Anomalous Electron Temperatures in the evening equatorial ionosphere. These are outputs of simulations from the semi-empirical SAMI2-PE (Varney et al. 2012) for the night of the 02 and 05 August 2011.
Author ORCID Identifier
NASA, National Aeronautics and Space Administration
Utah State University
NASA, National Aeronautics and Space Administration 80NSSC17K071
We use novel radar observations at the Jicamarca Radio Observatory to study the first observations of highly enhanced plasma temperatures in the evening equatorial ionosphere. These short-lived solstice evening events occurred following large upward plasma drifts and sharply reduced plasma densities. The electron temperatures increase during the 5-6 August 2011 moderate solar event reached peak values of about 1000 K near 350 km. Smaller electron temperature increases were observed to altitudes up to about 500 km. There were also smaller concurrent ion temperature enhancements. During the very low solar flux 20-21 January 2020 event, a peak electron temperature increase of about 700K occurred at an altitude of about 270 km. We also show that SAMI2-PE simulations using the measured vertical plasma drifts reproduce the main characteristics of the measured plasma densities and temperatures up to 300 km, but not at higher altitudes. These simulations indicate that the evening anomalous plasma heating below about 300 km is due to the decrease in the electron-ion cooling rate resulting from upward plasma drift driven decrease in the plasma density. Plasma transport and reduced cooling rate is a potential source of higher altitude heating.
Fejer, B. G., Hysell, D. L., & Navarro, L. A. (2021). Anomalous Electron Temperature Increases in the Evening Equatorial Ionosphere. Journal of Geophysical Research: Space Physics, 126(2). https://doi.org/10.1029/2020JA028728
Jicamarca Radio Observatory
See the README.txt file.
This work is licensed under a Creative Commons Attribution 4.0 License.
Fejar, B. G. (2020). Data from: Anomalous Electron Temperature. Utah State University. https://doi.org/10.26078/ZERJ-B751
Additional FilesREADME.txt (3 kB)
rates_02082011.txt (3 kB)
rates_05082011.txt (2 kB)
Te.txt (1 kB)
Ti.txt (1 kB)
Te_2D.txt (44 kB)