Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations
We compare the location of the polar cap boundary (PCB) determined using two different techniques, and use them as proxies for the open-closed field line boundary (OCB). Electron temperatures from observations of the EISCAT radar facility are used to estimate the latitude of the PCB along the meridi...
Main Authors: | , , , , , , , |
---|---|
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | unknown |
Published: |
2010
|
Subjects: | |
Online Access: | https://figshare.com/articles/journal_contribution/Comparison_of_the_open-closed_field_line_boundary_location_inferred_using_IMAGE-FUV_SI12_images_and_EISCAT_radar_observations/10114637 |
id |
ftleicesterunfig:oai:figshare.com:article/10114637 |
---|---|
record_format |
openpolar |
spelling |
ftleicesterunfig:oai:figshare.com:article/10114637 2023-05-15T16:04:23+02:00 Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations B. Hubert J-C. Gérard A. T. Aikio T. Pitkänen O. Amm K. Kauristie Steve Milan Stanley W. H. Cowley 2010-04-01T00:00:00Z https://figshare.com/articles/journal_contribution/Comparison_of_the_open-closed_field_line_boundary_location_inferred_using_IMAGE-FUV_SI12_images_and_EISCAT_radar_observations/10114637 unknown 2381/19007 https://figshare.com/articles/journal_contribution/Comparison_of_the_open-closed_field_line_boundary_location_inferred_using_IMAGE-FUV_SI12_images_and_EISCAT_radar_observations/10114637 All Rights Reserved Uncategorized IR content Text Journal contribution 2010 ftleicesterunfig 2021-11-11T20:05:14Z We compare the location of the polar cap boundary (PCB) determined using two different techniques, and use them as proxies for the open-closed field line boundary (OCB). Electron temperatures from observations of the EISCAT radar facility are used to estimate the latitude of the PCB along the meridian of the EISCAT VHF beam. The second method utilizes global images of proton aurora obtained by the IMAGE satellite FUV SI12 instrument. These methods are applied to three different intervals. In two events, the agreement between the methods is good and the mean of the difference is within the resolution of the observations. In a third event, the PCB estimated from EISCAT data is located several degrees poleward of that obtained from the IMAGE FUV SI12 instrument. Comparison of the reconnection electric field estimated from the two methods shows that high-resolution measurements both in time and space are needed to capture the variations in reconnection electric field during substorm expansion. In addition to the two techniques introduced above to determine the PCB location, we also use a search for the location of the reversal of the east-west component of the equivalent current known as the magnetic convection reversal boundary (MCRB). The MCRB from the MIRACLE magnetometer chain mainly follows the motion of the polar cap boundary during different substorm phases, but differences arise near the Harang discontinuity. Other Non-Article Part of Journal/Newspaper EISCAT University of Leicester: Figshare |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized IR content |
spellingShingle |
Uncategorized IR content B. Hubert J-C. Gérard A. T. Aikio T. Pitkänen O. Amm K. Kauristie Steve Milan Stanley W. H. Cowley Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations |
topic_facet |
Uncategorized IR content |
description |
We compare the location of the polar cap boundary (PCB) determined using two different techniques, and use them as proxies for the open-closed field line boundary (OCB). Electron temperatures from observations of the EISCAT radar facility are used to estimate the latitude of the PCB along the meridian of the EISCAT VHF beam. The second method utilizes global images of proton aurora obtained by the IMAGE satellite FUV SI12 instrument. These methods are applied to three different intervals. In two events, the agreement between the methods is good and the mean of the difference is within the resolution of the observations. In a third event, the PCB estimated from EISCAT data is located several degrees poleward of that obtained from the IMAGE FUV SI12 instrument. Comparison of the reconnection electric field estimated from the two methods shows that high-resolution measurements both in time and space are needed to capture the variations in reconnection electric field during substorm expansion. In addition to the two techniques introduced above to determine the PCB location, we also use a search for the location of the reversal of the east-west component of the equivalent current known as the magnetic convection reversal boundary (MCRB). The MCRB from the MIRACLE magnetometer chain mainly follows the motion of the polar cap boundary during different substorm phases, but differences arise near the Harang discontinuity. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
B. Hubert J-C. Gérard A. T. Aikio T. Pitkänen O. Amm K. Kauristie Steve Milan Stanley W. H. Cowley |
author_facet |
B. Hubert J-C. Gérard A. T. Aikio T. Pitkänen O. Amm K. Kauristie Steve Milan Stanley W. H. Cowley |
author_sort |
B. Hubert |
title |
Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations |
title_short |
Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations |
title_full |
Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations |
title_fullStr |
Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations |
title_full_unstemmed |
Comparison of the open-closed field line boundary location inferred using IMAGE-FUV SI12 images and EISCAT radar observations |
title_sort |
comparison of the open-closed field line boundary location inferred using image-fuv si12 images and eiscat radar observations |
publishDate |
2010 |
url |
https://figshare.com/articles/journal_contribution/Comparison_of_the_open-closed_field_line_boundary_location_inferred_using_IMAGE-FUV_SI12_images_and_EISCAT_radar_observations/10114637 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
2381/19007 https://figshare.com/articles/journal_contribution/Comparison_of_the_open-closed_field_line_boundary_location_inferred_using_IMAGE-FUV_SI12_images_and_EISCAT_radar_observations/10114637 |
op_rights |
All Rights Reserved |
_version_ |
1766400014232322048 |