A Statistical and Numerical Study of Presunrise Equatorial F-region Irregularities in the American Sector
Abstract
This study reports some statistical results of the occurrence of presunrise equatorial spread F (ESF) in the American sector using radar measurements from Jicamarca. Our results show a higher occurrence rate of presunrise ESF in June solstice and low solar flux conditions compared to that in other seasons. The abnormal behavior of vertical plasma drift around sunrise hours under quiet conditions is hypothesed to play an important role in the generation of presunrise ESF. Further numerical analysis using Whole Atmosphere Community Climate Model With Thermosphere and Ionosphere Extension (WACCM-X) model confirms our hypotheses. Our analysis also indicates the importance of other factors such as thermosphere neutral winds in the generation of presunrise ESF.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMSA51B3137Z
- Keywords:
-
- 2415 Equatorial ionosphere;
- IONOSPHERE;
- 2431 Ionosphere/magnetosphere interactions;
- IONOSPHERE;
- 6969 Remote sensing;
- RADIO SCIENCE;
- 7944 Ionospheric effects on radio waves;
- SPACE WEATHER