scholarly journals Role of observable nonlinearities in solar cycle modulation

Author(s):  
M. Talafha ◽  
M. Nagy ◽  
A. Lemerle ◽  
K. Petrovay
Keyword(s):  
2010 ◽  
Vol 115 (D18) ◽  
Author(s):  
Katja Matthes ◽  
Daniel R. Marsh ◽  
Rolando R. Garcia ◽  
Douglas E. Kinnison ◽  
Fabrizio Sassi ◽  
...  
Keyword(s):  

2020 ◽  
Vol 6 (3) ◽  
pp. 81-85
Author(s):  
Aleksandr Mikhalev

In the paper, variations of the night emission intensities in the 557.7 and 630 nm atomic oxygen lines [OI] in 2011–2019 have been analyzed. The analysis is based on data from the ISTP SB RAS Geophysical Observatory. The emission intensities are compared with atmospheric, solar, and geophysical parameters. High correlation coefficients between monthly average and annual average 630.0 nm emission intensities and solar activity indices F10.7 have been obtained. This suggests a key role of solar activity in variations of this emission in the period of interest. Variations of the 557.7 nm emission demonstrate to a greater extent the correlations of the stratospheric zonal wind (QBO.U30 index) with quasi-biennial oscillations. The causes of the weak dependence of the 557.7 nm emission intensity on solar activity in solar cycle 24 are discussed.


Solar Physics ◽  
2019 ◽  
Vol 294 (4) ◽  
Author(s):  
K. Suresh ◽  
S. Prasanna Subramanian ◽  
A. Shanmugaraju ◽  
Bojan Vršnak ◽  
S. Umapathy

2018 ◽  
Author(s):  
Ewa M. Bednarz ◽  
Amanda C. Maycock ◽  
Paul J. Telford ◽  
Peter Braesicke ◽  
N. Luke Abraham ◽  
...  

Abstract. The 11-year solar cycle forcing is recognised as a potentially important atmospheric forcing; however, there remain uncertainties in characterising the effects of the solar variability on the atmosphere from observations and models. Here we present the first detailed assessment of the atmospheric response to the 11-year solar cycle in the UM-UKCA chemistry-climate model using an ensemble of integrations over the recent past. Comparison of the model simulations is made with observations and reanalysis. Importantly, in contrast to the majority of previous studies of the solar cycle impacts, we pay particular attention to the role of detection method by comparing the results diagnosed using both a composite and a multiple linear regression method. We show that stratospheric solar responses diagnosed using both techniques largely agree with each other within the associated uncertainties; however, the results show that apparently different signals can be identified by the methods in the troposphere and in the tropical lower stratosphere. Lastly, we focus on the role of internal atmospheric variability on the detection of the 11-year solar responses by comparing the results diagnosed from individual model ensemble members (as opposed to those diagnosed from the full ensemble). We show overall agreement between the ensemble members in the tropical and mid-latitude mid-stratosphere-to-lower-mesosphere, but larger apparent differences at NH high latitudes during the dynamically active season. Our results highlight the need for long data sets for confident detection of solar cycle impacts in the atmosphere, as well as for more research on possible interdependence of the solar cycle forcing with other atmospheric forcings and processes (e.g. QBO, ENSO… etc.).


2013 ◽  
Vol 40 (24) ◽  
pp. 6373-6377 ◽  
Author(s):  
Stergios Misios ◽  
Hauke Schmidt
Keyword(s):  

Atmosphere ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 616
Author(s):  
Haimeng Li ◽  
Jing-Song Wang ◽  
Zhou Chen ◽  
Lianqi Xie ◽  
Fan Li ◽  
...  

Solar activity dominates the temporal variability of ionospheric properties, which makes it difficult to identify and isolate the effects of geomagnetic activity on the ionosphere. Therefore, the latter effects on the ionosphere are still unclear. Here, we use the spectral whitening method (SWM)—a proven approach to extract ionospheric perturbations caused by geomagnetic activity—to directly obtain, in isolation, the effects of geomagnetic activity. We study its contribution to the ionosphere for different phases of the solar cycle. The time lag between the solar and geomagnetic activities provides an opportunity to understand the contribution of geomagnetic activity to the perturbation of the ionosphere. The results suggest that this contribution to the ionosphere is significant when geomagnetic activity is at its maximum level, which usually happens in the declining phase of the solar cycle, but the contribution is very weak at the solar minimum and during the ascending phase. Then, by analyzing the contributions in different months, we find that the role of geomagnetic activity is larger around winter but smaller around summer.


2016 ◽  
Vol 823 (2) ◽  
pp. 163 ◽  
Author(s):  
A. Luspay-Kuti ◽  
K. E. Mandt ◽  
J. H. Westlake ◽  
S. Plessis ◽  
T. K. Greathouse

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