The IMF sector structure effects in total ozone in central Europe

1989 ◽  
Vol 33 (2) ◽  
pp. 198-205 ◽  
Author(s):  
Jürgen Bremer ◽  
Jan Laštovička ◽  
L. Křivský
Keyword(s):  
Central Europe ◽  
Total Ozone ◽  
Sector Structure ◽  
The Imf

scholarly journals Comment on “Identification of the IMF sector structure in near-real time by ground magnetic data” by Janzhura and Troshichev (2011)

2021 ◽  
Vol 39 (2) ◽  
pp. 369-377
Author(s):  
Peter Stauning
Keyword(s):  
Solar Wind ◽  
Real Time ◽  
International Association ◽  
Magnetic Data ◽  
Reference Level ◽  
Sector Structure ◽  
Polar Cap ◽  
Ground Magnetic ◽  
The Imf

Abstract. The only published description of the solar wind sector (SS) term used for the reference level in the post-event and real-time derivation of the Polar Cap (PC) indices, PCN (Polar Cap North) and PCS (Polar Cap South), in the version endorsed by the International Association for Geomagnetism and Aeronomy (IAGA) is found in the commented publication, Janzhura and Troshichev: Identification of the IMF sector structure in near-real time by ground magnetic data, Annales Geophysicae, 29, 1491–1500, 2011. Actually, the publication has served as a basis for the index endorsement by IAGA in 2013. However, neither the illustrations nor the results presented there have been derived by the specified near real-time method. Figures 1, 6, 7, and 8 display values derived by post-event calculations based on daily medians smoothed over 7 d centred on the day of interest. Figures 2, 3, and 4 display observed values smoothed over 7 d, while the remaining Fig. 5 displays averages over 4 months. In summary, there are strong disagreements between indications in the title, abstract, and statements in the text compared to the actual results and their illustrations.

Specific variability of total ozone over Central Europe during spring and summer in the period 1979-2014

2015 ◽  
Vol 36 (10) ◽  
pp. 3539-3549 ◽  
Author(s):  
Janusz W. Krzyścin ◽  
Bonawentura Rajewska-Więch
Keyword(s):  
Central Europe ◽  
Total Ozone

scholarly journals Interplanetary magnetic field and its possible effects on the mid-latitude ionosphere II

1994 ◽  
Vol 37 (2) ◽  
Author(s):  
Y. Tulunay
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Interplanetary Magnetic Field ◽  
Sector Structure ◽  
Quiet Time ◽  
Time Value ◽  
The Mean ◽  
The Imf

Using criticaI frequencies, f0F2 from the Uppsala, Lannion and Dourbes ionosonde stations, the possible effects of the orientation of the IMF on mid-latitude ionosphere are further investigated. For this purpose, the regular diurnal, seasonal and solar cycle variations in the f0F2 data were removed by subtracting the mean of f0F2 for the same UT on all the magnetically quiet days (Ap< 6) within 15 days around the IMF Bz turnings. This yields the deviation from the average quiet-time value ?f0F2. The data are sorted according to the polarity of the IMF Bz and the effects of the southward turnings are discussed. Hapgood et al. (1991), Tulunay et al. (1991), Tulunay and Rahman (1992) investigated the possible effects of the IMF on mid-latitude ionosphere by employing the Slough and Argentine Islands f0F2 data. In order to facilitate a comparison the same method of analysis is being adopted again. However, in the present work the southward polarity changes in IMF Bz with no consideration of the IMF sector structure were considered only.

Effects of the imf sector structure in the midlatitude troposphere and stratosphere

1986 ◽  
Vol 30 (4) ◽  
pp. 394-403 ◽  
Author(s):  
Jan Laštovička ◽  
F. Pechala
Keyword(s):  
Sector Structure ◽  
The Imf

scholarly journals Long-term variations of the UV-B radiation over Central Europe as derived from the reconstructed UV time series

2004 ◽  
Vol 22 (5) ◽  
pp. 1473-1485 ◽  
Author(s):  
J. W. Krzyscin ◽  
K. Eerme ◽  
M. Janouch
Keyword(s):  
Central Europe ◽  
Uv Radiation ◽  
Total Ozone ◽  
Multivariate Adaptive Regression Splines ◽  
Transfer Model ◽  
Model Calculations ◽  
Radiative Processes ◽  
Long Term Changes ◽  
Long Term Variations

Abstract. The daily doses of the erythemally weighted UV radiation are reconstructed for three sites in Central Europe: Belsk-Poland (1966–2001), Hradec Kralove-Czech Republic (1964–2001), and Tõravere-Estonia (1967–2001) to discuss the UV climatology and the long-term changes of the UV-B radiation since the mid 1960s. Various reconstruction models are examined: a purely statistical model based on the Multivariate Adaptive Regression Splines (MARS) methodology, and a hybrid model combining radiative transfer model calculations with empirical estimates of the cloud effects on the UV radiation. Modeled long-term variations of the surface UV doses appear to be in a reasonable agreement with the observed ones. A simple quality control procedure is proposed to check the homogeneity of the biometer and pyranometer data. The models are verified using the results of UV observations carried out at Belsk since 1976. MARS provides the best estimates of the UV doses, giving a mean difference between the modeled and observed monthly means equal to 0.6±2.5%. The basic findings are: similar climatological forcing by clouds for all considered stations (~30% reduction in the surface UV), long-term variations in UV monthly doses having the same temporal pattern for all stations with extreme low monthly values (~5% below overall mean level) at the end of the 1970s and extreme high monthly values (~5% above overall mean level) in the mid 1990s, regional peculiarities in the cloud long-term forcing sometimes leading to extended periods with elevated UV doses, recent stabilization of the ozone induced UV long-term changes being a response to a trendless tendency of total ozone since the mid 1990s. In the case of the slowdown of the total ozone trend over Northern Hemisphere mid-latitudes it seems that clouds will appear as the most important modulator of the UV radiation both in long- and short-time scales over next decades. Key words. Atmospheric composition and structure (biospheric-atmosphere interaction) – Meteorology and atmospheric dynamics (climatology; radiative processes)

scholarly journals Comments on quiet daily variation derivation in "Identification of the IMF sector structure in near-real time by ground magnetic data" by Janzhura and Troshichev (2011)

2013 ◽  
Vol 31 (7) ◽  
pp. 1221-1225 ◽  
Author(s):  
P. Stauning
Keyword(s):  
Solar Wind ◽  
Real Time ◽  
Daily Variation ◽  
Magnetic Data ◽  
Sector Structure ◽  
Polar Cap ◽  
Ground Magnetic ◽  
The Imf

Abstract. The description presented in the paper of the relations of the solar wind sector structure to the derivation of the quiet daily variation (QDC) in polar magnetic recordings used for calculation of polar cap (PC) indices is found to be unclear and not properly justified. The presented example on inclusion of a solar sector term in an actual QDC series is found to be questionable even on the authors' premises.

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