Morphology of quantified ionospheric range spread-F over a wide range of midlatitudes in the Australian longitudinal sector

Hajkowicz, L.A.

doi:10.5194/angeo-25-1125-2007

Cited by 14 publications

(14 citation statements)

References 22 publications

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“…The longitudinal and latitudinal dependence of spread F generation has been well studied in the literature (Shimazaki, 1962;Singleton, 1968;Rastogi, 1977;Mwene et al, 2004;Hajkowicz, 2007;Bhaneja et al, 2009;Huang et al, 2011). Singleton (1968) investigated the seasonal variability of spread F with solar activity over a wide latitudinal extent.…”

Section: Discussionmentioning

confidence: 99%

“…Airglow observations with allsky cameras establish that the irregularity clouds become narrower with latitude on both sides of the magnetic equator (Weber et al, 1980). Several studies have been reported in literature devoted to plasma dynamics to determine the origin and the triggering mechanisms of midlatitude spread F (Fejer & Kelley, 1980;Bowman, 1990;Hajkowicz, 2007). Nevertheless, the role of neutral drivers responsible for plasma instability at nighttime midlatitude ionosphere are still unresolved issues in between sporadic E (Es) layers, TIDs and plasma density irregularities associated with Perkins instability.…”

Section: Introductionmentioning

confidence: 99%

“…He investigated seasonal and solar activity effects on spread F development with respect to latitude variation. Hajkowicz (2007) noted a sharp gradient of spread F occurrence along equatorward direction at the latitude range of 52°to 48°S. Huang et al (2009) presented the longitudinal aspect on the occurrence of spread F using the IRI model which, unfortunately, provides lower accuracy over African and Indian low latitude stations due to limited data sources.…”

Section: Introductionmentioning

confidence: 99%

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Multi-station investigation of spread F over Europe during low to high solar activity

Paul

Haralambous

Oikonomou

et al. 2018

J. Space Weather Space Clim.

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Spread F is an ionospheric phenomenon which has been reported and analyzed extensively over equatorial regions on the basis of the Rayleigh-Taylor (R-T) instability. It has also been investigated over midlatitude regions, mostly over the Southern Hemisphere with its generation attributed to the Perkins instability mechanism. Over midlatitudes it has also been correlated with geomagnetic storms through the excitation of travelling ionospheric disturbances (TIDs) and subsequent F region uplifts. The present study deals with the occurrence rate of nighttime spread F events and their diurnal, seasonal and solar cycle variation observed over three stations in the European longitude sector namely Nicosia (geographic Lat: 35.29 °N, Long: 33.38 °E geographic: geomagnetic Lat: 29.38 °N), Athens (geographic Lat: 37.98 °N, Long: 23.73 °E geographic: geomagnetic Lat: 34.61 °N) and Pruhonice (geographic Lat: 50.05 °N, Long: 14.41 °E geographic: geomagnetic Lat: 47.7 °N) during 2009, 2015 and 2016 encompassing periods of low, medium and high solar activity, respectively. The latitudinal and longitudinal variation of spread F occurrence was examined by considering different instability triggering mechanisms and precursors which past literature identified as critical to the generation of spread F events. The main findings of this investigation is an inverse solar cycle and annual temporal dependence of the spread F occurrence rate and a different dominant spread F type between low and high European midlatitudes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-station investigation of spread F over Europe during low to high solar activity

Paul

Haralambous

Oikonomou

et al. 2018

J. Space Weather Space Clim.

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“… Behnke [1979] used incoherent radar and identified plasma bands aligned from northwest to southeast, propagating to southwest, at Arecibo (Puerto Rico). Bowman [1992] used ionosondes in the Australian mid‐latitudes and verified the association between TIDs and mid‐latitude spread‐ F. GPS receivers have shown that the MSTIDs can introduce fluctuations on the TEC (Total Electronic Content) and raise scintillations on the GPS signals [ Ogawa et al , 2002; Hajkowicz , 2007]. The electrified nature of the TIDs has been observed with incoherent radar systems and satellites [ Miller et al , 1997; Saito et al , 1998].…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of the occurrence of medium‐scale traveling ionospheric disturbances over Brazilian low latitudes using OI 630.0 nm emission all‐sky images

Cândido

Pimenta

Bittencourt

et al. 2008

Geophysical Research Letters

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In this work we report a statistical analysis of the occurrence frequency of medium‐scale traveling ionospheric disturbances (MSTIDs) observed over Cachoeira Paulista (22.7°S, 45.0°W, −13.2° mag lat), Brazil. The optical signatures of the low‐latitude MSTIDs in the southern hemisphere observed in the OI 630.0 nm emission images can be a single dark band structure or alternating dark/light bands aligned in the northeast‐southwest direction and propagating towards northwest. Because this feature these events were also referred as thermospheric dark band structures. The statistical study is based on 28 events of MSTIDs observed during seven years of optical data, obtained during low, medium, and high solar activities, for geomagnetically quiet nights. We find that the occurrence frequency of the MSTIDs presents a maximum during low solar activity, decreasing during medium solar activity with no occurrences during high solar activity. Also, the occurrence rates are greater near the June‐solstice months.

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“…Look closer, and you will find a dynamic environment rife with disturbances spanning a wide range in amplitude/strength as well as in spatial/temporal scales. These include midlatitude spread F [e.g., Sastri , ; Soicher et al , ; Hajkowicz , ], sporadic E [e.g., Miller and Smith , ; Bowman , ; Pan and Tsunoda , ; Hysell and Burcham , ], transient meteor‐induced ion trails [e.g., Ellyett and Davies , ; McKinley and Webb , ; Elford , ], turbulent density fluctuations [ Cohen and Röttgering , ; Helmboldt et al , ], and a variety of wavelike perturbations, typically referred to with the catchall term, traveling ionospheric disturbances (TIDs).…”

Section: Introductionmentioning

confidence: 99%

Drift‐scan imaging of traveling ionospheric disturbances with the Very Large Array

Helmboldt

2014

Geophysical Research Letters

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This paper describes a method to use high‐precision specification of traveling ionospheric disturbances (TIDs) from a relatively compact array of sensors to yield high‐resolution images of TID substructure. In this case, the array is the Very Large Array (VLA) radio telescope in New Mexico. The technique begins with a combined temporal and spatial spectral analysis that boils the TID down to its basic components, namely, the amplitude and horizontal wavelength and velocity vector. The last of these is used with the known apparent motion of the observed cosmic source to recompute the horizontal positions of the ionospheric pierce points in the frame of the TID. The data are then binned within this TID reference plane and averaged to make an image. The method is applied to three distinct TIDs detected and characterized to high precision (≲10−3 total electron content unit (1 TECU = 1016 el m−2)) using VLA observations of cosmic sources below 1 GHz.

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Morphology of quantified ionospheric range spread-F over a wide range of midlatitudes in the Australian longitudinal sector

Abstract: Abstract. Ionograms from a standard vertical-incidence ionosonde chain (nine stations), obtained over a wide range of southern latitudes (in geom.lat. range: 23 • -52 • S), were digitally scanned at 5-min intervals at nighttime (

Cited by 14 publications

References 22 publications

Multi-station investigation of spread F over Europe during low to high solar activity

Multi-station investigation of spread F over Europe during low to high solar activity

Statistical analysis of the occurrence of medium‐scale traveling ionospheric disturbances over Brazilian low latitudes using OI 630.0 nm emission all‐sky images

Drift‐scan imaging of traveling ionospheric disturbances with the Very Large Array

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