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First Results on E Region Irregularities From a 53 MHz Radar Experiment From Haringhata, India
Radio Science ( IF 1.6 ) Pub Date : 2021-07-03 , DOI: 10.1029/2021rs007289
Ashik Paul 1 , P. Pavan Chaitanya 2 , A. K. Patra 2 , P. Nandakumar 1 , Tanmay Das 1
Affiliation  

We present the first results on E region field-aligned irregularities (FAIs) observed using a 53 MHz radar experiment conducted from Ionosphere Field Station, Haringhata (geographic latitude 22.93°N; geographic longitude 88.5°E; magnetic dip angle 35.2°N) of University of Calcutta, a location just on the Tropic of Cancer and below the Equatorial Ionization Anomaly. Results show that the E region FAI echoes, which occur with signal intensity as high as 35 dB above noise, are mostly confined to altitudes of 90–120 km with daytime FAI being confined to 100 km. The FAI echoes are often found to occur in the form of descending echoing region that includes continuous, quasi periodic and discrete patches of echoes. The FAI echoes display large day-to-day variations and tend to occur more during the morning (06–09 IST) and evening (18–21 IST) with relative less occurrence during the noon and midnight. Doppler spectra are type-2 in nature with mean Doppler velocity in the range of −100–120 m s−1 and spectral width limited to 100 m s−1. While these characteristics are very similar to those of off-equatorial low latitudes and mid-latitudes, comparison of these results with those concurrently observed at Gadanki reveals remarkable difference in the echo occurrence, day-to-day variability and Doppler velocity, in spite of the small difference in ionospheric pierce points between these two stations. These results are discussed and the prospective of these observations in understanding the E region FAI over a convective active meteorological region is outlined.

中文翻译:

来自印度哈林哈塔的 53 MHz 雷达实验 E 区不规则性的初步结果

我们展示了使用从 Haringhata 电离层现场站(地理纬度 22.93°N;地理经度 88.5°E;磁倾角 35.2°N)进行的 53 MHz 雷达实验观测到的E区场对齐不规则性 (FAI)的第一个结果加尔各答大学,位于北回归线和赤道电离异常下方。结果表明,E区域 FAI 回波出现的信号强度高达噪声以上 35 dB,主要限于 90-120 公里的高度,白天 FAI 仅限于 100 公里。FAI 回波通常以下降回波区域的形式出现,包括连续的、准周期性的和离散的回波片。FAI 回波显示出较大的日常变化,并且往往在早上 (06-09 IST) 和晚上 (18-21 IST) 发生更多,中午和午夜发生的次数相对较少。多普勒频谱本质上是类型 2,平均多普勒速度在 -100–120 ms -1范围内,频谱宽度限制为 100 ms -1. 虽然这些特征与赤道外低纬度和中纬度的特征非常相似,但将这些结果与同时在 Gadanki 观测到的结果进行比较,揭示了回波发生、日常变化和多普勒速度的显着差异,尽管这两个站之间电离层穿透点的微小差异。讨论了这些结果,并概述了这些观测在了解对流活跃气象区域的E区 FAI 方面的前景。
更新日期:2021-07-22
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