Present Paper describes analysis of GPS-data recorded at low latitude station Hyderabad (Geographic latitude 17\(^\circ \), 25′ N, longitude 78\(^\circ \), 33′ E), India to study the effect of magnetic activity on ionospheric TEC. The total electron content (TEC) data were considered for the ionosphere during five most quiet and most disturbed days for each month of the solar minimum year 2009 and the high solar activity year 2013. The results show that GPS-TEC is found to be more during disturbed days than that during quiet days with a maximum difference during the equinox season. In addition, the difference in TEC during quiet and disturbed days is found to be higher for solar maximum than that for solar minimum year. Moreover the GPS-TEC variations depend on the season with the maximum in equinox season and minimum in summer and winter season. Generally daytime TEC is found to be larger than that in the nighttime which is maximized around the local noontime hour but the peak formation delayed for the solar minimum year. The EIA development process during the solar minimum is quite slow and occurs in late afternoon as compared to that during the high solar activity year. In addition, this delay is larger for summer and winter season than that for equinox months. The formation of post sunset anomaly in the post-sunset sector (1900–2300 LT) is prominent during high solar activity year 2013 whereas same is insignificant for solar minimum year 2009. The post-sunset anomaly could be attributed to pre-reversal enhancement (PRE) of zonal electric field.

本文描述了在低纬度海得拉巴站（地理纬度17 \（^ \ circ \），25'N，经度78 \（^ \ circ \）记录的GPS数据的分析。，33'E），印度研究磁活动对电离层TEC的影响。在2009年最低太阳年和2013年最高太阳活动年的每个月中，在五个最安静，最受干扰的日子里，对电离层的总电子含量（TEC）数据进行了研究。结果表明，发现GPS-TEC更为有效春分季节期间，受干扰的日子比安静的日子多，而安静的日子最多。另外，发现在安静和受干扰的日子里，TEC的差异在最大太阳日比在最小太阳年高。此外，GPS-TEC的变化取决于季节，春分季节最大，夏季和冬季最小。通常发现白天的TEC比夜间的TEC大，在当地的中午时间附近最大化，但峰值形成推迟了太阳的最小年份。与日照活跃的年份相比，在日照最小的时期，EIA发展过程相当缓慢，并且发生在下午晚些时候。此外，夏季和冬季的延迟比春分月份的延迟大。日落后地区（1900–2300 LT）日落后异常的形成在2013年高太阳活动年期间很明显，而对于2009年最低太阳年份则无关紧要。日落后异常可能归因于逆转前增强（ PRE）的区域电场。与日照活跃的年份相比，在日照最小的时期，EIA发展过程相当缓慢，并且发生在下午晚些时候。此外，夏季和冬季的延迟比春分月份的延迟大。日落后地区（1900–2300 LT）日落后异常的形成在2013年高太阳活动年期间很明显，而对于2009年最低太阳年份则无关紧要。日落后异常可能归因于逆转前增强（ PRE）的区域电场。与日照活跃的年份相比，在日照最小的时期，EIA发展过程相当缓慢，并且发生在下午晚些时候。此外，夏季和冬季的延迟比春分月份的延迟大。日落后地区（1900–2300 LT）日落后异常的形成在2013年高太阳活动年期间很明显，而对于2009年最低太阳年份则无关紧要。日落后异常可能归因于逆转前增强（ PRE）的区域电场。