Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time
Abstract We analyze a set of events in which both electron flux dropouts caused by magnetopause shadowing and geosynchronous magnetopause crossings (GMCs) are observed. These observations are compared to event‐specific last closed drift shell (LCDS) models derived from the TS05 and TS07 external fie...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2022-08-01
|
| Series: | Space Weather |
| Online Access: | https://doi.org/10.1029/2022SW003105 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850117856960708608 |
|---|---|
| author | Thomas A. Daggitt Richard B. Horne Sarah A. Glauert Giulio DelZanna Mervyn P. Freeman |
| author_facet | Thomas A. Daggitt Richard B. Horne Sarah A. Glauert Giulio DelZanna Mervyn P. Freeman |
| author_sort | Thomas A. Daggitt |
| collection | DOAJ |
| description | Abstract We analyze a set of events in which both electron flux dropouts caused by magnetopause shadowing and geosynchronous magnetopause crossings (GMCs) are observed. These observations are compared to event‐specific last closed drift shell (LCDS) models derived from the TS05 and TS07 external field models and magnetopause standoff distance. The LCDS models show good association with losses due to magnetopause shadowing but fail to reproduce observations of GMCs on the timescale of minutes. We show that different satellites in geostationary orbit observe different trends in electron flux during storm events on timescales of less than a day due to their separation in longitude. These differences demonstrate that both satellite L* and magnetic local time must be taken into account when modeling rapid variations in the outer radiation belt, and at least three satellites in geostationary orbit, ideally more, may be required for accurate forecasting and reconstruction of these events on timescales shorter than days. |
| format | Article |
| id | doaj-art-b6f137c42975475cb07e39e03973bdd7 |
| institution | OA Journals |
| issn | 1542-7390 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-b6f137c42975475cb07e39e03973bdd72025-08-20T02:36:00ZengWileySpace Weather1542-73902022-08-01208n/an/a10.1029/2022SW003105Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local TimeThomas A. Daggitt0Richard B. Horne1Sarah A. Glauert2Giulio DelZanna3Mervyn P. Freeman4British Antartic Survey Cambridge UKBritish Antartic Survey Cambridge UKBritish Antartic Survey Cambridge UKDepartment of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge UKBritish Antartic Survey Cambridge UKAbstract We analyze a set of events in which both electron flux dropouts caused by magnetopause shadowing and geosynchronous magnetopause crossings (GMCs) are observed. These observations are compared to event‐specific last closed drift shell (LCDS) models derived from the TS05 and TS07 external field models and magnetopause standoff distance. The LCDS models show good association with losses due to magnetopause shadowing but fail to reproduce observations of GMCs on the timescale of minutes. We show that different satellites in geostationary orbit observe different trends in electron flux during storm events on timescales of less than a day due to their separation in longitude. These differences demonstrate that both satellite L* and magnetic local time must be taken into account when modeling rapid variations in the outer radiation belt, and at least three satellites in geostationary orbit, ideally more, may be required for accurate forecasting and reconstruction of these events on timescales shorter than days.https://doi.org/10.1029/2022SW003105 |
| spellingShingle | Thomas A. Daggitt Richard B. Horne Sarah A. Glauert Giulio DelZanna Mervyn P. Freeman Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time Space Weather |
| title | Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time |
| title_full | Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time |
| title_fullStr | Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time |
| title_full_unstemmed | Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time |
| title_short | Variations in Observations of Geosynchronous Magnetopause and Last Closed Drift Shell Crossings With Magnetic Local Time |
| title_sort | variations in observations of geosynchronous magnetopause and last closed drift shell crossings with magnetic local time |
| url | https://doi.org/10.1029/2022SW003105 |
| work_keys_str_mv | AT thomasadaggitt variationsinobservationsofgeosynchronousmagnetopauseandlastcloseddriftshellcrossingswithmagneticlocaltime AT richardbhorne variationsinobservationsofgeosynchronousmagnetopauseandlastcloseddriftshellcrossingswithmagneticlocaltime AT sarahaglauert variationsinobservationsofgeosynchronousmagnetopauseandlastcloseddriftshellcrossingswithmagneticlocaltime AT giuliodelzanna variationsinobservationsofgeosynchronousmagnetopauseandlastcloseddriftshellcrossingswithmagneticlocaltime AT mervynpfreeman variationsinobservationsofgeosynchronousmagnetopauseandlastcloseddriftshellcrossingswithmagneticlocaltime |