Variations of ionospheric profile parameters during solar maximum and comparison with IRI-2007 over Chung-Li, Taiwan

Chuo, Y. J.

doi:10.5194/angeo-30-1249-2012

Cited by 18 publications

(2 citation statements)

References 39 publications

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“…where NmF2 is in [m −3 ] and foF2 in [MHz] (Davies, 1990;Chuo, 2012). In the present study, we mainly analyse the time series of NmF2.…”

Section: Introductionmentioning

confidence: 99%

Influences of sudden stratospheric warmings on the ionosphere above Okinawa

Hocke,

Wang,

2024

Preprint

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Abstract. We analyzed the ionosonde observations at Okinawa (26.7° N, 128.1° E) for the years from 1972 to 2023. Okinawa is at the border between the low latitude and the mid-latitude ionosphere. The inﬂuences of sudden stratospheric warmings (SSWs) on the ionosphere are strong at low latitudes but less obvious at middle and high latitudes. We divided the dataset into winters with major SSWs in the northern hemisphere (SSW years) and into winters without major SSWs (no SSW years). During the SSW years, the daily cycle of the F2 region electron density maximum (NmF2) was stronger than in the no SSW years. The relative NmF2 amplitudes of solar and lunar tidal components (S2, O1, M2, MK3) are stronger by 3 to 8 % compared to no SSW years. The semidiurnal amplitude, averaged for 29 SSW events, has a signiﬁcant peak at the central date of the SSW (epoch time 0 of the composite analysis). The SSW inﬂuence is not strong: the semidiurnal amplitude is about 38.2 % in SSW years and about 32.9 % in no SSW years (relative to NmF2 of the background ionosphere). However, there is a sharp decrease of the amplitude by about 10 % after the SSW peak was reached. The amplitude of the diurnal component does not show a single peak at the central date of the SSW. We present the maximal semidiurnal amplitudes of the SSWs since 1972. The SSW of 31 December 1984 has the strongest amplitude (162 %) in the ionosphere above Okinawa. The most surprising ﬁnding of the study are the strong lunar tides with relative amplitudes of about 10 % and the discovery of a terdiurnal lunar tide (5 %) in NmF2 during SSW years. The periods of the ionospheric lunar tides agree with the periods of ocean tides.

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“…where NmF2 is in [m −3 ] and foF2 in [MHz] (Davies, 1990;Chuo, 2012). In the present study, we mainly analyse the time series of NmF2.…”

Section: Introductionmentioning

confidence: 99%

Influences of sudden stratospheric warmings on the ionosphere above Okinawa

Hocke,

Wang,

2024

Preprint

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“…Many scholars utilize the measured data to evaluate the IRI model, refer to Refs. [33][34][35][36][37][38][39][40][41][42][43]. The literature includes the comparison between the IRI model and the site-measured data, in which the sites are mainly located in the equatorial ionization anomaly (EIA) edge region, and also the comparison with the International GNSS Service (IGS) vertical total electron content (VTEC) maps.…”

Section: Introductionmentioning

confidence: 99%

Research on Sea Surface Elliptical Current Remote Sensing With Single-Station Wide-Beam High-Frequency Sky–Surface Wave Radar

Feng,

Fang,

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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This paper describes a new elliptical current ( E ssw v − ) retrieval scheme for single-station wide-beam high-frequency skysurface wave radar, which focuses on solving the problem of locating scattering patches on the sea surface. To start with, the measured data of the Digisonde Portable Sounder (DPS) are exploited to correct the international reference ionosphere (IRI) model, which is capable of realizing the precise application of the IRI model to a certain extent. Subsequently, the scattering patches are located by combining the 3D ray tracing and the corrected IRI model, and the radio wave incidence angles are obtained to calculate the theoretical Bragg frequency. Finally, the large-area elliptical currents are retrieved on the basis of the correction of sea echoes with ionosphere phase contamination extracted from direct waves. The effectiveness of this scheme is verified by comparing E ssw v − with surface wave radar current products and by comparing with location algorithm under the plane ionosphere assumption. The main achieved results are as follows. The predicted value of E ssw v − by the location algorithm proposed in this paper is more accurate than that obtained from the plane ionosphere location algorithm. The directions of E ssw v − are in good agreement with the surface wave radar current product, and the root mean square error (RMSE) of E ssw v − is about 11.70 cm/s. In the detection core area, such an error is about 7.76 cm/s, and the scattering patches with smaller group paths exhibit higher retrieval accuracy of E ssw v − . The relative error of E ssw v − in the core area demonstrates an ascending trend in the local time interval of 9:32 ~ 10:29, revealing that the effectiveness of this scheme could be affected by the ionosphere disturbance.

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Assessment of bottomside thickness parameters over magnetic equator and low latitudes during high solar activity of solar cycle 24

Jamjareegulgarn

2020

Acta Astronautica

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Variations of ionospheric profile parameters during solar maximum and comparison with IRI-2007 over Chung-Li, Taiwan

Cited by 18 publications

References 39 publications

Influences of sudden stratospheric warmings on the ionosphere above Okinawa

Influences of sudden stratospheric warmings on the ionosphere above Okinawa

Research on Sea Surface Elliptical Current Remote Sensing With Single-Station Wide-Beam High-Frequency Sky–Surface Wave Radar

Assessment of bottomside thickness parameters over magnetic equator and low latitudes during high solar activity of solar cycle 24

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