TY JOUR TI Estimated nitric oxide density in auroras from ground-based photometric data KW nitric oxide KW ionosphere component densities KW auroras KW emission intensity KW modeling KW electron precipitation JO Solnechno-Zemnaya Fizika AU Dashkevich, Z.V. AU Ivanov, V.E. PY 2019 IS 5 PB INFRA-M Academic Publishing LLC.