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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >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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Diurnal and seasonal variation of B0,B1 parameters during high solar activity period at low mid-latitude and their comparisons with IRI-2001 model

机译：中低纬度高太阳活动期间B0，B1参数的昼夜变化及其与IRI-2001模型的比较

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摘要

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 10 LT. 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 10 LT to about 16 LT, 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.
机译：在新德里中低纬度站（28.6°N，77.2）使用现代数字电离探空仪观测数据，研究了代表底面F2层厚度和形状的底面电子密度分布形状参数B0，B1的日变化和季节变化。 °E，倾角42.4°N）以实现高太阳活动（HSA）（2001-2002年）。这些参数的中值是在不同季节的每个小时获得的，并使用两个选项（即IRI（Gulyaeva）和IRI（B0选项卡））与国际参考电离层（IRI），IRI-2001模型的最新版本的预测值进行比较。 ）。结果通常显示，在所有季节中，B0和B1参数的变化很大，夜间的变化大于白天的变化。通常，中位数B0的日变化显示出或多或少的类似趋势，中午前后出现日最大值，除了夏季在09到10 LT之间。通常，B1的变化模式在所有季节都是相同的，白天的B1值要比夜晚的低。 B0与通过IRI模型获得的B0的比较研究表明，总体而言，IRI（B0表）选项显示了在整个时间段（从本地时间10 LT到大约16 LT）在所有季节中的观测结果更好地吻合IRI（Gulyaeva）与观察结果非常吻合。使用IRI（B0 Tab。）预测的B1参数在日变化上与观测值接近，而使用IRI（Gulyaeva）选项的B1在所有本地时间均假定固定值为3，与季节无关。

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