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\begin{document}

\title{Quasi 6-Day Planetary Wave Oscillations in Equatorial Plasma Irregularities}



\author[1]{Nicholas Pedatella}%
\author[2]{Ercha Aa}%
\author[3]{Astrid Maute}%
\affil[1]{High Altitude Observatory, NSF National Center for Atmospheric Research}%
\affil[2]{Haystack Observatory, Massachusetts Institute of Technology}%
\affil[3]{Cooperative Institute for Research in Environmental Sciences, University of Colorado}%


\vspace{-1em}



  
  \date{May 23, 2024}


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\begin{abstract}
The influence of atmospheric planetary waves on the occurrence of
irregularities in the low latitude ionosphere is investigated using
Whole Atmosphere Community Climate Model with thermosphere-ionosphere
eXtension (WACCM-X) simulations and Global Observations of the Limb and
Disk (GOLD) observations. GOLD observations of equatorial plasma bubbles
(EPBs) exhibit a \textasciitilde{}6-8 day periodicity during
January-February 2021. Analysis of WACCM-X simulations, which are
constrained to reproduce realistic weather variability in the lower
atmosphere, reveals that this coincides with an amplification of the
westward propagating wavenumber-1 quasi-six day wave (Q6DW) in the
mesosphere and lower thermosphere (MLT). The WACCM-X simulated
Rayleigh-Taylor (R-T) instability growth rate, considered as a proxy of
EPB occurrence, is found to exhibit a \textasciitilde{}6-day periodicity
that is coincident with the enhanced Q6DW in the MLT. Additional WACCM-X
simulations performed with fixed solar and geomagnetic activity
demonstrate that the \textasciitilde{}6-day periodicity in the R-T
instability growth rate is related to the forcing from the lower
atmosphere. The simulations suggest that the Q6DW influences the
day-to-day formation of EPBs through interaction with the migrating
semidiurnal tide. This leads to periodic oscillations in the zonal
winds, resulting in periodic variability in the strength of the
prereversal enhancement, which influences the R-T instability growth
rate and EPBs. The results demonstrate that atmospheric planetary waves,
and their interaction with atmospheric tides, can have a significant
impact on the day-to-day variability of EPBs.~~~~~~~~%
\end{abstract}%



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