@Article{BravoSepulvedaMFUOVSCMTVMPRLS:2020:CoToEl,
author = "Bravo Sepulveda, Manuel Alejandro and Mart{\'{\i}}nez Ledesma,
Miguel and Foppiano, Alberto J. and Urra, Benjamin and Ovalle,
Elias and Villalobos, C. and Souza, Jonas Rodrigues de and
Carrasco, Enrique and Muñoz, Pablo R. and Tamblay, Luis and Vega
Jorquera, Pedro and Mar{\'{\i}}n, J. and Pacheco, R. and Rojo,
E. and Leiva, R. and Stepanova, Marina",
affiliation = "{Universidad de Concepci{\'o}n} and {Centro Interuniversitario de
F{\'{\i}}sica de la Alta Atm{\'o}sfera} and {Universidad de
Concepci{\'o}n} and {Universidad de Concepci{\'o}n} and
{Universidad de Concepci{\'o}n} and {Centro Interuniversitario de
F{\'{\i}}sica de la Alta Atm{\'o}sfera} and {Instituto Nacional
de Pesquisas Espaciais (INPE)} and {Universidad de
Concepci{\'o}n} and {Centro Interuniversitario de F{\'{\i}}sica
de la Alta Atm{\'o}sfera} and {Centro Interuniversitario de
F{\'{\i}}sica de la Alta Atm{\'o}sfera} and {Centro
Interuniversitario de F{\'{\i}}sica de la Alta Atm{\'o}sfera}
and {Centro Interuniversitario de F{\'{\i}}sica de la Alta
Atm{\'o}sfera} and {Centro Interuniversitario de F{\'{\i}}sica
de la Alta Atm{\'o}sfera} and {Centro Interuniversitario de
F{\'{\i}}sica de la Alta Atm{\'o}sfera} and {Centro
Interuniversitario de F{\'{\i}}sica de la Alta Atm{\'o}sfera}
and {Universidad de Santiago de Chile}",
title = "First report of an eclipse from chilean ionosonde observations:
comparison with total electron content estimations and the modeled
maximum electron concentration and its height",
journal = "Journal of Geophysical Research: Space Physics",
year = "2020",
volume = "125",
number = "9",
pages = "e2020JA027923",
month = "Sept.",
abstract = "The ionospheric responses to the total solar eclipse on 2 July
2019 over low latitudes in southern South America are presented.
Ionosonde observations were used within the totality path at La
Serena (LS: 29.9°S, 71.3°W) and at Tucum{\'a}n (TU: 26.9°S,
65.4°W) and Jicamarca (JI: 12.0°S, 76.8°W), with 85% and 52%
obscuration, respectively. Total electron content (TEC)
estimations over the South American continent were analyzed. The
ionospheric impact of the eclipse was simulated using the
Sheffield University Plasmasphere\‐Ionosphere Model (SUPIM)
at the Instituto Nacional de Pesquisas Espaciais (INPE). The
significant variability of the diurnal variations of the various
ionospheric characteristics over equatorial and low latitudes on
geomagnetically quiet days makes it difficult to unambiguously
determine the ionospheric responses to the eclipse. Nonetheless,
some specific issues can be derived, mainly using simulation
results. The E and F1 layer critical frequencies and densities
below 200 km are found to consistently depend on decreasing solar
radiation. However, the F1 layer stratification observed at both
TU and LS cannot be related to the eclipse or other processes. The
F2 layer does not follow the changes in direct solar radiation
during the eclipse. The SUPIM\‐INPE\‐modeled F
region critical frequency and TEC are overestimated before the
eclipse at LS and particularly at TU. However, these
overestimations are within the observed large
day\‐to\‐day variability. When an artificial
prereversal enhancement is added, the simulations during the
eclipse better reproduce the observations at JI, are qualitatively
better for LS, and are out of phase for TU. The simulations are
consistent with conjugate location effects.",
doi = "10.1029/2020JA027923",
url = "http://dx.doi.org/10.1029/2020JA027923",
issn = "2169-9402",
language = "en",
targetfile = "bravo-first.pdf",
urlaccessdate = "2024, Apr. 26"
}