ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    A Single-Station Spectral Model of the Monthly Median foF2 and M(3000)F2 (1998)
    Springer
    Studia geophysica et geodaetica 42 (1998), S. 183-196 
    Details
    ISSN: 1573-1626
    Keywords: F-region ; Fourier decomposition ; solar-cycle variation ; monthly median model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract A new single-station model (SSM) for monthly median values of the ionospheric parameters foF2 and M(3000)F2 has been developed. Fourier analysis provides a tool for decomposing the time-varying ionospheric parameters. The 12–month smoothed sunspot number R 12 was used as an external solar characteristic because of its availability and predictability. However, for the first time, the solar activity is described not only by R 12 , but also by the linear coefficient K R representing the tendency of the change of solar activity. A general non-linear approximation of the influence of the solar-cycle characteristics R 12 and K R and ionospheric parameters foF2 and M(3000)F2 was accepted. The new SSM is applied to several European stations and its statistical evaluation shows better results than the other two SSMs used in the paper. The approach described in the paper does not contradict the use of different synthetic ionospheric indices (as the T-index, MF2–index); the basic aim is to show only that using one additional new characteristic of the solar-cycle variations, such as K R , improves the monthly median model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023361105552
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Observed Response of the Ionospheric F2–Layer and Lower Thermosphere to Geomagnetic Storms during High Solar Activity (1998)
    Springer
    Studia geophysica et geodaetica 42 (1998), S. 119-136 
    Details
    ISSN: 1573-1626
    Keywords: geomagnetic storm ; Fourier formalism ; ionosphere F2–layer ; meteor wind ; diurnal and semidiurnal tides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences , Physics
    Notes: Abstract The response of the critical frequency of the ionosphere F2–layer, described by its main Fourier components (daily constant, “diurnal” and “semidiurnal waves”) and the lower thermosphere dynamics to the geomagnetic storms in July 1991 and February 1992 is studied. The daily constant displays a negative response, however, the magnitude of reaction depends on the season and latitude. The amplitudes of “diurnal” and “semidiurnal waves” increase during a geomagnetic storm, as this enhancement is very strong at high latitudes in winter. The prevailing neutral wind, especially the zonal wind, shows an inclination to decrease during the geomagnetic storm (the effect is more distinct in summer). The amplitudes of diurnal and semidiurnal tides also demonstrate a tendency toward reduction during high geomagnetic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023300919664
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...