Amm, O., Donovan, E. F., Frey, H., Lester, M., Nakamura, R., Wild, J. A., ...
A little more than four years after its launch, the first magnetospheric, multi-satellite mission Cluster has already tremendously contributed to our understanding about the coupled solar wind -...
Localized fast flow disturbance observed in the plasma sheet and in the ionosphere (2008)
Nakamura, R., Amm, O., Laakso, H., Draper, N. C., Lester, M., Grocott, A., ...
An isolated plasma sheet flow burst took place at 22:02 UT, 1 September 2002, when the Cluster footpoint was located within the area covered by the Magnetometers-Ionospheric Radars-All-sky Cameras...
Lockwood, M., Fazakerley, A., Opgenoorth, H., Moen, J., Van Eyken, A. P., Dunlop, M., ...
We study a series of transient entries into the low-latitude boundary layer (LLBL) of all four Cluster spacecraft during an outbound pass through the mid-afternoon magnetopause ( [ XGSM, YGSM, ZGSM ]...
Opgenoorth, H. J., Lockwood, M., Alcaydé, D., Donovan, E., Engebretson, M. J., Van Eyken, A. P., ...
On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside...
Lockwood, M., Mccrea, I. W., Milan, S. E., Moen, J., Cerisier, J. C., Thorolfsson, A.
We report high-resolution observations of the southward-IMF cusp/cleft ionosphere made on December 16th 1998 by the EISCAT (European incoherent scatter) Svalbard radar (ESR), and compare them with...
ESR and EISCAT observations of the response of the cusp and cleft to IMF orientation changes (2008)
Mccrea, I. W., Lockwood, M., Moen, J., Pitout, F., Eglitis, P., Aylward, A. D., ...
We report observations of the cusp/cleft ionosphere made on December 16th 1998 by the EISCAT (European incoherent scatter) VHF radar at Tromsø and the EISCAT Svalbard radar (ESR). We compare them...
Amm, O., Donovan, E. F., Frey, H., Lester, M., Nakamura, R., Wild, J. A., ...
A little more than four years after its launch, the first magnetospheric, multi-satellite mission Cluster has already tremendously contributed to our understanding about the coupled solar wind -...
Localized fast flow disturbance observed in the plasma sheet and in the ionosphere (2008)
Nakamura, R., Amm, O., Laakso, H., Draper, N. C., Lester, M., Grocott, A., ...
An isolated plasma sheet flow burst took place at 22:02 UT, 1 September 2002, when the Cluster footpoint was located within the area covered by the Magnetometers-Ionospheric Radars-All-sky Cameras...
Lockwood, M., Fazakerley, A., Opgenoorth, H., Moen, J., Van Eyken, A. P., Dunlop, M., ...
We study a series of transient entries into the low-latitude boundary layer (LLBL) of all four Cluster spacecraft during an outbound pass through the mid-afternoon magnetopause ( [ XGSM, YGSM, ZGSM ]...
Opgenoorth, H. J., Lockwood, M., Alcaydé, D., Donovan, E., Engebretson, M. J., Van Eyken, A. P., ...
On 14 January 2001, the four Cluster spacecraft passed through the northern magnetospheric mantle in close conjunction to the EISCAT Svalbard Radar (ESR) and approached the post-noon dayside...
Lockwood, M., Mccrea, I. W., Milan, S. E., Moen, J., Cerisier, J. C., Thorolfsson, A.
We report high-resolution observations of the southward-IMF cusp/cleft ionosphere made on December 16th 1998 by the EISCAT (European incoherent scatter) Svalbard radar (ESR), and compare them with...
ESR and EISCAT observations of the response of the cusp and cleft to IMF orientation changes (2008)
Mccrea, I. W., Lockwood, M., Moen, J., Pitout, F., Eglitis, P., Aylward, A. D., ...
We report observations of the cusp/cleft ionosphere made on December 16th 1998 by the EISCAT (European incoherent scatter) VHF radar at Tromsø and the EISCAT Svalbard radar (ESR). We compare them...
A first comparison of irregularity and ion drift velocity measurements in the E-region (2008)
Makarevich, R. A., Honary, F., Howells, V. S. C., Koustov, A. V., Milan, S. E., Davies, J. A., ...
E-region irregularity velocity measurements at large flow angles with the STARE Finland coherent VHF radar are considered in context of the ion and electron velocity data provided by the EISCAT...
EISCAT observations of plasma patches at sub-auroral cusp latitudes (2008)
Moen, J., Carlson, H. C., Oksavik, K., Nielsen, C. P., Pryse, S. E., Middleton, H. R., ...
A sequence of 3 patches of high-density (1012 m?3) cold plasma on a horizontal scale-size of 300?700 km was observed near magnetic noon by the EISCAT VHF radar above Svalbard on 17 December 2001. The...
Senior, A., Kosch, M. J., Yeoman, T. K., Rietveld, M. T., Mccrea, I. W.
Observations of HF radar backscatter from artificial field-aligned irregularities in an ionosphere perturbed by travelling disturbances due to atmospheric gravity waves are presented. Some features...
Reconfiguration of polar-cap plasma in the magnetic midnight sector (2008)
Pryse, S. E., Wood, A. G., Middleton, H. R., Mccrea, I. W., Lester, M.
Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the...
Lockwood, M., Davies, J. A., Moen, J., Van Eyken, A. P., Oksavik, K., Mccrea, I. W., ...
Using data from the EISCAT (European Incoherent Scatter) VHF and CUTLASS (Co-operative UK Twin-Located Auroral Sounding System) HF radars, we study the formation of ionospheric polar cap patches and...
Lockwood, M., Moen, J., Van Eyken, A. P., Davies, J. A., Oksavik, K., Mccrea, I. W.
