Received: 28 Aug 2019 – Discussion started: 09 Sep 2019
Abstract. Day-to-day variability of the occurrence of plasma irregularities in low-latitude ionosphere is still an open issue. In this study, we report the occurrence of post-sunset plasma bubbles and blobs detected by the First satellite of the Republic of China (ROCSAT-1) in the same longitude sector (170° E) on two successive days, under geomagnetically quiet and disturbed conditions, respectively. Multi-Low Earth orbit (LEO) missions, like the Defense Meteorological Satellite Program (DMSP) F13 and F15, the Gravity Recovery and Climate Experiment (GRACE) and the Challenging Mini-satellite Payload (CHAMP) satellites are used to study the preferable conditions for the occurrence of plasma bubbles and blobs. The observations from the CHAMP and GRACE show that the Equatorial Ionization Anomaly (EIA) was enhanced significantly before the occurrence of plasma irregularities on both two successive days. We suggest that the enhancement of post-sunset eastward electric field is the most important factor for the day-to-day development of the plasma irregularity in equatorial and low-latitude ionosphere. In addition, the meridional neutral wind plays an important role in the occurrence of low-latitude plasma blobs.
How to cite. Luo, W., Xiong, C., Zhu, Z., Chang, S., and Yu, X.: A case study of the day-to-day occurrence of plasma irregularities in low-latitude ionosphere from multi-satellite observations, Ann. Geophys. Discuss. [preprint], https://doi.org/10.5194/angeo-2019-128, 2019.
The plasma bubbles and blobs were recorded on two successive days. The interesting is that one of the event occured in a quiet day, and the other in the main phase of a storm. The latitudinal variations of electron density at low- and middle ionosphere were used to analyze the physical factors leading to the variations in the F region and the occurrence of plasma bubbles and blobs. The work would help to understand the dominant factor accounting for the day-to-day occurrence of irregularities.
The plasma bubbles and blobs were recorded on two successive days. The interesting is that one...