Modeling of Ultraviolet Aurora Intensity Associated With Interplanetary and Geomagnetic Parameters Based on Neural Networks

Abstract

Solar wind high-energy particles enter earth's north and south poles regions along the geomagnetic field lines, colliding with atoms and molecules in the high-altitude atmosphere to excite aurora. These auroras mainly occur in the oval ring region centered on the Earth's magnetic poles, which is also named as "auroral oval" (Akasofu, 1964;Feldstein, 1963). The intensity and spatial position of the aurora ovals show the distribution of particle precipitation, which are important physical quantities in magnetosphere dynamics and space environment and have a dramatic influence on the magnetosphere, ionosphere and thermosphere. For example, particle precipitation will not only cause additional ionization in the high latitude ionosphere to absorb and disturb the radio propagation but also increase Joule heating to change the convection and composition of the atmosphere. The changes in atmospheric convection and composition will further cause ionospheric disturbances (Zhang & Paxton, 2008). Therefore, it is of great significance to establish an accurate auroral intensity model to understanding the particle energy input at high latitudes the simulation of

Asymmetric Distributions of Auroral Kilometric Radiation in Earth's Northern and Southern Hemispheres Observed by the Arase Satellite

“…Numerous works have emphasized the role of interplanetary magnetic field ( IMF ) in the magnetosphere ( Cowley, 1981;Haaland et al, 2007;Han et al, 2017Han et al, , 2018Hu et al, 2021;Østgaard et al, 2005;Saita et al, 2011 ). In the northern hemisphere, the occurrence rate ( 11.3% ) for By ≥ 10 nT is smaller than that ( 17.3% ) for By ≤ −10 nT.…”

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

“…Recently, statistical results have presented the asymmetric distributions of AKR based on observations of the Arase satellite (Xiao et al 2022). Previous numerous works have emphasized the importance of the interplanetary magnetic field (IMF) to the magnetosphere (Han et al 2017(Han et al , 2018Hu et al 2021). However, the occurrence patterns of AKR associated with IMF have not been reported so far.…”