Results 41 to 50 of about 711 (146)
Tests of Sunspot Number Sequences: 1. Using Ionosonde Data [PDF]
Solar Physics, 2016 More than 70 years ago it was recognised that ionospheric F2-layer critical frequencies $foF2$ had a strong relationship to sunspot number. Using historic datasets from the Slough and Washington ionosondes, we evaluate the best statistical fits of $foF2$ to sunspot numbers (at each Universal Time [UT] separately) in order to search for drifts and ...
Lockwood, M. +4 more
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GPS Radio Occultation Method for Ionosphere TEC Monitoring [PDF]
فصلنامه علوم و فناوری فضایی, 2013 In this paper GPS radio occultation has been introduced as a way to extract the electron density of the ionosphere. A GPS radio occultation occurs when a receiver on-board a LEO spacecraft tracks a GPS satellite as it sets or rises through the earth’s ...
Sh. Amiri, M. Fahami
doaj
Satellite Traces: Ionogram Signatures of Bottom‐Side Upwelling Structures ‐ A Simulation Study
Geophysical Research LettersSatellite Traces (STs) are the important ionogram signatures for the presence of upwellings in the bottom‐side ionosphere, which provide the necessary seed perturbation for the development of equatorial plasma bubbles (EPBs).
M. Ankita +6 more
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Assessment of Global Ionospheric Maps Performance by Means of Ionosonde Data
Remote Sensing, 2020 This work presents a new method for assessing global ionospheric maps (GIM) using ionosonde data. The method is based on the critical frequency at the F2 layer directly measured by ionosondes to validate VTEC (vertical total electron content) values from
Gabriel O. Jerez +4 more
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D- and F-Region Ionospheric Response to the Severe Geomagnetic Storm of April 2023
AtmosphereThis study investigates the impact on the Earth’s ionosphere of a severe geomagnetic storm (Dst ∼ −212 nT) that began on 23 April 2023 at around 17:37 UT according to very low-frequency (VLF, 3–30 kHz) or low-frequency (LF, 30–300 kHz) radio signals and ...
Arnab Sen +3 more
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Учёные записки Казанского университета: Серия Физико-математические науки, 2017 To analyze midlatitude medium-scale traveling ionospheric disturbances (MSTIDs), the sufficiently dense network of GNSS receivers (more than 150 ground-based stations) have been used. For the first time, daytime MSTIDs in the form of their main signature
R.O. Sherstyukov, A.D. Akchurin
doaj
Учёные записки Казанского университета: Серия Физико-математические науки, 2019 One approach to determining the height structure of the mid-latitude medium-scale travelling ionospheric disturbances (MSTIDs) above the F layer peak is to involve simultaneous satellite measurements in the ground-based ionosonde measurements near Kazan.
A.D. Akchurin, G.S. Smirnov
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Remote Sensing, 2018 The height of F2 peak (hmF2) is an essential ionospheric parameter and its variations can reflect both the earth magnetic and solar activities. Therefore, reliable prediction of hmF2 is important for the study of space, such as solar wind and extreme ...
Andong Hu, Kefei Zhang
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Ionosondes: Past, present and future
, 2012 Previously curated at: http://cedadocs.ceda.ac.uk/934/ Event type: other. The publish date on this item was its original completed date. This item was previously associated with content (as an official url) at: http://www.stfc.ac.uk/RALSpace/News+and+events/RAL+Celebrates+50+Years+of+Space/11055.aspx. This work was funded by: RAL Space.
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ROSE: a high performance oblique ionosonde providing new opportunities for ionospheric research
Annals of Geophysics, 1994 A high quality high frequency (HF) oblique ionosonde has been developed for use in propagation research and associated studies of the ionosphere. The ionosonde is known as ROSE (radio oblique sounding equipment) and requires the connection of a specially
P. S. Cannon, P. C. Arthur
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