Mid-latitude Spread F long-term occurrence characteristics as a function of latitude over Europe

Paul, Ashik; Haralambous, Haris; Singh, Abhay Kumar; Gulyaeva, T.L.; Панченко, В. А.

doi:10.1016/j.asr.2022.05.022

Cited by 6 publications

(15 citation statements)

References 43 publications

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“…Experimental evidence over the nighttime midlatitude ionosphere suggests a possible electrodynamical linkage between spread F with the occurrences of sporadic E (Es) layers. That was evident also on studies over Cyprus but also other stations over the European continent [6][7][8] . Mid-latitude backscatter studies over the last few years have shown the existence of enhanced electric fields inside patchy Es or spread Es layers.…”

Section: Introductionmentioning

confidence: 61%

“…In Figure 3(a-d), a higher occurrence of spread Es was noted during range spreading formation (~95%). This may indicate that zonal polarization fields that are set up inside spread Es map along the magnetic field lines to the F region to cause vertical plasma displacements at the bottom of the ionospheric F layer and thus contribute to the formation of spread F [6][7][8] . The seasonal occurrence rate of spread Es has been studied in Figure 4(a-d) and 90.8% of correlation was found between spread Es occurrence and the spread F formation in the summer solstices of 2010 to 2016 over Nicosia.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…To analyze the mid-latitude ionospheric disturbances responsible for the nighttime mid-latitude spread F in detail, the ROT was also measured from the above-mentioned receivers to characterize small scale or rapid variation in TEC correlated with MLDs. ROT(i) has been calculated as 7 :…”

Section: Methodsmentioning

confidence: 99%

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Aspects of traveling ionospheric disturbance effects over Cyprus

Paul,

Haralambous

2023

Ninth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2023)

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To investigate the dynamics of the nighttime ionosphere over the lower mid-latitude European station of Nicosia, Cyprus (35°N, 33°E geographic; magnetic dip. 29.38°N), ionograms recorded by the DPS-4D digisonde during the interval 2010-2016 have been analyzed thoroughly over magnetically quiet conditions to identify and characterize the nighttime spread F signatures. To establish the effect of different driving mechanisms on spread F within the framework of Perkins instability on a statistical basis, the spread F occurrence has been correlated with the presence of Traveling Ionospheric Disturbance (TID) wavefronts in the F region and/or the development of unstable sporadic E layers (spread Es) over the E region of the ionosphere. The presence of TID wavefronts in synchronism with spread F development has been identified by analyzing the GPS Rate of TEC Index (ROTI) fluctuation maps over the eastern Mediterranean nighttime ionosphere. Also, the association between the generation of spread Es layers prior to spread F development has been studied from the Height-time-intensity (HTI) analysis over the Nicosia Digisonde data. The results verify the systematic manifestation and therefore the significance of TID wavefronts and spread Es layers as triggering factors responsible for the seeding of spread F development over the lower European latitudes. A clear seasonal characteristic of spread F occurrence in synchronism with the presence of TID wavefronts and/or spread Es layers over the lower European midlatitudes is also established from 2010 to 2016. .

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Section: Introductionmentioning

confidence: 61%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

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Aspects of traveling ionospheric disturbance effects over Cyprus

Paul,

Haralambous

2023

Ninth International Conference on Remote Sensing and Geoinformation of the Environment (RSCy2023)

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“…On the other hand, frequency spreading is due to diffused echoes scattered from the ionosphere close to the zenith. Additionally, there is a notable latitudinal and longitudinal diversity in the occurrence of midlatitude spread F [28][29][30][31][32]. Past publications [28][29][30][31] indicate that latitudinal variability is recorded over different latitude sectors.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, there is a notable latitudinal and longitudinal diversity in the occurrence of midlatitude spread F [28][29][30][31][32]. Past publications [28][29][30][31] indicate that latitudinal variability is recorded over different latitude sectors. Shimazaki (1962) [33] investigated the global latitudinal distribution of spread F occurrence.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Rate of TEC Index and Spread F over European Ionosondes

Paul,

Rafi,

Haralambous

et al. 2024

Atmosphere

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One of the most popular indices for monitoring the occurrence and intensity of ionospheric L-band irregularities is the Rate of TEC Index (ROTI). Due to low TEC in the mid-latitude ionosphere, ROTI has received significantly less attention than the equatorial and polar ionosphere. On the other hand, spread F is an established ionogram irregularity signature. The present study aims to correlate ROTI and spread F activity over European Digisonde stations for a low-to-moderate solar activity year (2011). With a focus on the latitude-dependent occurrence, the analysis demonstrates that range spread F (RSF) has been identified for all notable ROTI (>0.15 TECU/min) cases which also coincide with MSTID activity over the stations, suggesting induced gravity waves or polarization electric fields as the driving mechanism for enhanced ROTI activity. The diurnal and seasonal features are also presented. Maximum irregularity occurrence was observed around the 45° N from 18:00 to 05:00 UT with the seasonal maximum occurrence in January. Over lower mid-latitude Digisonde stations (latitude < 45° N), the diurnal and seasonal occurrence was observed from 19:00 to 04:30 UT in July.

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