Table 2. Correlation coefficients (using Student’s t-test) between yearly averaged temperature at the 100-hPa level and sunspot number over the Delhi, Kolkata, Cochin, and Trivandrum stations. R _xy is statistically significant at the 5% significance level at Cochin and at the 1% significance level at Trivandrum; R _xy is not statistically significant at Delhi and Kolkata.

From: Influence of large-scale variations in convective available potential energy (CAPE) and solar cycle over temperature in the tropopause region at Delhi (28.3°N, 77.1°E), Kolkata (22.3°N, 88.2°E), Cochin (10°N, 77°E), and Trivandrum (8.5°N, 77.0°E) using radiosonde during 1980–2005