S. V. Koldashov

Robust regression analysis of energy spectrum evolution in time for relativistic electron bursts in the Earth's magnetosphere

Various local geophysical phenomena, like thunderstorms and earthquakes can be the cause for particle precipitation from Earth radiation belt. Longitudinal particle drift period is known to be dependent from its energy, due to this fact: using particles energy spectrum data change in time, it is possible to determine distances between locations of precipitation and registration on board of satellite. Using results of numerical model calculations of longitudinal particle drift, the energy spectrum dynamics of particle burst electrons detected in satellite experiments ARINA (on board the Russian satellite Resurs-DK1) and VSPLESK (on board the International Space Station) have been analyzed. The robust regression method is proposed to be used for detection of burst electrons in data with high levels of background albedo electron fluxes. The research has shown that this method provides the way to increase signal to noise ratio in experimental data and achieve more precise burst precipitation area detection in compare to linear regression analysis.

The background conditions of the cosmic ray ion charge measurements in the MONICA experiment

The present contribution is dedicated to the investigation of the background conditions for cosmic ray ion ionization state measurements in MONICA experiment. The future experiment MONICA is aimed to study the cosmic ray ion fluxes from H till Ni in energy range 10-300 MeV/n. The experiment main scientific objective is the measurement of the ion ionization state, as well as elemental, isotope composition and energy spectra of Solar Energetic Particle (SEP), Anomalous (ACR) and Galactic (GCR) cosmic ray fluxes. The observation of the ion fluxes will be carried out with high acceptance multilayer semiconductor telescope-spectrometer MONICA installed onboard satellite. The satellite orbit parameters (circular, altitude is about 600 km, polar) were chosen for the realization of the unique method for the measurement of the charge state of the ions with energies >10 MeV/n based on the usage of the Earth magnetic field as a separator of ion charge. To realize the method of the geomagnetic separator it is necessary to detect ions in the Earth magnetosphere at geomagnetic L-shells L<6. At these L-shells the MONICA detectors will be loaded by the trapped energetic particles of the Earth’s outer and inner radiation belts. In present work we have carried out the analysis of the background particle fluxes taking into account the recent data of the satellite experiments and known AE-8, AP-8 models and elaborated the recommendations to improve the background conditions for the MONICA experiment.

The South Atlantic Anomaly drift on the proton flux data of satellite experiments

Dynamics of flux of high-energy charged particles trapped by geomagnetic field has been studied in this report. As is known Earth’s magnetic field changes in direction and magnitude, therefore the South Atlantic Anomaly (SAA) region drifts. Geographical distributions of proton flux (80100 MeV) were studied since 2007 to 2014 using data of the ARINA satellite experiment. The ARINA satellite experiment is designed to study the physics origin of high-energy charged particle variations and bursts. ARINA placed on Resurs-DK1 satellite, which launched in 2006 and is still operating. Detail analysis of the SAA drift was fulfilled. The SAA region (L=1.15-2.2) was divided on zones with 0.05 step value. Maximum of proton flux was determined for each zone. Position of maximum drifts in west direction, which corresponds to the dynamics of the geomagnetic field. Average velocity of SAA longitude drift is almost independent of the L-shell and has a value about 0.5 degrees a year.