The effect of intense solar flares on total electron content (TEC) variability during the declining phase of solar cycle-24 is studied at the low-latitude station at Varanasi, India (Geog. Lat. 25.31° N, Geog. Long. 82.97° E, Geomag. Lat. 16.54° N, Geomag. Long. 157.09° E). In the present paper, we have chosen the intense solar flares that occurred during 9–13 March 2015, 1–2 January 2016, 12–14 February 2016, 6–8 August 2016, and 6–8 September 2017 in the solar cycle-24 period for which the data is available. Our results showed significant enhancements in TEC up to the order of 15 TECU during and after the solar flare events. We have also given a brief account of solar flare effect in TEC with and without geomagnetic disturbances, local time effects (solar zenith angle effects) and changing the location of the solar active region. In a few cases, our results revealed a delay in TEC response during the flare peak time as well as recovery time.

中文翻译：

---

强烈太阳耀斑对低纬度站瓦拉纳西TEC变化的影响

在印度瓦拉纳西的低纬度站（Geog. Lat. 25.31° N, Geog. Long. 82.97° E, Geomag. 北纬 16.54°, Geomag. 经. 157.09° E). 在本文中，我们选择了太阳活动周期中发生在2015年3月9-13日、2016年1月1-2日、2016年2月12-14日、2016年8月6-8日和2017年9月6-8日的强烈太阳耀斑—— 24 期间的数据可用。我们的结果表明，在太阳耀斑事件期间和之后，TEC 的显着增强高达 15 TECU。我们还简要说明了有和没有地磁扰动的 TEC 中的太阳耀斑效应、本地时间效应（太阳天顶角效应）和改变太阳活动区的位置。在少数情况下，