Diurnal and seasonal variation of B0,B1 parameters during high solar activity period at low mid-latitude and their comparisons with IRI-2001 model
Diurnal and seasonal variation of B0,B1 parameters during high solar activity period at low mid-latitude and their comparisons with IRI-2001 model
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DOI：
10.1016/j.jastp.2007.01.008
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发表时间：
2007-05
影响因子：
1.9
通讯作者：
N. Sethi;R. Dabas;Rupesh M. Das
中科院分区：
文献类型：
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作者：
N. Sethi;R. Dabas;Rupesh M. Das
利用新德里（28.6°N，77.2°E，倾角42.4°N）低中纬度站的现代数字电离层探测器观测资料，研究了2001-2002年高太阳活动（HSA）期间，代表底侧F2层厚度和形状的底侧电子密度剖面形状参数B 0，B1的日变化和季节变化。这些参数的中值在不同季节的每一个小时获得，并与最新版本的国际参考电离层（IRI），IRI-2001模型使用两个选项，即：IRI（Gulyaeva）和IRI（B 0表）的预测进行比较。结果表明，一般来说，在所有的季节，在B 0和B1参数的变化很大，夜间的变化比白天大。中值B 0的日变化，一般来说，表现出或多或少类似的趋势与日最大值出现在中午左右，除了在夏季，当它发生在09和10 LT。B_1的变化规律在所有季节基本相同，白天比夜间低。B 0与IRI模型的比较研究表明，一般情况下，IRI（B 0表）。选项显示更好的协议与观测在所有季节的当地时间从约10 LT到约16 LT，而在此时间段以外的IRI（Gulyaeva）与观测匹配良好。使用IRI预测的B1参数（B 0表）在日变化方面接近观测值，而使用IRI（Gulyaeva）选项的B1在所有当地时间假定固定值3，而不考虑季节。
Diurnal and seasonal variations of bottom side electron density profile shape parameters B0, B1, representing the bottom side F2-layer thickness and shape, are examined using modern digital ionosonde observations at a low-middle latitude station, New Delhi (28.6°N, 77.2°E, dip 42.4°N) for high solar activity (HSA) (2001–2002). Median values of these parameters are obtained at each hour during different seasons and compared with the predictions of the latest version of the international reference ionosphere (IRI), IRI-2001 model using both the options namely: IRI (Gulyaeva) and IRI (B0 Tab.). Results show in general, a large variability in B0, and B1 parameters during all the seasons, the variability is larger during nighttime than by daytime. The diurnal variation of median B0, in general, show more or less similar trends with diurnal maximum occurring around noontime, except during summer, when it occurs between 09 and 10LT. Variation pattern of B1 in general, is identical in all the seasons with lower values of B1 by daytime than by night. Comparative studies of B0 with those obtained with the IRI model show that in general, IRI (B0 Tab.) option reveals better agreement with the observations during all the seasons for local times from about 10LT to about 16LT, while outside this time period IRI (Gulyaeva) matches well with the observations. The predicted B1 parameter, using IRI (B0 Tab.) is close to observations in terms of diurnal variation, while B1 using IRI (Gulyaeva) option, assumes a fixed value of 3 at all local times irrespective of season.