A revised corrected geomagnetic coordinate system for Epochs 1985 and 1990

Gustafsson, G.; Papitashvili, N. E.; Papitashvili, V. O.

doi:10.1016/0021-9169(92)90167-j

Cited by 147 publications

(112 citation statements)

References 3 publications

Supporting

Mentioning

110

Contrasting

Order By: Relevance

“…In the next step, the geocentric latitude, longitude and altitude parameters of each satellite trajectory which fell into the campaign hours were converted into AACGM coordinates (a system grown out of a combination of CGM and PACE coordinates, see Baker and Wing (1989) and Gustafsson et al (1992)). …”

Section: Analysis Methodsmentioning

confidence: 99%

Are small-scale field-aligned currents and magnetosheath-like particle precipitation signatures of the same low-altitude cusp?

Watermann

Stauning

Lühr

et al. 2009

Advances in Space Research

View full text Add to dashboard Cite

Are small-scale field-aligned currents and magnetosheath-like particle precipitation signatures of the same low-altitude cusp? AbstractWe examined some 75 observations from the low altitude Earth orbiting DMSP, Ørsted and CHAMP satellites which were taken in the region of the nominal cusp. Our objective was to determine whether the actually observed cusp locations as inferred from magnetosheath-like particle precipitation ("particle cusp") and intense small-scale magnetic field variations ("current cusp"), respectively, were identical and were consistent with the statistically expected latitude of the cusp derived from a huge number of charged particle spectrograms ("statistical cusp").The geocentric coordinates of the satellites were converted into AACGM coordinates, and the geomagnetic latitude of the cusp boundaries (as indicated by precipitating particles and small-scale field-aligned currents) set in relation to the IMF-B z dependent latitude of the equatorward boundary of the statistical cusp.We find that the actually observed latitude of the particle cusp matches well the statistically expected latitude while the current cusp appears to cover most of the statistical cusp and also a ≈1 • wide section beyond the equatorward boundary of the statistical cusp. This leads us to suggest that intense small-scale field-aligned currents are generated in the cusp but also in the transition zone between the lowlatitude boundary layer (LLBL) and the cusp, probably within both regimes, the cusp and the open LLBL. The small-scale field-aligned currents are possibly a consequence of turbulence and/or instabilities associated with the process of opening Preprint submitted to Elsevier 26 March 2009previously closed magnetospheric field lines and merging them with the interplanetary magnetic field.

show abstract

Section: Analysis Methodsmentioning

confidence: 99%

Are small-scale field-aligned currents and magnetosheath-like particle precipitation signatures of the same low-altitude cusp?

Watermann

Stauning

Lühr

et al. 2009

Advances in Space Research

View full text Add to dashboard Cite

show abstract

“…The second adjustment involves the coordinate systems used. The magnetic coordinates used by Zhang & Paxton (2008) are the Altitude Adjusted CGM coordinates (AACGM) of Baker & Wing (1989) and Bhavnani & Hein (1994) while IRI uses the Corrected Geo-Magnetic (CGM) coordinates of Gustafsson et al (1992). Both coordinate systems use the International Geomagnetic Reference Field (Finlay et al 2010) to trace from a point in space to the dipole geomagnetic equator and then trace back down along the dipole field line returning to the same altitude (CGM) or to the ground (AACGM) and use the so found geographic coordinates as the CGM or AACGM coordinates for the original point in space.…”

Section: Auroral Boundariesmentioning

confidence: 99%

The International Reference Ionosphere 2012 – a model of international collaboration

Bilitza

Altadill²,

Zhang

et al. 2014

J. Space Weather Space Clim.

552

347

View full text Add to dashboard Cite

The International Reference Ionosphere (IRI) project was established jointly by the Committee on Space Research (COSPAR) and the International Union of Radio Science (URSI) in the late sixties with the goal to develop an international standard for the specification of plasma parameters in the Earth's ionosphere. COSPAR needed such a specification for the evaluation of environmental effects on spacecraft and experiments in space, and URSI for radiowave propagation studies and applications. At the request of COSPAR and URSI, IRI was developed as a data-based model to avoid the uncertainty of theory-based models which are only as good as the evolving theoretical understanding. Being based on most of the available and reliable observations of the ionospheric plasma from the ground and from space, IRI describes monthly averages of electron density, electron temperature, ion temperature, ion composition, and several additional parameters in the altitude range from 60 km to 2000 km. A working group of about 50 international ionospheric experts is in charge of developing and improving the IRI model. Over time as new data became available and new modeling techniques emerged, steadily improved editions of the IRI model have been published. This paper gives a brief history of the IRI project and describes the latest version of the model, IRI-2012. It also briefly discusses efforts to develop a real-time IRI model. The IRI homepage is at http://IRImodel.org.

show abstract

“…This procedure to calculate the ionospheric conductivity is essentially the same as was used by Fujii and Iijima (1987). We also note that χ used here is not the solar zenith angle at the satellite altitude (835 km) but that at an altitude of 110 km traced along the field line from the satellite; we have used the AACGM (Altitude Adjusted Corrected Geomagnetic) coordinates (Gustafsson et al, 1992) for the field line tracing. Moen and Brekke (1993) presented a different formula to express the χ-dependence of P in mho, that is,…”

Section: Ionospheric Conductivity Modelsmentioning

confidence: 99%

Ionospheric conductivity dependence of dayside region-0, 1, and 2 field-aligned current systems: statistical study with DMSP-F7

et al. 2004

View full text Add to dashboard Cite

Abstract. The present study statistically examines the dependence of the intensities of dayside (MLT=8-12 h) large-scale field-aligned currents (FACs) on the ionospheric conductance using the summary data of DMSP-F7 constructed by the procedure of Higuchi and Ohtani (2000). We have found that, in the dayside region, R1 and R0 have a higher correlation between ionospheric conductivity and FAC intensity than R2, suggesting that R0 and R1 are driven by a more voltage-like source than R2. This result is consistent with the idea that R1 and R0 are driven by the interaction between the solar wind and the open magnetospheric magnetic field. We have also found that dayside FAC intensities are latitudinally well balanced when they have a three sheet structure (R0, R1 and R2); on the other hand, for a two sheet structure (R1 and R2), the intensity of R1 is larger than that of R2, so that the net current has the polarity of R1.

show abstract

A revised corrected geomagnetic coordinate system for Epochs 1985 and 1990

Cited by 147 publications

References 3 publications

Are small-scale field-aligned currents and magnetosheath-like particle precipitation signatures of the same low-altitude cusp?

Are small-scale field-aligned currents and magnetosheath-like particle precipitation signatures of the same low-altitude cusp?

The International Reference Ionosphere 2012 – a model of international collaboration

Ionospheric conductivity dependence of dayside region-0, 1, and 2 field-aligned current systems: statistical study with DMSP-F7

Contact Info

Product

Resources

About