Results 71 to 80 of about 950 (162)

An Automatic CADI’s Ionogram Scaling Software Tool for Large Ionograms Data Analytics

IEEE Access, 2022
Scale the ionosonde ionograms to produce accurate readings is a professional manual scaling technique. However, there is a high demand for auto-scaling software that can manage a large number of ionograms in order to avoid the time and effort involved in manual scaling as well as human errors.
T. Venkateswara Rao, M. Sridhar, D. Venkata Ratnam   +2 more
openaire   +1 more source

Can the polarization tagging of the ionogram trace deceive autoscaling methods? The Learmonth case

Annals of Geophysics, 2008
This paper focuses on the problem of invalid O/X polarization tagging of an ionogram and how this can affect ionogram autoscaling methods. To illustrate this problem, 623 ionograms recorded in March and April 2004 (days 080-105) by the digisonde 256
C. Scotto, M. Pezzopane
doaj   +1 more source

Ionogram inversion F1-layer treatment effect in raytracing

Annals of Geophysics, 2005
This paper shows the importance of the F1-layer shape in the electron density profiles obtained from ionograms with different inversion techniques when the profiles are used in ray tracing.
S. M. Radicella, M. L. Zhang, G. Miró Amarante   +2 more
doaj   +1 more source

Variations in the ionosphere during an aurora substorm as observed by an ionosonde

Antarctic Record, 2008
In order to obtain a better understanding of the influence of precipitating electrons on the ionosphere, we tried to estimate their effect from ionosonde observation data (ionograms) during an aurora substorm.
Joji Watanabe, Mamoru Ishii, Yoshihisa Matsuda   +2 more
doaj   +1 more source

Deep Neural Network-Based Inversion Method for Electron Density Profiles in Ionograms

Atmosphere
Accurate inversion of ionograms of the ionosonde is of great significance for studying ionospheric structure and radio wave propagation. Traditional inversion methods usually describe the electron density profile based on preset polynomial functions, but
Longlong Niu, Chen Zhou, Na Wei, Guosheng Han, ZhongXin Deng, Wen Liu   +5 more
doaj   +1 more source

A Frequency Selecting Method for High-Frequency Communication Based on Ionospheric Oblique Backscatter Sounding

Remote Sensing
Ionospheric oblique backscatter sounding is an effective means of monitoring the ionosphere which can be used as a frequency selection system to serve HF communication and ensure its quality and stability. But how to obtain effective information from the
Chuqi Cai, Guobin Yang, Tongxin Liu, Chunhua Jiang   +3 more
doaj   +1 more source

Satellite Traces: Ionogram Signatures of Bottom‐Side Upwelling Structures ‐ A Simulation Study

Geophysical Research Letters
Satellite 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, S. Tulasi Ram, T. Yokoyama, R. T. Tsunoda, A. P. Dimri, S. Mondal, Chinmaya Nayak   +6 more
doaj   +1 more source

The extreme depletion of ionospheric electron density and its hemispheric asymmetry during the May 2024 storm. [PDF]

Natl Sci Rev
Chen Y, Aa E, Yuan T, Zhang S, Shen H, Yue X, Xu H, Liu S, Wang X, Huang W, Li H, Luo B, Zhang Q, Wang C.   +13 more
europepmc   +1 more source

Three Candidates, Two Peaks: Addressing Conflicting Assignments of Fentanyl Protomers with DMS-UVPD. [PDF]

J Am Soc Mass Spectrom
Ieritano C, Fry AN, Dodds JN, Baker ES, Hopkins WS.   +4 more
europepmc   +1 more source

First Cases of Dengue Fever Confirmed in the National Hospitals of Zinder and Niamey. [PDF]

Case Rep Infect Dis
Mahamadou D, Lagare A, Sahada M, Abdoul-Aziz AB, Lamine MM, Fils SA, Hamsatou B, Hama HI, Thomas G, Lazoumar RH, Aziz GA, Eric A.   +11 more
europepmc   +1 more source