We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Ionospheric Conductances Due To Electron and Ion Precipitations: A Comparison Between EISCAT and DMSP Estimates.
- Authors
Wang, Xin; Cai, Lei; Aikio, Anita; Vanhamäki, Heikki; Virtanen, Ilkka; Zhang, Yongliang; Luo, Bingxian; Liu, Siqing
- Abstract
Energetic particle precipitation is the major source of electron production that controls the ionospheric Pedersen and Hall conductances at high latitudes. Many studies use empirical formulas to estimate conductances. The particle precipitation spectra measured by the Defense Meteorological Satellite Program (DMSP) Special Sensor J are often used as the input to the empirical formulas. In this study, we evaluate the empirical formulas of ionospheric conductances during four different types of auroral precipitation conditions based on 63 conjugate events observed by DMSP and EISCAT. The conductances calculated from the DMSP data with the empirical formulas are compared with those based on EISCAT measurements with the standard equations. The best correlation between these two is found when the empirical Robinson formulas (Robinson et al., 1987, https://doi.org/10.1029/ja092ia03p02565) are used in the presence of diffuse electron precipitation without ions. In the presence of ion precipitation, the correlation coefficients are smaller, but the correlation improves when the Galand formulas (Galand & Richmond, 2001, https://doi.org/10.1029/1999ja002001) are used to estimate the contribution of ion precipitation to the conductances. We also found that pure ion precipitation can cause the increase of conductances up to 2–7 S for Pedersen and 2.5–10 S for Hall conductances, which is positively correlated with the auroral electrojet index. Overall, the empirical formulas applied to the DMSP particle spectra underestimate the ionospheric conductances. Key Points: Performance of the Robinson and Galand formulas with the input of Defense Meteorological Satellite Program (DMSP) measurements is evaluated during different auroral conditionsRobinson formulas with the DMSP data underestimate the conductances for electron precipitationUsing Galand formulas for ions together with Robinson formulas for electrons improves the conductance estimates for dusk diffuse precipitation
- Subjects
RICHMOND (Va.); METEOROLOGICAL satellites; ELECTRONS; ELECTRON sources; IONS; AURORAS
- Publication
Journal of Geophysical Research. Space Physics, 2024, Vol 129, Issue 2, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2023JA032354