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20 March 2015 solar eclipse influence on sporadic E layer
Language
English
Obiettivo Specifico
1A. Geomagnetismo e Paleomagnetismo
2A. Fisica dell'alta atmosfera
1IT. Reti di monitoraggio e Osservazioni
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
10/56 (2015)
ISSN
0273-1177
Electronic ISSN
1879-1948
Publisher
Elsevier Science Limited
Pages (printed)
2064–2072
Issued date
2015
Subjects
Abstract
This paper shows how the solar eclipse occurred on 20 March 2015 influenced the sporadic E (Es) layer as recorded by the Advanced Ionospheric Sounder by Istituto Nazionale di Geofisica e Vulcanologia (AIS-INGV) ionosondes installed at Rome (41.8°N, 12.5°E) and Gibilmanna (37.9°N, 14.0°E), Italy. In these locations, the solar eclipse was only partial, with the maximum area of the solar disk obscured by the Moon equal to ~54% at Rome and ~45% at Gibilmanna. Nevertheless, it is shown that the strong thermal gradients that usually accompany a solar eclipse, have significantly influenced the Es phenomenology. Specifically, the solar eclipse did not affect the Es layer in terms of its maximum intensity, which is comparable with that of the previous and next day, but rather in terms of its
persistence. In fact, both at Rome and Gibilmanna, contrary to what typically happens in March, the Es layer around the solar eclipse time is always present. On the other hand, this persistence is also confirmed by the application of the height–time–intensity (HTI) technique. A detailed analysis of isoheight ionogram plots suggests that traveling ionospheric disturbances (TIDs) likely caused by gravity
wave (GW) propagation have played a significant role in causing the persistence of the Es layer.
persistence. In fact, both at Rome and Gibilmanna, contrary to what typically happens in March, the Es layer around the solar eclipse time is always present. On the other hand, this persistence is also confirmed by the application of the height–time–intensity (HTI) technique. A detailed analysis of isoheight ionogram plots suggests that traveling ionospheric disturbances (TIDs) likely caused by gravity
wave (GW) propagation have played a significant role in causing the persistence of the Es layer.
Type
article
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ASR-D-15-00358R1.pdf
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