Abstract
ABSTRACTIn an earlier study of the effect of some Mogel-Dellinger type of fade-outs at several stations, it was found that, after the fade-out, the trend of variation of the deviation Δf of F-2 critical frequency from the mean had a phase reversal at about 14°N geomagnetic latitude1. Three of the selected fade-outs and flares associated with them had started before ground sunrise at the Indian Stations. This paper deals with further investigation of the possible effect of solar flares on F layer critical frequency, f0F during the presunrise period. The analysis carried out for a large number of flares shows consistent results at stations in India and Japan. The flare associated changes in f0F at lower latitude stations are found to be opposite in phase to those at higher latitude ones. At Ahmedabad (14°N representing a lower latitude station) Δf becomes negative after flares corresponding to the period 0100–0400 hrs. local time, whereas for flares corresponding to 0400–0500 hrs. local time it becomes posi...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
