Uncovering the nonadiabatic response of geosynchronous electrons to geomagnetic disturbance
Journal of Geophysical Research
By: Jennifer Gannon, Scot R. Elkington, and Terrance G. Onsager
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Abstract
We describe an energy spectrum method for scaling electron integral flux, which is measured at a constant energy, to phase space density at a constant value of the first adiabatic invariant which removes much of the variation due to reversible adiabatic effects. Applying this method to nearly a solar cycle (1995 - 2006) of geosynchronous electron integral flux (E>2.0MeV) from the GOES satellites, we see that much of the diurnal variation in electron phase space density at constant energy can be removed by the transformation to phase space density at constant μ (4000 MeV/G). This allows us a clearer picture of underlying non-adiabatic electron population changes due to geomagnetic activity. Using scaled phase space density, we calculate the percentage of geomagnetic storms resulting in an increase, decrease or no change in geosynchronous electrons as 38%, 7%, and 55%, respectively. We also show examples of changes in the electron population that may be different than the unscaled fluxes alone suggest. These examples include sudden electron enhancements during storms which appear during the peak of negative Dst for μ-scaled phase space density, contrary to the slow increase seen during the recovery phase for unscaled phase space density for the same event.
Suggested Citation
Gannon, J., Elkington, S.R., and Onsager, T.G., 2012, Uncovering the nonadiabatic response of geosynchronous electrons to geomagnetic disturbance: Journal of Geophysical Research, v. 117, no. A10, A10215, 7 p., https://doi.org/10.1029/2012JA017543.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Uncovering the nonadiabatic response of geosynchronous electrons to geomagnetic disturbance |
| Series title | Journal of Geophysical Research |
| DOI | 10.1029/2012JA017543 |
| Volume | 117 |
| Issue | A10 |
| Publication Date | October 12, 2012 |
| Year Published | 2012 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | A10215, 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geophysical Research |