부산대학교 도서관

Here we examine properties of MeV electron microbursts to better understand their generation mechanisms. Using 15 years of data from Solar, Anomalous, Magnetospheric Particles Explorer/Heavy Ion Large Telescope, >1 MeV microburst repetition periods (time spacing between bursts) are examined and clear dependencies on Auroral Electrojet (AE), L shell, and magnetic local time (MLT) are discovered. Microburst repetition periods are shortest around 0–6 hr MLT and 4–5 L shell, and grow longer toward the day and afternoon sectors and larger L shells. Shorter repetition periods (<1 s) are also found to be more common during higher AE, while longer periods (>10 s) more common during quiet times. The microburst repetition period distributions are compared directly to those of rising tone chorus wave elements and found to be similar in the night, dawn and day MLT sectors, suggesting chorus wave repetition periods are likely directly controlling those of microburst precipitation. However, dusk‐side distributions differ, indicating that the dusk‐side microbursts properties may be controlled by other processes. Plain Language Summary: Looking at energetic electrons in Earth's magnetosphere from the Heavy Ion Large Telescope instrument on board the Solar, Anomalous, Magnetospheric Particles Explorer satellite helps us better understand the feature called microbursts. Microbursts are very rapid bursts of enhanced high‐energy electrons entering our atmosphere. In this study, we characterize the properties of the microbursts to understand when, and where they happen, what causes them, and what impact they might have. We do so by looking at factors such as their magnetic local time as well as their time separation. This study also compares these microbursts' results to previous chorus wave studies. Chorus waves have been thought to be related to microbursts and could be a cause for some of their properties. We discuss more about this correlation in the result section of this study. Key Points: The repetition period of MeV electron microbursts is studied for the first time using 15 years of Solar, Anomalous, Magnetospheric Particles Explorer/Heavy Ion Large Telescope dataMicroburst repetition periods are most often <1 s, and drop off as a power law moving to longer periodsRepetition periods show strong agreement with chorus wave element periodicities in all magnetic local time sectors except for the dusk sector [ABSTRACT FROM AUTHOR]