim of the SAMADHA project is to monitor the cosmic ray neutron
spectrum and dose at very high altitudes in the South Atlantic Anomaly
region during the maximum activity of the 25$^{th}$ solar cycle.
The experimental setup for this measurement consists of an Extended Bonner
Sphere System and a commercial Rem counter. A linear energy transfer
spectrometer to measure the electromagnetic part of the extensive
air showers, and a high-precision barometer to correct
the effect of the atmospheric pressure variations, complete the system.
The experiment is operated at the Chacaltaya Cosmic Ray Laboratory in
Bolivia,
5240 m above sea level, and can be remotely controlled via an Internet
connection.
The instruments have been collecting data almost continuously since March
2023, together with a 12NM-64 neutron monitor managed by the local
research group. This high energy neutron detector monitors variations in
the flux of cosmic rays, which can be used to identify the periods of most
intense solar activity.
We looked at some important Forbush Decreases that occurred in 2024 after
strong CMEs from the Sun searching for cross correlations in our data. In
this paper, we compare the neutron spectrum and dose measured during these
episodes with the spectrum measured during quieter periods.
| Collaboration(s) | The SAMADHA Collaboration |
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