| No. | Report | Ionospheric parameter | Solar indices | Best correlation | Period |
| 1 | Dabas et al. [73] | IEC | Solar EUV flux; S10.7cm flux and SSN | IEC with EUV flux | 1977-1980 |
| 2 | Gupta and Singh [74] | IEC | F10.7 solar flux | IEC with F10.7 flux | 1975-80 and 1986-89 |
| 3 | Chkraborty and Hajra [75] | TEC | F10.7 solar flux | TEC with F10.7 flux | 1979-90 |
| 4 | Kumar and Singh [81] | TEC | SSN; F10.7 solar flux | TEC with SSN (=−0.03) | 2007-2008 |
| 5. | Galav et al. [63] | TEC | F10.7 solar flux | TEC with F10.7 flux (=0.74) | 2005-2009 |
| 6. | Chauhan et al. [28] | TEC | EUV flux, F10.7 solar flux and SSN | TEC with F10.7 flux | 2006-2009 |
| 7. | Chakrabarty et al. [90] | TEC | F10.7 solar flux | TEC with F10.7 flux (=0.98) | 2005-2009 |
| 8. | Opio et al. [13] | TEC | F10.7 solar flux | TEC with F10.7 flux (=0.75) | 2011 |
| 9. | Rama Rao et al. [6] | TEC | EUV flux, F10.7 solar flux and SSN | TEC with F10.7 flux | 2004?2005 |
| 10. | Liu et al. [77] | TEC | EUV flux and F10.7 solar flux | TEC with EUVflux | 1998?2008 |
| 11. | Shimeis et al. [91] | TEC | SSN | TEC with SSN (=0.9) | 2002-2012 |
| 12. | Wu et al. [78] | TEC | F10.7 solar flux | TEC with F10.7 flux (=−0.09) | 1996-1997 |
| 13. | Zhao et al. [80] | TEC | F10.7 solar flux | TEC with F10.7 flux (positive) | 1996?2004 |
| 14. | Liu et al. [76] | TEC | F10.7 solar flux and SSN | TEC with SSN (=0.26) | 2006 |
| 15. | Wu et al. [79] | TEC | F10.7 solar flux | TEC with F10.7 flux (=0.87) | 1994?2003 |