It extends from 50 km to more than 1000 km altitude.
#Nasa omniweb free#
The ionosphere is a layer of the Earth’s upper atmosphere comprising high concentration of electrons and ions, mostly caused by the solar radiation producing free electrons from the existing atmospheric gases. It is due to the varia- tions in heights as well as the peak electron densities of theĪdditional information is available at the end of the chapter It is also observed that the bottom side region of the IRI model derived profile compares well with that of the reconstructed profile in some cases and is differing in the rest of the cases. Similarly, the vertical elec- tron density profiles derived for all the 24 h of the local time at Waltair are presented in Fig. It is observed from these plots that during 09:00 to 14:00 LT, the bottom side regions of IRI and reconstructed profiles are at the similar height range and later the reconstructed profile started drifting upward which may be due to the E ×B drifts, while the IRI model derived profile is not showing this verti- cal movement and thus it differed with reconstructed profile much more in the later hours. In most of the cases the IRI model is underestimating the NmF2 val- ues compared to those of the ionosonde derived values. No considerable similarity is observed between the reconstructed and the IRI model de- rived topside profiles during most of the local times. It is seen from this figure that only for a very few hours (during 09:00 to 15:00 LT), the IRI model derived bottom side profile is comparable to that obtained from the ionosonde, however, the correspond- ing topside profiles are showing significant deviations from those of the reconstructed ones. Profiles for all the 24 h of local time over Trivandrum are derived and presented in Fig. IRI model derived profiles (red lines) are also plotted for comparison. Typical examples of vertical electron density profiles reconstructed over a low latitude station Waltair during four different time intervals.
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