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  • 1
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    Triple splitting and z-rays in polar ionograms (2018)
    Details
    Publication Date: 2018-03-26
    Description: The theory of propagation in a direction almost parallel to the Earth’s magnetic field is reviewed, calculating the group refractive index of the ordinary ray in the presence of electron-neutral collisions. An electron density profile is estimated from the ordinary trace and is used to compute the z-ray trace. It is shown that this reconstruction can help to identify the rare cases of z-rays from among the numerous cases of duplicate ordinary traces, due to reflection from two different directions. Received 13 June 2014, accepted 10 December 2014
    Description: Published
    Description: 383-387
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Keywords: ionosonde, ionosphere, radio propagation ; 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Thunderstorm-related variations in the sporadic E layer around Rome (2019)
    Details
    Publication Date: 2019-09-24
    Description: Superposed epoch analysis (SEA) was used to study possibly statistically significant variations of the critical frequency (foEs) and virtual height (h’Es) of the sporadic E layer (Es) related to thunderstorm activity generated in the troposphere. The reference time for the SEA was the time of lightning strokes measured by theWorldWide Lightning Location Network at the ionosonde station of Rome (41.9◦N, 12.5◦E) during the year 2009. The results obtained reveal that: (a) a statistically significant decrease of foEs after the time of lightnings has been found for time windows of ±100 h; (b) the effects of thunderstorms on the ionosphere is larger when the thunderstorm approaches from the opposite direction to the mean neutral stratosphere–mesosphere wind flow; (c). a statistically significant decrease of foEs related to thunderstorms during nighttime was observed. No significant changes in foEs and hEs over the seasonal time scale as well as in the latter parameter in the three (a–c) cases related to thunderstorms.
    Description: Published
    Description: 261-270
    Description: 2A. Fisica dell'alta atmosfera
    Description: JCR Journal
    Keywords: Lightning discharge, Sporadic E- layer, Thunderstorm-ionosphere coupling, Superposed epoch analysis ; 01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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