Results 101 to 110 of about 5,624 (239)

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

Nighttime ion composition measurements at the geomagnetic equator [PDF]

Two ion composition profiles, representative of the nighttime equatorial ionosphere between 90 km and 300 km, are presented. These profiles were obtained by two rocket-borne ion mass spectrometers on a single night for solar zenith angles of 112 deg and ...
Aikin, A. C., Goldberg, R. A.
core   +1 more source

Study of the dynamics and ionization of the upper atmosphere Final report [PDF]

Wind effects on nighttime E region ionization layer ...
Bedinger, J., Constantinides, E., Smith, L. G.   +2 more
core   +1 more source

VARIASI KETINGGIAN LAPISAN F IONOSFER PADA SAAT KEJADIAN SPREAD F [PDF]

, 2009
Ionosfer, yang merupakan daerah atmosfer terionisasi, dapat dibagi menjadi 4 daerah yaitu daerah D, E, F1 dan F2. Daerah D terletak pada ketinggian sekitar 50 – 90 km, daerah E antara 90 – 140 km, daerah F1 antara 140 – 210 km dan daerah F2 diatas 210 km.
Buldan, Muslim, Mumen, Tarigan
core  

Recombination in the Nighttime F-region from Incoherent Scatter Measurements [PDF]

Recombination coefficients in F layer measured by ion density profiles derived from reduced ...
Mc Crory, D. R., Nisbet, J. S.
core   +1 more source

Ionospheric effects of the extreme solar activity of February 1986 [PDF]

During February 1986, near the minimum of the 11 year Solar sunspot cycle, after a long period of totally quiet solar activity (R sub z = 0 on most days in January) a period of a suddenly enhanced solar activity occurred in the minimum between solar ...
Boska, J., Pancheva, D.
core   +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

F-region nightglow emissions of atomic oxygen. II - Analysis of 6300 angstrom and electron density data [PDF]

F-region nightglow emissions of atomic oxygen - analysis of 6300 angstrom and electron density ...
Peterson, V. L., Steiger, W. R.
core   +1 more source

Modeling ionograms and critical plasma frequencies with neural networks

Frontiers in Astronomy and Space Sciences
Ionosondes offer broad spatial coverage of the lower ionosphere, supported by a global network of affordable instruments. This motivates the exploration of new methods that exploit this geographical coverage to capture spatially dependent characteristics
Enrique L. Rojas, Jhassmin A. Aricoche, Marco A. Milla   +2 more
doaj   +1 more source