Thermospheric response to ion heating in the dayside cusp |
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| Institution: | 1. Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum 695022, India;2. National Remote Sensing Centre, Hyderabad, India;1. Laboratorio de Física e Astronomia, Universidade do Vale do Paraiba (UNIVAP), Av Shishima Hifumi, 2911, Urbanova, 12244-000 Sao Jose dos Campos, SP, Brazil;2. Unidade Academica de Fisica, Universidade Federal de Campina Grande (UFCG), Av. Aprigio Veloso, 882 – Bloco CY – Bairro Universitario, 58.109-970 Campina Grande, PB, Brazil;3. Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 12.227-010 Sao José dos Campos, SP, Brazil;4. Departamento de Física, Universidade Estadual da Paraíba, Rua da Baraúnas, 351, Bairro Universitário, Campina Grande, PB, Brazil;1. Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli 627011, India;2. National Atmospheric Research Laboratory, Gadanki 517112, India;3. Indian Institute of Geomagnetism, Navi Mumbai 410218, India |
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| Abstract: | Recent observations from the CHAMP satellite indicate that neutral density enhancements are common in the northern dayside cusp. The neutral density in this region can be nearly a factor of 2 larger than in adjacent regions of the thermosphere on the poleward and equatorward sides of the cusp. The presence of density enhancements implies that the neutral atmosphere is being heated in the cusp region causing upwelling. A high-resolution model of the global thermosphere is used to study the thermospheric response to heating in the northern dayside cusp. It is found that heating in the cusp results in the creation of a neutral fountain. Specifically, upward drift of the thermosphere within the cusp region is followed at higher altitudes by poleward and equatorward movement out of the cusp region and the gradual subsidence of the neutral gas. Density enhancements of the magnitude observed by the CHAMP satellite occur in the model results for sufficiently strong heating in the cusp. Neutral temperature enhancements also occur and are strongest near the poleward and equatorward boundaries of the cusp region. |
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