Bibliography
Notice:
|
Found 6 entries in the Bibliography.
Showing entries from 1 through 6
2022 |
This paper studies the response of the ionospheric parameters critical frequency (foF2), their height (hmF2), and Total Electron Content (TEC) at mid, low, and near-equatorial latitudes of the South American sector during the intense geomagnetic storm of 26 August 2018. The ionospheric response at the beginning of the main phase was different depending on latitude (in general, there were decreases in foF2 at near-equatorial and low latitudes and small increases at mid-latitudes). During the recovery, positive storm effects in foF2 and TEC were observed almost all day on 26 August 2018 overall the stations along all the latitudes and also on 27 August. The initial effects were possibly caused by a weak prompt penetration electric field while the enhanced ratio of thermosphere neutral composition i.e. [O]/[N2] was considered as the main cause for the positive storm effects during the recovery phase. Mansilla, Gustavo; Zossi, Marta; Published by: Advances in Space Research Published on: jan YEAR: 2022   DOI: 10.1016/j.asr.2021.08.002 |
2020 |
Mansilla, Gustavo; Zossi, Marta; Published by: Pure and Applied Geophysics Published on: |
In this paper, the critical frequency of F2 layer (foF2) and their peak height (hmF2) recorded at equatorial and low latitude stations of the South American sector were analyzed during the 19\textendash22 December 2015 geomagnetic storm period. We have observed initially decreases of foF2 at equatorial and low latitudes over the North crest of the equatorial ionization anomaly (EIA) and almost no effect over the South crest. These initial negative storm effects can be fully explained by the penetration of a westward electric field to low and equatorial latitudes. The positive storm effects that replaced the negative storm effects during the development of the main phase may have occurred possibly because of an intensification of the \textquotedblleftfountain effect\textquotedblright due to an increase of the upward vertical drift at equatorial latitudes. Changes in the O/N2 ratio (increases or decreases) may be the most probable cause for the positive and negative storm effects observed during the recovery. Published by: Advances in Space Research Published on: YEAR: 2020   DOI: 10.1016/j.asr.2019.09.025 |
In this article, we present a study of the perturbations occurring in the Earth’s environment on 7 October 2015. We use a multi-instrument approach, including space and ground Molina, Maria; Dasso, S; Mansilla, G; Namour, Jorge; Cabrera, Miguel; Zuccheretti, Enrico; Published by: Solar Physics Published on: YEAR: 2020   DOI: 10.1007/s11207-020-01728-7 |
2019 |
Published by: Advances in Space Research Published on: 06/2019 YEAR: 2019   DOI: 10.1016/j.asr.2019.02.009 |
2018 |
Ionospheric Response to the Magnetic Storm of 22 June 2015 A global study is made of the response of the total electron content of the ionosphere (TEC) to the geomagnetic storm occurred on 22 June 2015 (one of the strongest geomagnetic storms of the current Solar Cycle 24). Using data from 44 sites, a hemispheric comparison is made by considering high latitudes (\>\ 50\textdegree), middle latitudes (30\textdegree\textendash50\textdegree) and low latitudes (30\textdegreeN\textendash30\textdegreeS). The main features observed were: increases in TEC at high latitudes prior to the storm main phase, a considerable asymmetry of TEC response at middle and low latitudes of the Northern Hemisphere and the Southern Hemisphere and decreases at equatorial latitudes. The long duration enhancements in TEC were well correlated with increases in the O/N2 ratio but decreases in TEC had not associated decreases in the O/N2 ratio as occur with the decreases in the electron density. Besides, prompt penetration electric fields can play an important role in the equatorial and low-latitude ionosphere during main phase of the storm. Published by: Pure and Applied Geophysics Published on: 03/2018 YEAR: 2018   DOI: 10.1007/s00024-017-1741-5 |
1