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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Dual-spacecraft observation of large-scale magnetic flux ropes in the Martian ionosphere
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Dual-spacecraft observation of large-scale magnetic flux ropes in the Martian ionosphere

机译：Dual-spacecraft大规模的观察磁通在火星电离层绳索

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We here report the first dual-spacecraft detection of planetary flux ropes in the ionosphere of Mars. The Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS), on board Mars Express, can measure the magnetic field magnitude near the spacecraft. Typically, these measurements track the known crustal magnetic field strength very well; however, occasionally, MARSIS detects transient, intense magnetic fields that deviate significantly from the known crustal fields. Two such magnetic field enhancements occur in near-coincidence with flux rope detections by the Mars Global Surveyor Magnetometer and Electron Reflectometer, which provides vector magnetic field measurements, allowing us to clearly identify the enhancements as flux ropes. The flux ropes detected are quasi-stable for at least a half hour, have peak magnetic field strengths of ~50 and 90 nT, and are ~650-700 km in diameter. Both occur downstream of the region of strong crustal fields. In addition, MARSIS has detected 13 other magnetic enhancements over a 5 year period, which we infer to be flux ropes. These structures have peak field strengths up to 130 nT and measured horizontal dimensions of several hundred to over a thousand kilometers. They are clustered around the intense crustal fields in the southern hemisphere of Mars. The large spatial scale of these flux ropes distinguishes them from small-scale flux ropes, with diameters of tens of kilometers, that have been seen in the ionospheres of Venus and Mars. These large-scale flux ropes are believed to be caused by solar wind stretching and shearing of the Martian crustal fields.
机译：我们在这里报告第一dual-spacecraft检测行星的电离层通量绳火星。电离层(马西人),登上火星表达,可以测量磁场大小附近的宇宙飞船。测量跟踪已知的地壳磁场磁场强度非常好;马西人检测瞬态,强烈的磁场从已知的地壳明显偏离字段。发生在near-coincidence通量绳火星环球探测器的探测磁强计和电子反射计提供矢量磁场测量,让我们清楚地识别增强通量绳。准稳定态的至少半个小时,有高峰磁场的优势~ 50 - 90元,和~ 650 - 700公里直径。下游地区的强烈的地壳字段。磁增强在5年期间,我们推断通量绳。磁场强度峰值130 nT和测量水平维度的几百一千公里。强烈的地壳字段在南部火星半球。这些通量绳从区分开来小规模的通量绳,数万的直径公里,已经见过的金星和火星电离层。通量绳被认为是由太阳引起的风拉伸和剪切的火星地壳字段。

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