Large-scale jets in the magnetosheath and plasma penetration across the magnetopause: THEMIS observationsстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 4 октября 2016 г.
Аннотация:THEMIS multi-point observation of the plasma and magnetic fields, conducted 24simultaneously in the dayside magnetosheath and magnetosphere, were used to collect 646 large-scale 25magnetosheath plasma jets interacting with the magnetopause. The jets were identified as dense and 26fast streams of the magnetosheath plasma whose energy density is higher than that of the upstream 27solar wind. The jet interaction with the magnetopause was revealed from sudden inward motion of the 28magnetopause and an enhancement in the geomagnetic field. The penetration was determined as 29appearance of the magnetosheath plasma against the background of the hot magnetospheric particle 30population. We found that almost 60% of the jets penetrated through the magnetopause. Vast majority 31of the penetrating jets was characterized by high velocities V > 220 km/s and kinetic k > 1 that 32corresponded to a combination of finite Larmor radius effect with a mechanisms of impulsive 33penetration. The average plasma flux in the penetrating jets was found to be 1.5 times larger than the 34average plasma flux of the solar wind. The average rate of jet-related penetration of the magnetosheath 35plasma into the dayside magnetosphere was estimated to be ~1029 particles per day. The rate varies 36highly with time and can achieve values of 1.5*1029 particles per hour that is comparable with 37estimates of the total amount of plasma entering the dayside magnetosphere. 38Keywords: magnetosheath, plasma jets, magnetopause, plasma transport into the magnetosphere 39