Ning, "A study of the ionogram derived effective scale height around the ionospheric hmF2," Annales Geophysicae, vol.
Titheridge, "Ionogram analysis with the generalized program POLAN," Report UAG-93, World Data Center A for SolarTerrestrial Physics, 1985.
We also collected additional variables: admission "at night" (between 19:00 and 07:00); admission on weekend (from 19:00 on Friday to 07:00 on Monday); presence of a systemic inflammatory response syndrome (SIRS)  during the ED stay; anion gap (calculated as [[Na.sup.+] + [K.sup.+]] - [[Cl.sup.-] + alkaline reserve]) when blood ionogram
Over the years, several models have been developed in order to extract information about the ionosphere from ionograms
. Specifically, long term (SWILM , SIRM , PASHA  and IRI model ), short term (IFELMOR model ) and real time (SIRMUP , ISWILM ) models have been proposed.
: sodium: 137 mmol/l (N: 135-145 mmol/l), chloride: 112 mmol/l (N: 95-108 mmol/ l), potassium: 4.2 mmol/l (N: 3.6-5.5 mmol/l).
Esta herramienta permite verificar el escalado automatico (Automatic Real Time Ionogram Scaler with True Height, ARTIST, Reinisch and Huang, 1983) y corregir manualmente los posibles errores de interpretacion.
Recientemente, el UMLCAR ha desarrollado la base de datos Digital Ionogram DataBase DIDBase (Reinisch, et al., 2004; http://umlcar.uml.edu/DIDBase/) que agrupa un gran numero de archivos de sondeos ionosfericos.
2000 'Disciplining technology: electronic reliability, cold-war military culture and the topside ionogram
' History and Technology 17(2), 125-175
: Sodium level in the studied frogs (118.6[+ or -]11.2 meq/L) was similar to the levels reported on R.
In order to validate the sources of these ionospheric echoes, concurrent ionogram
observed by the Chung-Li ionosonde that is an instrument vertically transmitting a FM pulse with a frequency range of 0.5-30 MHz to exclusively detect the echoes from ionospheric layers and electron density irregularities is adopted for comparison.
Pietrella et al., "Testing the IONORT-ISP system: a comparison between synthesized and measured oblique ionograms
," Radio Science, vol.
Recent advances in real-time analysis of ionograms
and ionospheric drift measurements with digisondes.