What are the causes for the spread of GLE parameters deduced from NM data?

Bütikofer, Rolf; Flückiger, Erwin (August 2015). What are the causes for the spread of GLE parameters deduced from NM data? Journal of Physics Conference Series, 632(1), 012053. IOPScience 10.1088/1742-6596/632/1/012053

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Investigations have shown that the analysis results of ground level enhancements (GLEs) based on neutron monitor (NM) data for a selected event can differ considerably depending the procedure used. This may have significant consequences e.g. for the assessment of radiation doses at flight altitudes. The reasons for the spread of the GLE parameters deduced from NM data can be manifold and are at present unclear. They include differences in specific properties of the various analysis procedures (e.g. NM response functions, different ways in taking into account the dynamics of the Earth’s magnetospheric field), different characterisations of the solar particle flux near Earth as well as the specific selection of NM stations used for the analysis. In the present paper we quantitatively investigate this problem for a time interval during the maximum phase of the GLE on 13 December 2006. We present and discuss the changes in the resulting GLE parameters when using different NM response functions, different model representations of the Earth’s magnetospheric field as well as different assumptions for the solar particle spectrum and pitch angle distribution near Earth. The results of the study are expected to yield a basis for the reduction in the spread of the GLE parameters deduced from NM data.

Item Type:

Conference or Workshop Item (Paper)

Division/Institute:

08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Bütikofer, Rolf and Flückiger, Erwin

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science
500 Science > 530 Physics

Publisher:

IOPScience

Language:

English

Submitter:

Rolf Bütikofer

Date Deposited:

07 Jan 2016 16:16

Last Modified:

07 Jan 2016 16:16

Publisher DOI:

10.1088/1742-6596/632/1/012053

BORIS DOI:

10.7892/boris.74461

URI:

https://boris.unibe.ch/id/eprint/74461

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