Variation of the 0+ ion density during low and high solar activity as measured by the SR0SS-C2 satellite |
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| Institution: | Department of Physics, FET, Manav Rachna International University, and Department of Physics, Manav Rachna College of Engineering, Faridabad-121001, India;Department of Physics, Manav Rachna College of Engineering, Faridabad-121001, India;Department of Physics, Manav Rachna College of Engineering, Faridabad-121001, India;Department of Physics, FET, Manav Rachna International University, Faridabad-121001, India;Department of Physics, Indian Institute of Technology, Roorkee-247667, India |
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| Abstract: | The O+ ion density measured by the SROSS-C2 satellite during solar minima (year 1995, F10.7 = 77) and maxima (year 2000, F10.7 = 181) has been analyzed for studying diurnal, seasonal, latitudinal and geomagnetic variations. The study region covers an area encompassed between 5-3 5° N latitude and 65-95° E longitude over India at a ~500 km altitude (F2 region). The year 2000 shows significant enhancement in the annual average of O+ ion density and attainment of post sunset secondary enhancement compared to 1995. Attributed to photoionization, daytime shows a maximum ionization compared to nighttime. However, attainment of post sunset secondary maxima is attributed to the strong pre-reversal enhancement in the vertical E x B drift. The effect of geomagnetic activity Kp through the E x B drift dynamic movement on O+ ion density distribution studies indicates periodicities of seven and nine days in 1995 and 2000, respectively, and polynomial dependency of the O+ ion density on geomagnetic activity Kp. Further on, stratification of the O+ ion density according to latitude (5-35° N) indicates high density in mid-latitudes (12-24° N) compared to high and low latitudes, except in the winter of 1995, which shows a distinct trend (i.e., density decreases with increasing latitude). |
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| Keywords: | F2 region pre-reversal enhancement E x B drift: geomagnetic activity (Kp) solar minima and maxima |
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