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  • 1
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    Multi-instrumental analyses of the September 2017 space weather storm over Brazil (2020)
    Details
    Publication Date: 2020-04-30
    Description: Brazil is a region of the Earth daily affected by strong ionospheric variability that may exacerbate during space weather events. In this paper, the ionospheric response to the solar storms that occurred in the first half of September 2017 is analyzed in terms of scintillation and TEC data from ground-based GNSS, ionospheric parameters from ionosondes and in-situ electron density data provided by the ESA Swarm mission. The result shows the complexity of the equatorial ionospheric dynamics under severe geospatial perturbations highlighting the occurrence of a super fountain event during daytime as the effect of a severe geomagnetic storm.
    Description: TREASURE Project funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Actions grant agreement No 722023.
    Description: Published
    Description: New Delhi, India, India
    Description: 2A. Fisica dell'alta atmosfera
    Keywords: Severe geomagnetic storm
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 2
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    A measure of ionospheric irregularities: zonal velocity and its implications for L-band scintillation at low-latitudes (2021)
    Science Press
    Details
    Publication Date: 2021-11-26
    Description: We estimate the zonal drift velocity of small-scale ionospheric irregularities at low latitude by leveraging the spaced-receivers technique applied to two GNSS receivers for scintillation monitoring installed along the magnetic parallel passing in Presidente Prudente (Brazil, magnetic latitude 12.8°S). The investigated ionospheric sector is ideal to study small-scale irregularities, being located close to the expected position of the southern crest of the equatorial ionospheric anomaly. The measurement campaign took place between September 2013 and February 2014, i.e. equinox and summer solstice seasons under solar maximum, during which the probability of formation of small-scale irregularities is expected to maximize. We found that the hourly average of the velocity increases up to 135 m/s right after the local sunset at ionospheric altitudes and then smoothly decreases in the next hours. Such measurements are in agreement with independent estimations of the velocity made by the Incoherent Scatter Radar located at the Jicamarca Radio Observatory (magnetic latitude 0.1°N), by the Boa Vista Ionosonde (magnetic latitude 12.0°N), and by applying a recently-developed empirical regional short-term forecasting model. Additionally, we investigated the relationship with the percentage occurrence of amplitude scintillation; we report that it is exponentially dependent on the zonal velocity of the irregularities that cause it.
    Description: Published
    Description: 450–461
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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