SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs
The Electron Proton Helium Instrument (EPHIN) aboard the Solar Heliospheric Observatory (SOHO) observed several SEP events with protons accelerated to energies E>500 MeV, whereas no neutron monitor (NM) of the worldwide network showed a significant increase in their counting rate. For instance, t...
Main Authors: | , , |
---|---|
Format: | Book Part |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://doi.org/10.38072/2748-3150/p11 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00269-1 https://macau.uni-kiel.de/receive/macau_mods_00001304 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002370/kiel-up_%202748-3150_p11.pdf |
id |
ftunivkiel:oai:macau.uni-kiel.de:macau_mods_00001304 |
---|---|
record_format |
openpolar |
spelling |
ftunivkiel:oai:macau.uni-kiel.de:macau_mods_00001304 2024-06-23T07:56:51+00:00 SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs Bütikofer, Rolf Kühl, Patrick Papaioannou, Athanasios 2021-05-05 https://doi.org/10.38072/2748-3150/p11 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00269-1 https://macau.uni-kiel.de/receive/macau_mods_00001304 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002370/kiel-up_%202748-3150_p11.pdf eng eng NMDB@Home 2020 -- 10.38072/2748-3150/v1 -- 978-3-928794-64-0 -- urn:nbn:de:gbv:8:3-2021-00263-5 -- info:eu-repo/grantAgreement/EC/FP7/213007/EU/Real-Time database for high resolution Neutron Monitor measurements/NMDB https://doi.org/10.38072/2748-3150/p11 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00269-1 https://macau.uni-kiel.de/receive/macau_mods_00001304 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002370/kiel-up_%202748-3150_p11.pdf https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess article Chapter ddc:530 ddc:600 Ground Level Enhancements (GLEs) Solar Energetic Particles (SEPs) neutron monitors Solar and Heliospheric Observatory (SOHO) Electron Proton Helium Instrument (EPHIN) chapter Text doc-type:BookPart 2021 ftunivkiel https://doi.org/10.38072/2748-3150/p1110.38072/2748-3150/v1 2024-06-12T14:18:47Z The Electron Proton Helium Instrument (EPHIN) aboard the Solar Heliospheric Observatory (SOHO) observed several SEP events with protons accelerated to energies E>500 MeV, whereas no neutron monitor (NM) of the worldwide network showed a significant increase in their counting rate. For instance, the SEP event on 8 November 2000 with maximum proton intensity at 500 MeV of >0.1 (cm2 s sr MeV)-1 is outstanding, as this maximum pro-ton flux is comparable with the GLEs on 14 July 2000 and on 15 April 2001 (max. count rate increase in 5-min data of 225% at South Pole NM). In a first step we applied a forward modelling approach of the SEP event on 8 November 2000, i.e. we computed the expected NM count rate increases for selected NM stations, utilizing as input para-meters the SEP spectra determined from EPHIN data as well as anticipated pitch angle distribution and apparent source direction. The simulated count rate increases for selected NM stations showed that this SEP event should have be seen as a clear GLE. To further understand this situation, we investigated in a next step recent GLEs and sub-GLEs. Consequently, a total of four SEP events were selected, two clearly identified GLEs and two sub-GLEs. We performed a “GLE analysis” based on the data of the worldwide network of NMs for each of the four SEP events and then compared the derived SEP spectra with the proton spectra as determined from EPHIN measurements. Book Part South pole MACAU: Open Access Repository of Kiel University South Pole 89 95 |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
article Chapter ddc:530 ddc:600 Ground Level Enhancements (GLEs) Solar Energetic Particles (SEPs) neutron monitors Solar and Heliospheric Observatory (SOHO) Electron Proton Helium Instrument (EPHIN) |
spellingShingle |
article Chapter ddc:530 ddc:600 Ground Level Enhancements (GLEs) Solar Energetic Particles (SEPs) neutron monitors Solar and Heliospheric Observatory (SOHO) Electron Proton Helium Instrument (EPHIN) Bütikofer, Rolf Kühl, Patrick Papaioannou, Athanasios SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs |
topic_facet |
article Chapter ddc:530 ddc:600 Ground Level Enhancements (GLEs) Solar Energetic Particles (SEPs) neutron monitors Solar and Heliospheric Observatory (SOHO) Electron Proton Helium Instrument (EPHIN) |
description |
The Electron Proton Helium Instrument (EPHIN) aboard the Solar Heliospheric Observatory (SOHO) observed several SEP events with protons accelerated to energies E>500 MeV, whereas no neutron monitor (NM) of the worldwide network showed a significant increase in their counting rate. For instance, the SEP event on 8 November 2000 with maximum proton intensity at 500 MeV of >0.1 (cm2 s sr MeV)-1 is outstanding, as this maximum pro-ton flux is comparable with the GLEs on 14 July 2000 and on 15 April 2001 (max. count rate increase in 5-min data of 225% at South Pole NM). In a first step we applied a forward modelling approach of the SEP event on 8 November 2000, i.e. we computed the expected NM count rate increases for selected NM stations, utilizing as input para-meters the SEP spectra determined from EPHIN data as well as anticipated pitch angle distribution and apparent source direction. The simulated count rate increases for selected NM stations showed that this SEP event should have be seen as a clear GLE. To further understand this situation, we investigated in a next step recent GLEs and sub-GLEs. Consequently, a total of four SEP events were selected, two clearly identified GLEs and two sub-GLEs. We performed a “GLE analysis” based on the data of the worldwide network of NMs for each of the four SEP events and then compared the derived SEP spectra with the proton spectra as determined from EPHIN measurements. |
format |
Book Part |
author |
Bütikofer, Rolf Kühl, Patrick Papaioannou, Athanasios |
author_facet |
Bütikofer, Rolf Kühl, Patrick Papaioannou, Athanasios |
author_sort |
Bütikofer, Rolf |
title |
SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs |
title_short |
SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs |
title_full |
SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs |
title_fullStr |
SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs |
title_full_unstemmed |
SEP spectra derived from neutron monitor data and from EPHIN space detector data during recent GLEs and sub-GLEs |
title_sort |
sep spectra derived from neutron monitor data and from ephin space detector data during recent gles and sub-gles |
publishDate |
2021 |
url |
https://doi.org/10.38072/2748-3150/p11 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00269-1 https://macau.uni-kiel.de/receive/macau_mods_00001304 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002370/kiel-up_%202748-3150_p11.pdf |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
NMDB@Home 2020 -- 10.38072/2748-3150/v1 -- 978-3-928794-64-0 -- urn:nbn:de:gbv:8:3-2021-00263-5 -- info:eu-repo/grantAgreement/EC/FP7/213007/EU/Real-Time database for high resolution Neutron Monitor measurements/NMDB https://doi.org/10.38072/2748-3150/p11 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2021-00269-1 https://macau.uni-kiel.de/receive/macau_mods_00001304 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00002370/kiel-up_%202748-3150_p11.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.38072/2748-3150/p1110.38072/2748-3150/v1 |
container_start_page |
89 |
op_container_end_page |
95 |
_version_ |
1802650207286984704 |