Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/1293
DC Field | Value | Language |
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dc.contributor.authorall | Belehaki, A.; National Observatory of Athens, Institute for Space Applications and Remote Sensing, Palea Penteli, Greece | en |
dc.contributor.authorall | Moraitis, G.; National Observatory of Athens, Institute for Space Applications and Remote Sensing, Palea Penteli, Greece | en |
dc.contributor.authorall | Tsagouri, I.; University of Athens, Physics Department, Nuclear and Particle Physics Section, Athens, Greece | en |
dc.date.accessioned | 2006-07-05T08:15:59Z | en |
dc.date.available | 2006-07-05T08:15:59Z | en |
dc.date.issued | 2000-01 | en |
dc.identifier.uri | http://hdl.handle.net/2122/1293 | en |
dc.description.abstract | In this paper an hourly local ionospheric index f n F 2 is proposed to define the normal level of the undisturbed ionosphere. For the determination of this index a model is developed where the normal values of the f 0 F 2 parameter were reproduced using multiple regression analysis. For each month of the year, for a given station, a set of 48 or 72 coefficients are calculated, depending on the monthly sunspot activity. Then, the normal values of the f 0 F 2 parameter are computed as a function of the daily sunspot number. The analysis of the model results revealed the following characteristics for the f n F 2 index: first, the temporal variations that characterize the normal ionosphere, imposing some artificial effects on the monthly median values, are eliminated from the newly derived f n F 2 index. Second, the f n F 2 index does not follow the false steplike variations observed in the monthly median f 0 F 2 time series, in transition periods from one month to another. Third, during intervals of low magnetospheric activity,the f n F 2 index presents a very good degree of fit with the observed f 0 F 2 parameter, compared to the monthly median f 0 F 2 behaviour. During disturbed conditions, the f n F 2 index remains at the normal level, whereas median values are affected by ionospheric disturbances. In general, the data analysis showed that the f n F 2 index varies only with the daily sunspot number Rz and is independent of the magnetospheric activity, approaching the level of the normal ionosphere with a high degree of confidence. | en |
dc.format.extent | 6550475 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.relation.ispartofseries | 1/43 (2000) | en |
dc.subject | reference ionosphere | en |
dc.subject | ionospheric disturbance | en |
dc.subject | ionospheric indices | en |
dc.title | On the derivation of an hourly local index to define the normal ionosphere | en |
dc.type | article | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.subject.INGV | 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | open | en |
dc.contributor.author | Belehaki, A. | en |
dc.contributor.author | Moraitis, G. | en |
dc.contributor.author | Tsagouri, I. | en |
dc.contributor.department | National Observatory of Athens, Institute for Space Applications and Remote Sensing, Palea Penteli, Greece | en |
dc.contributor.department | National Observatory of Athens, Institute for Space Applications and Remote Sensing, Palea Penteli, Greece | en |
dc.contributor.department | University of Athens, Physics Department, Nuclear and Particle Physics Section, Athens, Greece | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Institute for Space Applications and Remote Sensing, National Observatory of Athens, Palaia Penteli, Greece" | - |
crisitem.author.dept | National Observatory of Athens, Institute for Space Applications and Remote Sensing, Palea Penteli, Greece | - |
crisitem.author.dept | National Observatory of Athens, Institute for Space Applications and Remote Sensing, Palaia Penteli 15236, Greece | - |
crisitem.author.orcid | 0000-0002-9270-5387 | - |
crisitem.classification.parent | 01. Atmosphere | - |
Appears in Collections: | Annals of Geophysics |
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