Sporadic potassium (K_s) and sodium (Na_s) layers were investigated using more than 1,500 h of simultaneous Na/K LIDAR data at São José dos Campos, Brazil (23.1°S, 45.9°W). These events were observed on more than 88% of the analyzed nights. Although Na and K are both alkali metals, their sporadic layers show different behaviors. The Na_s layers were in general 0.7 km wider and occurred ∼2 km higher than K_s layers. Moreover, the Na_s layers progression is faster than that of K_s layers not only in the process of reaching their maximum amplitude but also in terms of dissipation. Our study showed that most N_s events (80% of K_s layers and 90% of Na_s layers) have a strength factor of upto 5. Moreover, on average, K_s presented a strength factor ∼1.3 times stronger than that of Na_s. The relative frequency of occurrence for both K_s and Na_s layers exhibits an almost semiannual variation, with maxima in January/October and February/September, respectively. On the other hand, no similar variation was observed in the peak density or in the peak height. The peak density shows an annual variation, with a maximum occurring during winter for K_s events and a semiannual variation with a maxima occurring at the equinoxes for Na_s. Different seasonal behaviors were also seen in the peak height of the identified layers, with K_s presenting a semiannual variation with maxima around January/October, while an annual variation occurred in Na_s with lower layers occurring around winter.

中文翻译：

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同时观测巴西圣若泽杜斯坎普斯地区零星的钾和钠层（23.1°S，45.9°W）

在巴西圣何塞多斯坎普斯（23.1°S，45.9°W），使用超过1500小时的同时Na / K LIDAR数据，研究了零星的钾（K _s）和钠（Na _s）层。在超过88％的分析夜晚观察到了这些事件。尽管Na和K均为碱金属，但它们的零星层表现出不同的行为。Na _s层通常宽0.7 km，比K _s层高约2 km 。此外，钠_小号层级数比的K更快_小号层不仅在达到其最大振幅的过程，而且在散热方面。我们的研究表明，大多数N _s事件（K _s的80％层和90％的Na _s层的强度因子最高为5。此外，平均而言，K _s的强度因子比Na _s强1.3倍。K _s和Na _s层的相对出现频率几乎都呈半年度变化，最大值分别在1月/ 10月和2月/ 9月。另一方面，在峰密度或峰高上未观察到类似的变化。峰值密度示出了每年的变型中，与冬季对于K期间发生的最大_小号事件和与极大值在昼夜平分点的Na发生的半年度变化_小号。在确定层的峰值高度上还观察到不同的季节性行为，K _s呈现半年度变化，最大值出现在一月/十月左右，而Na _s出现年变化，而下层出现在冬季左右。