The eruption of the Hunga Tonga Hunga Ha’apai volcano on 15 January 2022 significantly impacted the lower and upper atmosphere globally. Using multi-instrument observations, we described disturbances from the sea surface to the ionosphere associated with atmospheric waves generated by the volcanic eruption. Perturbations were detected in atmospheric pressure, horizontal magnetic field, equatorial electrojet (EEJ), ionospheric plasma drifts, total electron content (TEC), mesospheric and lower thermospheric (MLT) neutral winds, and ionospheric virtual height measured at low magnetic latitudes in the western South American sector (mainly in Peru). The eastward Lamb wave propagation was observed at the Jicamarca Radio Observatory on the day of the eruption at 13:50 UT and on its way back from the antipodal point (westward) on the next day at 07:05 UT. Perturbations in the horizontal compon...

En este estudio nos centramos en la dinámica de las velocidades de deriva de iones en las latitudes bajas y medias. Se describe cómo estas derivas de iones varían en amplitud para diferentes longitudes, las estaciones y las horas locales específicos durante momentos de tranquilidad. Durante momentos de tranquilidad se utilizan los datos del satélite el ROCSAT-1 para describir la dependencia de latitud tres características principales de las derivas de iones meridional; las derivas a gran escala hacia arriba durante el día, una denominada mejora prereversal cerca de la oscuridad, y una mejora de la salida del sol hacia abajo. La longitud, latitud y dependencias de temporada en estas características se ven influenciadas por la alineación de los terminadores y el meridiano magnético, las conductividades tubo de flujo integrados y la acción de las mareas diurnas y semidiurnas en l...

Poster presented at the 2020 CEDAR Virtual Meeting, June 22-26.

Poster presented at the 2021 CEDAR Virtual Workshop, June 20-25.

This paper presents the interrelationship between the equatorial electrojet (EEJ) strength, Global Positioning System (GPS)‐derived total electron content (TEC), and postsunset scintillation from ground observations with the aim of finding reliable precursors of the occurrence of ionospheric irregularities. Mutual relationship studies provide a possible route to predict the occurrence of TEC fluctuation and scintillation in the ionosphere during the late afternoon and night respectively based on daytime measurement of the equatorial ionosphere. Data from ground based observations in the low latitudes of the west American longitude sector were examined during the 2008 solar minimum. We find a strong relationship exists between the noontime equatorial electrojet and GPS‐derived TEC distributions during the afternoon mediated by vertical E × B drift via the fountain effect, but the...

Statistical analysis of low latitude spread F is presented for three different longitudinal sectors from Jicamarca (12°S, 76.8°W, −2.5° declination angle) from 2001 to 2016, Ascension Island (7.9°S, 14.4°W, −15.09° declination angle) from 2000 to 2014, Kwajalein (8.71°N, 167.7°E, 7.5° declination angle) from 2004 to 2012. Digisonde data from these stations have been processed and analyzed to study statistical variations of equatorial spread F, a diagnostic of irregular plasma structure in the ionosphere. A new automated method of spread F detection using pattern recognition and edge detection for low latitude regions is used to determine solar and seasonal variation over these three sites. An algorithm has been developed to detect the foF2 and hpF2 parameters and this has been validated by comparisons with manually scaled data as well as with SAMI2 and International Referenc...