amp Ionosphere Dr Tiju Joseph Mathew Asst Professor Dept of Physics Christian College Chengannur The Earths Atmosphere amp Ionosphere The Ionosphere The ionized part of Earths upper atmosphere ID: 816389
Download The PPT/PDF document "The Earth’s Atmosphere" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
The Earth’s Atmosphere&Ionosphere
Dr.
Tiju
Joseph Mathew
Asst. Professor, Dept. of Physics,
Christian College, Chengannur
Slide2The Earth’s Atmosphere&IonosphereThe Ionosphere The ionized part of Earth's upper atmosphere. Ionized by solar radiation.
Slide3Ni = Ne = NPhotoionization + RecombinationF – Peak at 300km Electron Density Profile
Slide4D region Region below 90 kms Electrons and ions are controlled by magnetic field. E region Region between 90 – 150 kms Ion movement is controlled by neutral wind & Electron movement by geomagnetic field.F region Region having highest concentration of free electrons and ions. Ion movement and Electron movement is controlled by geomagnetic field.
Layers of Ionosphere
Slide5Sensitive Monitor of Atmospheric Events. Sensitive Monitor of Solar Phenomena. Wave guide for Radio wave PropagationImportance of Ionospheric Studies
Slide6Ground based Navigation SystemSpace based GPS systemIonospheric Effect on Navigation System
Slide7Radio Wave Refraction in Ionosphere
Slide8Critical Frequency (foF2)Peak Height (hmF2)Radio Wave Refraction in Ionosphere
Slide9The refractive index ,A transmitted wave reflects when theFrequency of transmitted wave = Plasma frequencyPlasma Frequency,Parameters affecting the Refractive Index Frequency of Transmitting Wave Number Density of ElectronsVertical Ionospheric Sounding
Slide10Variations In IonosphereRegular Variations - Occurs in CycleDiurnalSeasonalSolar CycleIrregular Variations - Occurs AbnormallySudden Ionospheric DisturbancesIonospheric Storms
Slide11Diurnal Variation Result of Earth’s RotationDaytimePhotoionization BeginsF separated F1+F2Night timePhotoionization StopsRecombination BeginsD VanishesF1 & F2 merges together
Slide12Thank You