2704 Auroral phenomena (2407); 2716 Energetic particles; precipitating; 2784 Solar wind/magnetosphere interactions; 2788 Storms and substorms
Abstract :
[en] Data from the IMAGE Wide-band Imaging Camera (WIC),sensitive to far ultraviolet auroras and from the Spectrographic Imager (SI) channel SI12, sensitive to proton precipitation induced Lyman alpha, were analyzed during a high altitude orbit segment of the IMAGE spacecraft. This segment began during the expansive phase of a substorm. The aurora developed into a double oval configuration, consisting of a set of discrete poleward forms and a separate diffuse auroral oval equatorwards. Although IMF Bz was negative, considerable activity could be seen poleward of the high latitude arcs in the polar cap region. The optical signature of precipitating protons showed that the proton aurora was on the equatorward side of the diffuse aurora and there was a lack of intense energetic proton fluxes in the poleward arcs. A simultaneous FAST pass provided a diagnostic of the particle types in the various regions. These data showed that lower intensity protons were present throughout the entire double oval configuration but with insufficient intensity to produce aurora that could be observed by IMAGE. The FAST data also showed that the bright poleward discrete arcs were accelerated by electrostatic processes, and the wave accelerated electrons were located on the poleward edge of these features.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mende, S. B.; Space Sciences Laboratory, University of California, Berkeley, Centennial Drive at Grizzly Peak Blvd, Berkeley, CA 94720 United States
Frey, H. U.; Space Sciences Laboratory, University of California, Berkeley, Centennial Drive at Grizzly Peak Blvd, Berkeley, CA 94720 United States
Carlson, C.; Space Sciences Laboratory, University of California, Berkeley, Centennial Drive at Grizzly Peak Blvd, Berkeley, CA 94720 United States
Immel, T.; Space Sciences Laboratory, University of California, Berkeley, Centennial Drive at Grizzly Peak Blvd, Berkeley, CA 94720 United States
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Hubert, Benoît ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Fuselier, S.; Lockheed-Martin Palo Alto Research Laboratories, 3251 Hanover Street, Palo Alto, CA 94304 United States
Spann, J.; NASA HQ Code SR, Cod SR, Washington, DC, 20546 United States
Gladstone, R.; Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228 United States
Burch, J. L.; Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228 United States
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.