Results 81 to 90 of about 723 (151)

The intermediate layers and associated tidal motions observed by a digisonde in the equatorial anomaly region [PDF]

, 2003
. This investigation presents an initial attempt to analyze a full year of daily ionosonde observations relevant to the determination of plasma densities, tidal structures, and ion transports in the equatorial anomaly region of the lower ionosphere ...
C.-J. Pan, H.-H. Hsu, J.-Y. Liu, C.-C. Lee   +3 more
core   +1 more source

Vertical electron density profiles from digisonde ionograms. The average representative profile

Annals of Geophysics, 1996
Profile calculations from ionograms using the Huang-Reinisch technique arrive at a set of boundary values and coefficients that describe the profile.
B. W. Reinisch, X. Huang
doaj   +1 more source

VARIABILITY OF IONOSPHERIC F2 REGION DUE TO SUDDEN STRATOSPHERIC WARMING EVENT OF 2017 [PDF]

Proceedings on Engineering Sciences
We analyzed the impact of minor Arctic sudden stratospheric warming (SSW) event of 2017 on the ionospheric F2 region, using Digisonde data from a low-mid latitude Indian station, Delhi (28.6°N, 77.2°E, 19.2°N geomagnetic latitude, 42.4°N dip).
Qadeer Ahmed, Anshul Singh , N. Praneetha , Ankit Gupta , Arti Bhardwaj , Puja Goel , Arun Kumar Upadhayaya   +6 more
doaj   +1 more source

The occurrence variability of severe scintillation and Range Spread F from the varying nature of Large-to-Meso-Scale-Wave-Structures: Observations and simulation

.ismr file have GNSS data such as SVID,TIME,LAT,LON,AZIMUTH,ELEVATION,S4,TEC .zip files have digisonde data such as TIME, FREQUENCY, REAL ...
Kherani, Esfhan Alam
core   +1 more source

A Method to Retrieve Aeronomic Parameters From Noontime Bottom‐Side Equatorial Ne(h) and Satellite Neutral Density Observations

Space Weather
A new method has been proposed to retrieve neutral composition ([O] [O2], [N2]), exospheric temperature (Tex), vertical ExB plasma drift, and total solar EUV flux (λ ≤ 1050Å) using Digisonde DPS‐4 daytime bottom‐side (≥200 km) Ne(h) profiles and ...
L. Perrone, A. V. Mikhailov
doaj   +1 more source

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

Atmosphere
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 ...
Krishnendu Sekhar Paul, Mehdi Hasan Rafi, Haris Haralambous, Mohammad Golam Mostafa   +3 more
doaj   +1 more source

DINData: A Windows Software to Reformat and Clean Digisonde Numeric Dataset

BIMA JOURNAL OF SCIENCE AND TECHNOLOGY GOMBE
The ionospheric numerical ionogram dataset in the Digisonde Ionogram Database (DIDBase), hosted by the Global Ionospheric Radio Observatory (GIRO), provides an important opportunity to study the bottomside ionospheric electron density profile. However, this dataset often contains inconsistencies, including missing observation periods, irregular time ...
Bello, S.A., Yusuf, K.A., Sharafa, S.B., Shehu, S.J., Joseph, O.A., Oluwafemi, L.D.   +5 more
openaire   +2 more sources

Differences between GPS and digisonde measurements of Total Electron Content at Tucumán

, 2010
Measurements of Total Electron Content (TEC) were obtained from GPS and digisonde data, at Tucumán (26.69°S, 65.23°W), for days in different seasons, and with different geomagnetic activities, in 2004.
V. Rios, Medina, C., B. Haro Barbás, Rios, V., Haro Barbás, B., C. Medina   +5 more
core   +1 more source

D- and F-Region Ionospheric Response to the Severe Geomagnetic Storm of April 2023

Atmosphere
This 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, Sujay Pal, Bakul Das, Sushanta K. Mondal   +3 more
doaj   +1 more source

Apparent vertical ionospheric drift: a comparative assessment of digisonde and ionogram-based methods

Atmospheric Measurement Techniques
Reliable estimation of vertical plasma drift in the ionosphere is crucial for interpreting ionospheric dynamics and enhancing the accuracy of space weather models. This study provides a comparative assessment of direct Digisonde Drift Measurements (DDM) and indirect ionogram-based methods using parameters such as hmF2,
Kouba, D. (Daniel), Mošna, Z. (Zbyšek), Koucká Knížová, P. (Petra)   +2 more
openaire   +4 more sources