Abstract
Significant short-term variations of approximate to 1.7, approximate to 2.4, approximate to 2.8, approximate to 3.3, approximate to 3.8 days periods are found when high resolution data (five minutes average) of interplanetary electric field (Ey), south ward component of magnetic field (Bz) and geomagnetic index (AE) is subjected to wavelet analysis. The fourth, fifth, sixth sub harmonics of approximate to 27-day period, and few other short-term periods are significantly reported by Singh and Badruddin (Astrophys. Space Sci. 359:60, 2015a; Solar Phys. 290:3071, 2015b and Solar Phys. 294:27, 2019) in cosmic ray intensity, geomagnetic activity index and various solar wind plasma and field parameters. The reported and observed periods approximate to 6.8 day, approximate to 5.5 day, approximate to 4.4 day, approximate to 3.9 day, approximate to 3.4 day, approximate to 3.0 day, approximate to 2.8 day, approximate to 2.4 day, approximate to 2.2 day, approximate to 2.0 day, approximate to 1.9 day, approximate to 1.8 day; and approximate to 1.7 day are close to integral multiples of 1/4, 1/5, 1/6, 1/7, 1/8, 1/9, 1/10, 1/11, 1/12, 1/13, 1/14, 1/15 and 1/16 of one solar rotation period (approximate to 27.0 day), hence these periods could be sub harmonics of fundamental period (approximate to 27 day). If so, then these results lead to infer some sort of continuous simultaneous oscillations of active regions having integral multiple frequencies and varying amplitudes occurring on the solar disc.