[PDF] Top 20 Variations in the occurrence of SuperDARN F region echoes
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Variations in the occurrence of SuperDARN F region echoes
... The occurrence of F region ionospheric echoes ob- served by a number of SuperDARN HF radars is analyzed statistically in order to infer solar cycle, seasonal, and diur- nal ...echo ... See full document
10
Occurrence of Similar Periods in Geomagnetic Field Variations and Solar Activity
... of occurrence of a phenomenon is an essential concept in the scientific world, hence, scientists and meteorologists observe phenomena in terms of time series, as this gives a clearer description and understanding ... See full document
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On the seasonal variations of the threshold height for the occurrence of equatorial spread F during solar minimum and maximum years
... In the whole study, one of the important factors with re- gard to the RT instability, namely the seed perturbations, has been assumed to be omnipresent, which need not necessar- ily be true. It is generally believed that ... See full document
7
Seasonal variations in the occurrence of acute appendicitis and their relationship with the presence of fecaliths in children
... Conclusions This study shows the differences in the clinical informa- tion between the summer and non-summer groups of AA patients. The increase in the number of AA patients in the summer may be due to the ... See full document
5
Occurrence of F region echoes for the polar cap SuperDARN radars
... echo occurrence minor dips at winter solstices are related to significant decrease of the F region electron density, especially at ...Diurnal variations of the echo occurrence rate were ... See full document
17
Effects on SuperDARN HF radar echoes of sudden impulses of solar wind dynamic pressure
... 4.1 AE index analysis Visual inspection of plots of solar wind parameters and MRS for all the events suggested to us that some MRS variations might not be directly triggered by the SI. The natural inter- pretation ... See full document
13
Occurrence of polar mesosphere summer echoes at very high latitudes
... potential variations more clearly, the seasonal development of the occurrence rates OR(SNR>SNR min with SNR min =0 dB as defined above) in the individual year 2001 is displayed in ...the occurrence ... See full document
12
Magnetic local time, substorm, and particle precipitation-related variations in the behaviour of SuperDARN Doppler spectral widths
... the F-region ...the occurrence of genuine multiple SWBs, possibly caused by spatial variations in three or more prevalent lev- els of ionospheric conductance, and thus spectral width dis- ... See full document
20
Occurrence frequencies of polar mesosphere summer echoes observed at 69 N during a full solar cycle
... Figure 1 shows the annual distribution of PMSE vol- ume reflectivity observed with ALWIN, ALWIN64 and MAARSY on Andøya between 1999 and 2012. The left bor- ders of the distributions illustrate the differences in ... See full document
6
Observational evidence for the plausible linkage of Equatorial Electrojet (EEJ) electric field variations with the post sunset F-region electrodynamics
... ESF occurrence probability is also more than 90%. The time of occurrence of maximum V z is observed to be centered around 19:00 IST or earlier during almost all the months of ...larger occurrence ... See full document
10
Occurrence and Causes of F-region Echoes for the Canadian PolarDARN/SuperDARN Radars
... noon echoes, contrary to the midnight ...echo occurrence implies that besides refraction and reflection from the ground, additional factors control polar cap echo detection with the auroral zone radars; the ... See full document
108
On the factors controlling occurrence of F-region coherent echoes
... of F-region ...the F-region echo appearance at a specific spot in the high latitude ...of echoes were ob- served. We found that D-region absorption is a minor factor for the echo ... See full document
13
F-region ionosphere effects on the mapping accuracy of SuperDARN HF radar echoes
... cusp region, the peaks of SWB-AEB offset versus MLT tends to be located near ...enhanced F region density in the noon and postnoon sectors, while due to raypath geome- try the different horizontal ... See full document
17
Heights of SuperDARN F region echoes estimated from the analysis of HF radio wave propagation
... Hankasalmi echoes received at ranges of 400–900 km are quite often coming from the E region, sometimes from the F region and sometimes from both the E and F regions (Milan and Lester, ... See full document
8
A Statistical study of the Doppler spectral width of high-latitude ionospheric F-region echoes recorded with SuperDARN coherent HF radars
... ionospheric F-region ...a region of very high spectral width, col- located with the ionospheric LLBL/cusp/mantle region; an oval shaped region of high spectral width, whose equator- ... See full document
13
An adjusted location model for SuperDARN backscatter echoes
... for SuperDARN backscatter echoes 4 Summary In this study, an attempt is made to statistically estimate the expected locations of ionospheric echoes that SuperDARN radar can observe by ... See full document
11
A possible origin for large aspect angle “HAIR” echoes seen by SuperDARN radars in the E region
... E region decameter size echoes that seem to be relatively weak, have apparently unusually large aspect an- gles, and possess Doppler shifts that are slow and are clearly consistent with the ion drift of the ... See full document
6
Spectral width of SuperDARN echoes: measurement, use and physical interpretation
... latitude region where different boundaries of the magnetosphere map to the ...from SuperDARN data, has been used to identify the iono- sphere footprints of various magnetosphere ... See full document
14
Assessing the contamination of SuperDARN global convection maps by non-F-region backscatter
... beams. 2.2 Example meridional beam Goose Bay beam 4 points poleward and represents a good ex- ample of a meridional beam (shown as a shaded green beam in Fig. 2). Figure 4a presents the velocity distribution for this ... See full document
16
Signatures of moving polar cap arcs in the F-region PolarDARN echoes
... The onset of the polar cap arcs is often related to variations in the IMF B z and B y (e.g. Hosokawa et al., 2011). We were unable to find an obvious trigger of the arcs in variations of the IMF B y and B z ... See full document
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