THE METEOR FLUX: IT DEPENDS HOW YOU LOOK
THE METEOR FLUX: IT DEPENDS HOW YOU LOOK
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流星通量：取决于你的外表
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发表时间：
2006
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通讯作者：
S. Franke
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作者：
L. Dyrud;K. Denney;J. Urbina;D. Janches;E. Kudeki;S. Franke
本文利用位于波多黎各萨利纳斯附近的50 MHz雷达观测资料，研究了e区电离层中镜面和非镜面流星轨迹的变化。观测时间为1998年和1999年Coqui II运动期间不同天的18:00 - 08:00 h AST [Urbina et al., 2000, Geophys.][j].中华医学杂志。27(2):2853-2856。雷达系统有两个子阵列，都在磁子午线平面上产生指向北方的波束，垂直于磁场，仰角约为41度。Coqui II雷达对来自流星轨迹的至少两种类型的回波敏感：(1)垂直于雷达波束方向的轨迹的镜面反射，以及(2)来自任意方向的轨迹的散射或非镜面反射。我们研究并比较了Coqui II雷达观测到的镜面回波和非镜面回波的日变化和季节变化。我们还将这些结果与阿雷西博430兆赫雷达的流星头回波观测结果进行了比较。我们利用这三种类型的流星回波的共同区域观测结果表明，镜面轨迹、非镜面轨迹和头部回波的日变化和季节变化并不等效。这些结果对通过镜面流星观测获得的全球流星质量通量估计的影响仍有待研究。
In this paper, we use radar observations from a 50 MHz radar stationed near Salinas, Puerto Rico, to study the variability of specular as well as non-specular meteor trails in the E-region ionosphere. The observations were made from 18:00 to 08:00 h AST over various days in 1998 and 1999 during the Coqui II Campaign [Urbina et al., 2000, Geophys. Rev. Lett. 27, 2853–2856]. The radar system had two sub-arrays, both produced beams pointed to the north in the magnetic meridian plane, perpendicular to the magnetic field, at an elevation angle of approximately 41 degrees.The Coqui II radar is sensitive to at least two types of echoes from meteor trails: (1) Specular reflections from trails oriented perpendicular to the radar beam, and (2) scattering, or, non-specular reflections, from trails deposited with arbitrary orientations. We examine and compare the diurnal and seasonal variability of echoes from specular and non-specular returns observed with the Coqui II radar. We also compare these results with meteor head echo observations made with the Arecibo 430 MHz radar. We use common region observations of these three types of meteor echoes to show that the diurnal and seasonal variability of specular trails, non-specular trails, and head echoes are not equivalent. The implications of these results on global meteor mass flux estimates obtained from specular meteor observations remains to be examined.