Results 81 to 90 of about 703 (173)

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

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

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

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

Investigation of the possible relationship between the occurrences of atmospheric gravity waves and equatorial Spread-F. [PDF]

Heliyon, 2023
Olawepo AO, Olagunju OE, Ajani OV.
europepmc   +1 more source

Exploring the occurrence rate of mesosphere summer like echoes with Digisonde at Tromsø

, 2020
The radar echoes from the polar summer mesopause are observed simultaneously with Digisonde, Dynasonde, and European Incoherent Scatter Scientific Association (EISCAT) very-high-frequency (VHF) radar. The irregular characteristics of sporadic E (Es) layers at altitude range of about 80–90 km observed by Digisonde at Tromsø during 2003 to 2014 are ...
Hailong Li, Abdur Rauf, Maoyan Wang, Ge Shucan, Safi Ullah   +4 more
openaire   +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

Night-Time Ionospheric Localized Enhancements (NILE) Observed in North America Following Geomagnetic Disturbances. [PDF]

J Geophys Res Space Phys, 2021
Chartier AT, Datta-Barua S, McDonald SE, Bust GS, Tate J, Goncharenko LP, Romeo G, Schaefer RK.   +7 more
europepmc   +1 more source

Behavior of the scale height at the F2 layer peak derived from Digisonde measurements at two European stations

, 2007
A new technique is presented to estimate the electron density topside profile from information derived from ground-based ionograms. The electron density above the F2 peak is approximated by an a-Chapman function with constant scale height (Hm).
Altadill, D, Mosert, M., Morena, B. de la, Miró Amarante, Gloria, Mansilla, G., Ezquer, R.   +5 more
core   +1 more source

Digital radio and its application in the HF (2-30 MHz) band [PDF]

, 2004
The propagation environment at high frequencies (HF, 2-30 MHz) has a significant impact on the performance of radio systems (especially data communications).
Davies, Nigel Clement
core   +1 more source