机译:First observational evidence of the modulation of the threshold height h'F-c for the occurrence of equatorial spread F by neutral composition changes
Vikram Sarabhai Space Ctr, Space Phys Lab, Trivandrum 695022, Kerala, India;
threshold height; Equatorial Spread F; O; N2; solar activity; THERMOSPHERIC MERIDIONAL WINDS; DAYGLOW; FIELD; DRIFT;