Enhancing the ISIS‐I Topside Digital Ionogram Database

0496768 - ÚFA 2019 RIV US eng J - Článek v odborném periodiku
Benson, R. F. - Bilitza, D. - Fung, S. F. - Truhlík, Vladimír - Wang, Y.
Enhancing the ISIS‐I Topside Digital Ionogram Database.
Radio Science. Roč. 53, č. 12 (2018), s. 1492-1505. ISSN 0048-6604. E-ISSN 1944-799X
Grant CEP: GA MŠMT(CZ) LTAUSA17100
Institucionální podpora: RVO:68378289
Klíčová slova: data enhancement * data/model comparisons * digital topside ionograms * ionospheric topside vertical electron-density profiles * ISIS * topside ionosphere
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 1.658, rok: 2018
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018RS006659

Selected original analog telemetry tapes from three of the topside-sounder satellites of the International Satellites for Ionospheric Studies (ISIS) program, namely Alouette 2, ISIS I, and ISIS II, were used in an earlier project to produce more than 1/2 million digital topside ionograms: the resulting digital topside ionograms from ISIS II were used to produce more than 86,000 globally distributed vertical topside ionospheric electron density profiles N-e(h) that cover a time span of more than a solar cycle. These N-e(h) were produced using the Topside Ionogram Scaler with True height algorithm auto-scaling software. Before attempting to automatically process Alouette-2 or ISIS-I ionograms, a data-enhancement project was initiated so as to increase the number of ionograms suitable for manual scaling and to increase the auto-processing success rate. These enhancements were mainly to correct problems that often occurred during the analog-to-digital conversion of the original telemetry tapes. Here we illustrate the improvements made to the ISIS-I digital topside ionograms and compare N-e values at the satellite altitude and N-e(h) profiles, based on the manual scaling of selected ionograms, to both the auto-scaled values and the predictions of the International Reference Ionosphere 2016 model. The results indicate the need to improve the available auto-processing software for the new ISIS-I digital ionograms and that International Reference Ionosphere 2016 predicts midlatitude winter topside N-e values that are too high in the late morning and at noon but too low in the early morning.

Trvalý link: http://hdl.handle.net/11104/0289414