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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Observations of Low-Latitude Traveling Ionospheric Disturbances by a 630.0-nm Airglow Imager and the CHAMP Satellite Over Indonesia
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Observations of Low-Latitude Traveling Ionospheric Disturbances by a 630.0-nm Airglow Imager and the CHAMP Satellite Over Indonesia

机译：观察低纬度电离层旅行630.0 nm的大气光成像和干扰CHAMP卫星在印尼

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摘要

We report the first comparison of ground and satellite measurements of low-latitude traveling ionospheric disturbances (TIDs). Three TID events were simultaneously observed by a 630.0-nm airglow imager and the CHAllenging Minisatellite Payload (CHAMP) satellite at Kototabang, Indonesia (geographic coordinates: 0.2° S, 100.3° E, geomagnetic latitude: 10.6° S). In 630.0-nm airglow images of all three events, there are clear southward-moving structures. Events 1 and 2 are a single pulse with horizontal scales of ~500-1,000 km. Event 3 shows five wave fronts with a horizontal scale size of 500-1,000 km. All three TIDs are medium-scale TIDs. Horizontal wavelengths of both airglow intensity at an average emission altitude of 250 km and CHAMP neutral density variations measured at 400 km are estimated by fitting a sinusoidal function to the observed data. The estimated horizontal wavelengths for airglow and neutral density data are 1,031 and 880 km for event 1 and 560 and 420 km for event 3, respectively. These values between airglow and CHAMP are comparable, suggesting both instruments are observing the same wave. For event 1, the CHAMP electron density mapped along the geomagnetic field line onto the airglow altitude does not show wave structure similar to the airglow variation. For events 2 and 3, the plasma density did not show wavy structures similar to the waves seen in the airglow image and CHAMP neutral density. These results suggest that the TIDs observed in airglow images are not caused by ionospheric plasma instability but by gravity waves in the thermosphere.
机译：我们报告第一个地面和比较卫星测量低纬度的旅行电离层扰动(tid)。同时观察到630.0纳米大气光成像和Minisatellite发起挑战在Kototabang卫星有效载荷(冠军),印度尼西亚(地理坐标:0.2°,100.3°E,地磁纬度:10.6°S)。在630.0海里大气光图像的所有三个事件,有明确southward-moving结构。是一个单脉冲和水平尺度~ 500 - 1000公里。水平扩展大小为500 - 1000公里。三个中等规模的tid tid。大气光强度的波长平均发射高度250公里和冠军中性密度变化以400公里通过拟合的正弦函数估计观测数据。波长大气光和中性密度数据事件1是1031和880公里,560年和420年分别为事件3公里。大气光和冠军之间的可比性,建议仪器都是观察相同的波。沿着地球磁场线密度映射在大气光高度不会显示波结构类似于大气光变化。事件2和3,等离子体密度没有显示波浪结构类似于海浪中看到大气光图像和冠军中性密度。结果表明,大气光的tid观察图片不是由电离层等离子体引起的不稳定但的重力波热大气层。

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