Title: Magnetospheric electric field measurements with balloons
Abstract: Journal of Geophysical Research (1896-1977)Volume 74, Issue 19 p. 4739-4754 Magnetospheric electric field measurements with balloons F. S. Mozer, F. S. MozerSearch for more papers by this authorR. Serlin, R. SerlinSearch for more papers by this author F. S. Mozer, F. S. MozerSearch for more papers by this authorR. Serlin, R. SerlinSearch for more papers by this author First published: 1 September 1969 https://doi.org/10.1029/JA074i019p04739Citations: 197AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Abstract Two balloons have been flown from Fort Churchill, Canada, in August 1968 to measure horizontal and vertical electric fields. It is shown theoretically and experimentally that horizontal upper atmospheric electric fields are generally equal to one-second, several hundred kilometer averages of the horizontal ionospheric electric field. Analyses of thirty-five hours of data obtained during quiet and active periods yield the following conclusions. The average equatorial electric field strength was 0.6 mv/m during a quiet period and 1.0 mv/m during an active period. During magnetic bays, ground-based magnetometers principally measured Hall currents whose variations depended on conductivity changes as much or more than on electric field variations. For a period of about 30 minutes before the onset of a negative bay near local midnight, the ionospheric electric field pointed westward, indicating radially inward flow in the equatorial plane. This result is interpreted in terms of a model of the magnetospheric substorm in which bays are triggered deep within the magnetosphere by an instability associated with a radial plasma density gradient established by convective flow. The average electric field in the dayside ionosphere was about an order of magnitude smaller than that at night, suggesting that the dayside magnetosphere tended to corotate with the earth. Equipotential contours of the electric field in the equatorial plane are constructed based on this and other hypotheses. Citing Literature Volume74, Issue19Space Physics1 September 1969Pages 4739-4754 RelatedInformation
Publication Year: 1969
Publication Date: 1969-09-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 224
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot