IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere
It is known that the electric field pattern at high latitudes depends on the polarity of the <i>Y</i> component of the interplanetary magnetic field (IMF <i>B<sub>Y</sub></i>) and season. In this study, we investigate the seasonal and <i>B<sub>Y</...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2005-10-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/23/2671/2005/angeo-23-2671-2005.pdf |
| _version_ | 1811284425050161152 |
|---|---|
| author | H. Matsui J. M. Quinn R. B. Torbert V. K. Jordanova P. A. Puhl-Quinn G. Paschmann |
| author_facet | H. Matsui J. M. Quinn R. B. Torbert V. K. Jordanova P. A. Puhl-Quinn G. Paschmann |
| author_sort | H. Matsui |
| collection | DOAJ |
| description | It is known that the electric field pattern at high latitudes depends on the
polarity of the <i>Y</i> component of the interplanetary magnetic field (IMF <i>B<sub>Y</sub></i>)
and season. In this study, we investigate the seasonal and <i>B<sub>Y</sub></i> dependences in
the inner magnetosphere using the perigee (4<<i>L</i><10) Cluster data taken from
low magnetic latitudes. The data consist of both components of the electric
field perpendicular to the magnetic field, obtained by the electron drift
instrument (EDI), which is based on a newly developed technique, well suited for
measurement of the electric fields in the inner magnetosphere. These data are
sorted by the polarities of IMF <i>B<sub>Z</sub></i> and <i>B<sub>Y</sub></i>, and by seasons or hemispheres.
It is demonstrated from our statistics that the electric fields in the
inner magnetosphere depend on these quantities. The following three points are
inferred: 1) The electric fields exhibit some differences statistically
between Cluster locations at the Northern and Southern Hemispheres with the same
dipole <i>L</i> and magnetic local time (MLT) values and during the
same IMF conditions. These differences in the electric fields might result from
hemispherical differences in magnetic field geometry and/or those in
field-aligned potential difference.
2) The IMF <i>B<sub>Y</sub></i> and seasonal dependence of the dawnside and duskside
electric fields at 4<<i>L</i><10 is consistent with that seen in the polar
convection cell. In addition, it is possible that these dependences are affected
by the ionospheric conductivity and the field-aligned current.
3) The nightside electric field in the inner magnetosphere measured by Cluster
is often similar to that in the magnetotail lobe. In the future, it will be
necessary to incorporate these dependencies on IMF <i>B<sub>Y</sub></i> and season into
a realistic model of the inner magnetospheric convection electric field.<br><br>
<b>Keywords.</b> Magnetospheric physics (Electric fields;
Magnetosphere-ionosphere interactions; Solar windmagnetosphere
interactions) |
| first_indexed | 2024-04-13T02:29:19Z |
| format | Article |
| id | doaj.art-5d68c3d1082d47b0b82de34760d11770 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-13T02:29:19Z |
| publishDate | 2005-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-5d68c3d1082d47b0b82de34760d117702022-12-22T03:06:39ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762005-10-01232671267810.5194/angeo-23-2671-2005IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphereH. Matsui0J. M. Quinn1R. B. Torbert2V. K. Jordanova3P. A. Puhl-Quinn4G. Paschmann5Space Science Center, University of New Hampshire, Durham, NH 03824, USASpace Science Center, University of New Hampshire, Durham, NH 03824, USASpace Science Center, University of New Hampshire, Durham, NH 03824, USASpace Science Center, University of New Hampshire, Durham, NH 03824, USASpace Science Center, University of New Hampshire, Durham, NH 03824, USAMax-Planck-Institut für extraterrestrische Physik, 85748 Garching, GermanyIt is known that the electric field pattern at high latitudes depends on the polarity of the <i>Y</i> component of the interplanetary magnetic field (IMF <i>B<sub>Y</sub></i>) and season. In this study, we investigate the seasonal and <i>B<sub>Y</sub></i> dependences in the inner magnetosphere using the perigee (4<<i>L</i><10) Cluster data taken from low magnetic latitudes. The data consist of both components of the electric field perpendicular to the magnetic field, obtained by the electron drift instrument (EDI), which is based on a newly developed technique, well suited for measurement of the electric fields in the inner magnetosphere. These data are sorted by the polarities of IMF <i>B<sub>Z</sub></i> and <i>B<sub>Y</sub></i>, and by seasons or hemispheres. It is demonstrated from our statistics that the electric fields in the inner magnetosphere depend on these quantities. The following three points are inferred: 1) The electric fields exhibit some differences statistically between Cluster locations at the Northern and Southern Hemispheres with the same dipole <i>L</i> and magnetic local time (MLT) values and during the same IMF conditions. These differences in the electric fields might result from hemispherical differences in magnetic field geometry and/or those in field-aligned potential difference. 2) The IMF <i>B<sub>Y</sub></i> and seasonal dependence of the dawnside and duskside electric fields at 4<<i>L</i><10 is consistent with that seen in the polar convection cell. In addition, it is possible that these dependences are affected by the ionospheric conductivity and the field-aligned current. 3) The nightside electric field in the inner magnetosphere measured by Cluster is often similar to that in the magnetotail lobe. In the future, it will be necessary to incorporate these dependencies on IMF <i>B<sub>Y</sub></i> and season into a realistic model of the inner magnetospheric convection electric field.<br><br> <b>Keywords.</b> Magnetospheric physics (Electric fields; Magnetosphere-ionosphere interactions; Solar windmagnetosphere interactions)https://www.ann-geophys.net/23/2671/2005/angeo-23-2671-2005.pdf |
| spellingShingle | H. Matsui J. M. Quinn R. B. Torbert V. K. Jordanova P. A. Puhl-Quinn G. Paschmann IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere Annales Geophysicae |
| title | IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere |
| title_full | IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere |
| title_fullStr | IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere |
| title_full_unstemmed | IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere |
| title_short | IMF <i>B<sub>Y</sub></i> and the seasonal dependences of the electric field in the inner magnetosphere |
| title_sort | imf i b sub y sub i and the seasonal dependences of the electric field in the inner magnetosphere |
| url | https://www.ann-geophys.net/23/2671/2005/angeo-23-2671-2005.pdf |
| work_keys_str_mv | AT hmatsui imfibsubysubiandtheseasonaldependencesoftheelectricfieldintheinnermagnetosphere AT jmquinn imfibsubysubiandtheseasonaldependencesoftheelectricfieldintheinnermagnetosphere AT rbtorbert imfibsubysubiandtheseasonaldependencesoftheelectricfieldintheinnermagnetosphere AT vkjordanova imfibsubysubiandtheseasonaldependencesoftheelectricfieldintheinnermagnetosphere AT papuhlquinn imfibsubysubiandtheseasonaldependencesoftheelectricfieldintheinnermagnetosphere AT gpaschmann imfibsubysubiandtheseasonaldependencesoftheelectricfieldintheinnermagnetosphere |