Publication Date:
2017-04-04
Description:
We analyze data recorded from October 2010 to September 2011, during the ascending
phase of the 24th solar cycle, from an Advanced Ionospheric Sounder-Istituto Nazionale di Geofisica e Vulcanologia ionosonde and a GPS Ionospheric Scintillation and total electron
content (TEC) monitor scintillation receiver, colocated at low latitude in the Southern American longitudinal sector (Tucumán, 26.9°S, 294.6°E, magnetic latitude 15.5°S, Argentina). The site offers the opportunity to perform spread-F and GPS scintillation statistics of occurrence under the southern crest of the equatorial ionospheric anomaly.
Spread-F signatures, classified into four types (strong range spread-F (SSF), range spread-F, frequency spread-F (FSF), and mixed spread-F), the phase and amplitude scintillation index (σΦ and S4, respectively), the TEC, and the rate of TEC parameter, marker of the TEC gradients, that can cause scintillations, are considered. The seasonal behavior results as follows: the occurrence of all four types of spread-F is higher in summer and lower in winter, while the occurrence of scintillations peaks at equinoxes in the postsunset sector
and shows a minimum in winter. The correspondence between SSF and scintillations
seems to be systematic, and a possible correlation between S4 and FSF peaks is
envisaged at the terminator. The investigation focused also on two particular periods, from 12 to 16 March 2011 and from 23 to 29 September 2011, both characterized by the simultaneous presence of SSF signatures and scintillation phenomena, allowing to discuss the role of traveling ionospheric disturbances as a strong candidate causing ionospheric irregularities.
Description:
Published
Description:
4483–4502
Description:
1.7. Osservazioni di alta e media atmosfera
Description:
3.9. Fisica della magnetosfera, ionosfera e meteorologia spaziale
Description:
JCR Journal
Description:
restricted
Keywords:
equatorial ionosphere
;
scintillation
;
spread-F
;
01. Atmosphere::01.02. Ionosphere::01.02.05. Wave propagation
;
01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques
;
01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations
;
05. General::05.07. Space and Planetary sciences::05.07.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
