@Article{Abdu:2019:DaShVa,
author = "Abdu, Mangalathayil Ali",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Day-to-day and short-term variabilities in the equatorial plasma
bubble/spread F irregularity seeding and development",
journal = "Progress in Earth and Planetary Science",
year = "2019",
volume = "6",
number = "1",
pages = "e11",
month = "Dec.",
keywords = "Equatorial ionosphere, Plasma bubbles/spread F irregularities,
Prereversal vertical drift, Prompt penetration electric field,
Gravity waves, Trans-equatorial wind, Planetary/Kelvin waves,
ESF/EPB short-term variability.",
abstract = "The background ionospheric conditions shaped by sunset
electrodynamic processes are responsible for the development of
equatorial plasma bubble (EPB)/equatorial spread F (ESF)
irregularities of the post-sunset ionosphere. Distinct conditions
exist for the EPB/ESF development also at later hours of the
night. The plasma instability growth leading to EPB generation is
dependent on the basic precursor conditions defined by the
well-known parameters: the evening prereversal enhancement in
vertical plasma drift (PRE), wave structure in plasma density and
polarization electric field required to initiate/seed the
instability, and the F layer bottom side density gradient, as a
significant factor in controlling the growth rate. Competing roles
of the zonal versus meridional thermospheric winds additionally
control their development. Statistical as well as case studies
have addressed aspects of the EPB development and occurrence under
different geophysical conditions, generally focusing attention on
any one of the above specific parameters. Little is known
regarding the relative importance of concurrent presence of the
precursor parameters (mentioned above) in shaping a given event. A
large degree of day-to-day variability in these parameters arise
from different sources of forcing, such as upward propagating
atmospheric waves, and magnetic disturbance time electric fields
in the form of prompt penetration and disturbance dynamo electric
fields that often contribute to the widely observed short-term
variabilities in EPB development and dynamics. In this paper, we
will present and discuss some important aspects of the EPB/ ESF
short-term variability, focusing attention on their enhanced
development, or suppression and, wherever possible, highlighting
also the relative roles of the precursor parameters in such
variability.",
doi = "10.1186/s40645-019-0258-1",
url = "http://dx.doi.org/10.1186/s40645-019-0258-1",
issn = "2197-4284",
language = "en",
targetfile = "abdu_day.pdf",
urlaccessdate = "02 maio 2024"
}