scholarly journals Role of the QBO in modulating the influence of the 11 year solar cycle on the atmosphere using constant forcings

2010 ◽  
Vol 115 (D18) ◽  
Author(s):  
Katja Matthes ◽  
Daniel R. Marsh ◽  
Rolando R. Garcia ◽  
Douglas E. Kinnison ◽  
Fabrizio Sassi ◽  
...  
Keyword(s):  
Solar Cycle

scholarly journals MANIFESTATION OF SOLAR ACTIVITY AND DYNAMICS OF THE ATMOSPHERE IN VARIATIONS OF 577.7 AND 630.0 nm ATMOSPHERIC EMISSIONS IN SOLAR CYCLE 24

2020 ◽  
Vol 6 (3) ◽  
pp. 81-85
Author(s):  
Aleksandr Mikhalev
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Atomic Oxygen ◽  
Correlation Coefficients ◽  
Atmospheric Emissions ◽  
Annual Average ◽  
Solar Cycle 24 ◽  
Cycle 24 ◽  
Activity Indices

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.

Study of Interplanetary CMEs/Shocks During Solar Cycle 24 Using Drag-Based Model: The Role of Solar Wind

Solar Physics ◽  
2019 ◽  
Vol 294 (4) ◽  
Author(s):  
K. Suresh ◽  
S. Prasanna Subramanian ◽  
A. Shanmugaraju ◽  
Bojan Vršnak ◽  
S. Umapathy
Keyword(s):  
Solar Wind ◽  
Solar Cycle ◽  
Solar Cycle 24 ◽  
Cycle 24

scholarly journals Simulating the atmospheric response to the 11-year solar cycle forcing with the UM-UKCA model: the role of detection method and natural variability

2018 ◽  
Author(s):  
Ewa M. Bednarz ◽  
Amanda C. Maycock ◽  
Paul J. Telford ◽  
Peter Braesicke ◽  
N. Luke Abraham ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Climate Model ◽  
Detection Method ◽  
Linear Regression Method ◽  
Data Sets ◽  
Atmospheric Response ◽  
Atmospheric Variability ◽  
Active Season ◽  
Atmospheric Forcings

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.).

scholarly journals The role of the oceans in shaping the tropospheric response to the 11 year solar cycle

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

scholarly journals The Contribution of Geomagnetic Activity to Ionospheric foF2 Trends at Different Phases of the Solar Cycle by SWM

Atmosphere ◽  
2020 ◽  
Vol 11 (6) ◽  
pp. 616
Author(s):  
Haimeng Li ◽  
Jing-Song Wang ◽  
Zhou Chen ◽  
Lianqi Xie ◽  
Fan Li ◽  
...  
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Geomagnetic Activity ◽  
Temporal Variability ◽  
Solar Minimum ◽  
Time Lag ◽  
Maximum Level ◽  
Ionospheric Perturbations ◽  
Geomagnetic Activities

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.

THE ROLE OF NITROGEN IN TITAN’S UPPER ATMOSPHERIC HYDROCARBON CHEMISTRY OVER THE SOLAR CYCLE

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

scholarly journals Separating the role of direct radiative heating and photolysis in modulating the atmospheric response to the amplitude of the 11-year solar cycle forcing

2019 ◽  
Vol 19 (15) ◽  
pp. 9833-9846
Author(s):  
Ewa M. Bednarz ◽  
Amanda C. Maycock ◽  
Peter Braesicke ◽  
Paul J. Telford ◽  
N. Luke Abraham ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Heating Temperature ◽  
Radiative Heating ◽  
Dynamical Response ◽  
Atmospheric Response ◽  
Active Season ◽  
Photolysis Rates ◽  
Induced Changes ◽  
The Tropics

Abstract. The atmospheric response to the 11-year solar cycle is separated into the contributions from changes in direct radiative heating and photolysis rates using specially designed sensitivity simulations with the UM-UKCA (Unified Model coupled to the United Kingdom Chemistry and Aerosol model) chemistry–climate model. We perform a number of idealised time-slice experiments under perpetual solar maximum (SMAX) and minimum conditions (SMIN), and we find that contributions from changes in direct heating and photolysis rates are both important for determining the stratospheric shortwave heating, temperature and ozone responses to the amplitude of the 11-year solar cycle. The combined effects of the processes are found to be largely additive in the tropics but nonadditive in the Southern Hemisphere (SH) high latitudes during the dynamically active season. Our results indicate that, in contrast to the original mechanism proposed in the literature, the solar-induced changes in the horizontal shortwave heating rate gradients not only in autumn/early winter but throughout the dynamically active season are important for modulating the dynamical response to changes in solar forcing. In spring, these gradients are strongly influenced by the shortwave heating anomalies at higher southern latitudes, which are closely linked to the concurrent changes in ozone. In addition, our simulations indicate differences in the winter SH dynamical responses between the experiments. We suggest a couple of potential drivers of the simulated differences, i.e. the role of enhanced zonally asymmetric ozone heating brought about by the increased solar-induced ozone levels under SMAX and/or sensitivity of the polar dynamical response to the altitude of the anomalous radiative tendencies. All in all, our results suggest that solar-induced changes in ozone, both in the tropics/mid-latitudes and the polar regions, are important for modulating the SH dynamical response to the 11-year solar cycle. In addition, the markedly nonadditive character of the SH polar vortex response simulated in austral spring highlights the need for consistent model implementation of the solar cycle forcing in both the radiative heating and photolysis schemes.

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