METHOD FOR PROBING BORDERS OF AURORAL OVAL AND STATE OF THE EARTH'S MAGNETIC FIELD Russian patent published in 2023 - IPC G01W1/00 G01V3/40 

FIELD: geophysics; environmental monitoring.

SUBSTANCE: using at least one receiving device installed on at least one spacecraft located in an orbit intersecting the auroral ovals of the Earth, ion concentrations are recorded with a specified frequency in time. The change in concentration of the analysed ions along the orbit of the spacecraft with known or calculated coordinates is calculated. The received data and the data processing results are transmitted to the data receiving points and to the data processing centre. In the data processing centre, the position of the receiving devices and the projections of their trajectories onto the Earth’s surface in geographic and magnetic coordinates are calculated at each time point set for measurements. The characteristics of the auroral ovals are calculated using statistical models. The position and coordinates of the concentration extremes of the analysed ions are calculated along the orbit of the receiving devices in the zones of the statistical boundaries of the ovals. The position of the equatorial boundary of the auroral oval is fixed along the latitude of the middle of the zone of extreme values of the concentration of the analysed ion or ions along the trajectory of the receiving devices at high latitudes. The position of the latitude of the boundaries of diffuse auroras and the polar boundaries of the auroral oval is recorded along the trajectory of the receiving devices at the position of the base of the dome-shaped zones of extreme intensity of the recorded ion concentrations or at a distance of 2-4 degrees of latitude from the equatorial boundary. The intensity of the auroral oval is determined by the relative amplitude compared to statistical estimates of the extreme values of the concentration of the analysed ions. The spatial location of the boundaries of the auroral ovals is reconstructed using the obtained measurement data and statistical models of the auroral ovals. The state of the Earth's magnetic field is calculated by successive approximations of the position of the statistical boundaries of the auroral oval to the identified boundaries of the auroral oval at different values of magnetic activity, minimizing the discrepancy between the compared boundaries. Adaptive models of the boundaries of the auroral oval and the state of the Earth's magnetic field are formed based on long-term series of observations.

EFFECT: increasing the efficiency and accuracy of determining the characteristics of the auroral oval and the state of the Earth's magnetic field.

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