Magnetic activity (Kp) and quasi-periodic variations of intensity of the oxygen green and red lines

The association between magnetic activity (K_p) and quasi-periodic variations of intensity of the oxygen green and red lines is studied. It is found that, when K_p is greater, the association between K_p and quasi-periodic intensity variations is generally better. It is suggested that some relationship exists between quasi-periodic intensity variations of nightglow emissions and the activity of travelling ionospheric disturbances or magnetospheric substorms.