English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

There are differences between existing modelsof solar EUV with &#x03BB; &#x003C; 1050 Å and between laboratory measurementsof the O+ + N2 – reaction rate coefficient, bothparameters being crucial for the F2-region modeling. Therefore, indirectaeronomic estimates of these parameters may be useful for qualifying theexisting EUV models and the laboratory measured O+ + N2 –rate coefficient. A modified self-consistent method for daytime F2-regionmodeling developed by Mikhailov and Schlegel was applied to EISCAT observations(32 quiet summer and equinoctial days) to estimate the set of main aeronomicparameters. Three laboratory measured temperature dependencies for the O++ N2 – rate coefficient were used in our calculations to findself-consistent factors both for this rate coefficient and for the solar EUVflux model from Nusinov. Independent of the rate coefficient used, thecalculated values group around the temperature dependence recently measured byHierl et al. in the 850–1400 K temperature range. Therefore, this ratecoefficient may be considered as the most preferable and is recommended foraeronomic calculations. The calculated EUV flux shows a somewhat steeperdependence on solar activity than both, the Nusinov and the EUVAC modelspredict. In practice both EUV models may be recommended for the F2-regionelectron density calculations with the total EUV flux shifted by ±25% for theEUVAC and Nusinov models, correspondingly. Key words: Ionosphere (ion chemistry and composition;ionosphere atmosphere interactions; modeling and forecasting)</p

annales geophysicae

A self-consistent estimate of O&amp;lt;sup&amp;gt;+&amp;lt;/sup&amp;gt; + N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; − rate coefficient and total EUV solar flux with λ &amp;lt; 1050 Å using EISCAT observations