Characterization of the M1 and M2 layers in the undisturbed Martian ionosphere at a variety of solar conditions with MAVEN ROSE

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
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引用次数: 0

Abstract

We utilize data from the MAVEN Radio Occultation Science Experiment (Withers et al., 2020) - with unprecedented coverage in solar zenith angle - to isolate the effects that local time and season induce on the photochemical ionosphere of Mars around solar minimum, leading to solar maximum. 185 out of the 1228 electron density profiles of the Martian undisturbed ionosphere collected by MAVEN ROSE between July 2016 and December 2022 show a distinct M1 layer below the M2 layer. We define undisturbed here as conditions when there are no solar events or dust storms to influence the ionosphere. This allowed us to study the behavior of both the M2 and M1 peak densities and altitudes as a function of solar zenith angle, and, for the first time, to be able to separate these trends by dusk and dawn local time, as well as by southern spring and summer versus southern fall and winter. We find that the M1 layer at small SZA can occur at altitudes lower than 100 km; that the peak altitudes and densities of both the M2 and M1 layers at dawn change more with season than they do at dusk; and that the M2 peak density decreases at a faster rate than the M1 with SZA.

利用 MAVEN ROSE 分析各种太阳条件下未受干扰的火星电离层中 M1 和 M2 层的特征
我们利用MAVEN射电掩星科学实验(Withers等人,2020年)的数据--前所未有的太阳天顶角覆盖范围--分离出太阳最小日前后当地时间和季节对火星光化学电离层的影响。在MAVEN ROSE于2016年7月至2022年12月期间收集的1228份火星未扰动电离层电子密度剖面图中,有185份显示M2层下有一个明显的M1层。我们在此将未受干扰定义为没有太阳活动或沙尘暴影响电离层的情况。这使我们能够研究 M2 和 M1 的峰值密度和高度与太阳天顶角的函数关系,并首次能够按照当地时间的黄昏和黎明,以及南方春季和夏季与南方秋季和冬季来区分这些趋势。我们发现,小日出角下的 M1 层可能出现在低于 100 公里的高度;黎明时分 M2 层和 M1 层的峰值高度和密度随季节的变化比黄昏时大;随着日出角的增大,M2 层峰值密度的下降速度比 M1 层快。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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