Solar quasi-biennial oscillations (QBOs) with the time scale of 0.6–4 yrs appear to be a basic
feature of the Sun's activity. Observational aspects of QBOs are reviewed on the basis of …

Rossby waves are a pervasive feature of the large-scale motions of the Earth's atmosphere
and oceans. These waves (also known as planetary waves and r-modes) also play an …

Apart from the eleven-year solar cycle, another periodicity around 155–160 days was
discovered during solar cycle 21 in high-energy solar flares, and its presence in sunspot …

We present the results of an extensive time series analysis of longitudinally-averaged
synoptic maps, recorded at the National Solar Observatory (NSO/Kitt Peak) from 1975 to …

Rossby waves arise in thin layers within fluid regions of stars and planets. These global
wave‐like patterns occur due to the variation in Coriolis forces with latitude. In the past …

We present a nonlinear magnetohydrodynamic shallow-water model for the solar tachocline
(MHD-SWT) that generates quasi-periodic tachocline nonlinear oscillations (TNOs) that can …

In this paper, the data of sunspot areas recorded at the US Air Force National Oceanic and
Atmospheric Administration during solar Cycles 22 and 23 (1986 September 1 to 2007 …

The recent solar cycles 23 and 24 are thought to be unusually quiet with more prolonged
periods. Both sunspot groups and solar soft X-ray (SXR) flares show a decline in numbers …

The periodic analyses of solar flare data have been carried out by different authors for about
three decades. Controversial results appear as depending on the analysis techniques and …

In this paper we study the quasi-periodic variations of sunspot area/number, 10.7 cm solar
radio flux, Average Photospheric Magnetic Flux, interplanetary magnetic field (B z) and the …