Ion-cyclotron noise excitation in the topside ionosphere according to observations at the Intercosmos-14 satellite |
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| Affiliation: | 1. Université de Rennes 1, Ethologie Animale et Humaine–EthoS, U.M.R 6552-C.N.R.S., Station Biologique, Paimpont, France;2. University of St Andrews, School of Psychology and Neuroscience, St Andrews, Fife, U.K.;3. Centre Suisse de Recherches Scientifiques, Taï Monkey Project, Adiopodoumé, Abidjan, Côte d''Ivoire;4. Laboratoire de Zoologie et Biologie Animale, Université Félix Houphouët-Boigny, Abidjan, Côte d''Ivoire;5. Indian Institute of Science Education and Research Thiruvananthapuram, Centre for Research and Education in Ecology and Evolution, Thiruvananthapuram, India;6. Adam Mickiewicz University in Poznan, Institute of Anthropology, Poznań, Poland;7. Université de Neuchâtel, Institut de Biologie, Neuchâtel, Switzerland;1. Environmental Information Institute, Navigation College, Dalian Maritime University, Dalian, 116026, China;2. Institute of AI & Robotics, Academy for Engineering & Technology, Fudan University, Shanghai, 200433, China;1. School of Materials Science and Engineering, The University of New South Wales, NSW 2052, Sydney, Australia;2. Institute of Minerals and Materials Technology, Advanced Materials Technology Department, Bhubaneshwar, Orissa 751013, India;3. Facultad de Ingenieria, Universidad Andres Bello. Antonio Varas 880, Providencia, Santiago, Chile |
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| Abstract: | A band-limited ELF emission having very distinct upper as well as lower cutoff frequencies, most probably determined by local parameters of the plasma, were discovered by the VLF experiment on board the Intercosmos-14 satellite (apogee height 1707 km, perigee 345 km; inclination 74°). This type of noise was observed in the day-time, at middle and low latitudes, at altitudes 600 km< h < 1400 km. The very clear case observed on March 5, 1976 is discussed in detail and arguments are listed that this ELF emission is locally generated ion-cyclotron noise. Calculations of the growth of the proton cyclotron resonance instability show that the growth may be positive if the loss cone angle of the energetic protons is sufficiently great. This condition is fulfilled at low altitudes near the mirror points. Depending on the width of the distribution function of energetic protons the growth of the Instability may be positive in the whole frequency band of the proton branch of ion-cyclotron waves or only in certain parts of that frequency band. |
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