Using data from the EISCAT (European Incoherent Scatter) VHF radar and DMSP (Defense Meteorological Satellite Program) spacecraft passes, we study the motion of the dayside open-closed field line...
Robinson, T. R., Yeoman, T. K., Dhillon, R. S., Lester, M., Thomas, E. C., Thornhill, J. D., ...
Results are presented from the first two active experimental campaigns undertaken by the new SPEAR (Space Plasma Exploration by Active Radar) high-power system that has recently become operational on...
The variation of parameters in time series data from the EISCAT UHF incoherent scatter radar has been used to estimate the uncertainties in measurements of electron concentration, electron and ion...
Imaging riometer observations of drifting absorption patches in the morning sector (2008)
Makarevitch, R. A., Honary, F., Mccrea, I. W., Howells, V. S. C.
Observations by a 7x7-beam imaging riometer in Kilpisjärvi, Finland (~66° MLAT) of the drifting cosmic noise absorption (CNA) structures in the morning sector near the zonal drift reversals are...
Moen, J., Lockwood, M., Oksavik, K., Carlson, H. C., Denig, W. F., Van Eyken, A. P., ...
A continuous band of high ion temperature, which persisted for about 8h and zigzagged north-south across more than five degrees in latitude in the dayside (07:00-15:00MLT) auroral ionosphere, was...
On solar protons and polar cap absorption: constraints on an empirical relationship (2008)
Kavanagh, A. J., Marple, S. R., Honary, F., Mccrea, I. W., Senior, A.
A large database of Solar Proton Events (SPE) from the period 1995 to 2001 is used to investigate the relationship between proton flux at geostationary orbit and Cosmic Noise Absorption (CNA) in the...
The statistical dependence of auroral absorption on geomagnetic and solar wind parameters (2008)
Kavanagh, A. J., Kosch, M. J., Honary, F., Senior, A., Marple, S. R., Woodfield, E. E., ...
Data from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland, have been compiled to form statistics of auroral absorption based on seven years of observations. In a previous...
Kavanagh, A. J., Honary, F., Mccrea, I. W., Donovan, E., Woodfield, E. E., Manninen, J., ...
A period (08:10?14:40 MLT, 11 February 1997) of enhanced electron density in the D- and E-regions is investigated using EISCAT, IRIS and other complementary instruments. The precipitation is...
Automated detection of satellite contamination in incoherent scatter radar spectra (2008)
Porteous, J., Samson, A. M., Berrington, K. A., Mccrea, I. W.
Anomalous ion line spectra have been identified in many experiments. Such spectra are defined as deviations from the standard symmetric "double-humped" spectra derived from incoherent scatter radar...
Pryse, S. E., Smith, A. M., Kersley, L., Mccrea, I. W.
Observations by the EISCAT Svalbard radar are presented that show the response of the spatial structure of the ionosphere in the dayside cusp region to a rotational trend in the IMF clock angle. Over...
Solar and seasonal dependence of ion frictional heating (2008)
Davies, J. A., Lester, M., Mccrea, I. W.
Ion frictional heating constitutes one of the principal mechanisms whereby energy, originating in the solar wind, is deposited into the Earth's ionosphere and ultimately the neutral atmosphere....
A statistical study of ion frictional heating observed by EISCAT (2008)
Davies, J. A., Lester, M., Mccrea, I. W.
Results of a statistical survey of F-region ion frictional heating are presented, a survey which is based on over 4000 h of common programme observations taken by the European incoherent scatter...
Mitchell, C. N., Walker, I. K., Pryse, S. E., Kersley, I., Mccrea, I. W., Jones, T. B.
Experimental results are presented from ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar. Tomographic measurements on 10 October 1996, showing a narrow, field-aligned...
New techniques for auroral irregularity studies with COSCAT (2008)
Eglitis, P., Mccrea, I. W., Robinson, T. R., Nygrén, T., Schlegel, K., Turunen, T., ...
The COSCAT system enables the detection of E-region auroral backscatter with the EISCAT remote receivers at magnetic aspect angles close to 90 °. This is achieved by utilising a low-power...
Errors due to random noise in velocity measurement using incoherent-scatter radar (2008)
Williams, P. J. S., Etemadi, A., Mccrea, I. W., Todd, H.
The random-noise errors involved in measuring the Doppler shift of an 'incoherent-scatter' spectrum are predicted theoretically for all values of Te/Ti from 1.0 to 3.0. After correction has been made...
A first comparison of irregularity and ion drift velocity measurements in the E-region (2008)
Makarevich, R. A., Honary, F., Howells, V. S. C., Koustov, A. V., Milan, S. E., Davies, J. A., ...
E-region irregularity velocity measurements at large flow angles with the STARE Finland coherent VHF radar are considered in context of the ion and electron velocity data provided by the EISCAT...
EISCAT observations of plasma patches at sub-auroral cusp latitudes (2008)
Moen, J., Carlson, H. C., Oksavik, K., Nielsen, C. P., Pryse, S. E., Middleton, H. R., ...
A sequence of 3 patches of high-density (1012 m?3) cold plasma on a horizontal scale-size of 300?700 km was observed near magnetic noon by the EISCAT VHF radar above Svalbard on 17 December 2001. The...
Senior, A., Kosch, M. J., Yeoman, T. K., Rietveld, M. T., Mccrea, I. W.
Observations of HF radar backscatter from artificial field-aligned irregularities in an ionosphere perturbed by travelling disturbances due to atmospheric gravity waves are presented. Some features...
Reconfiguration of polar-cap plasma in the magnetic midnight sector (2008)
Pryse, S. E., Wood, A. G., Middleton, H. R., Mccrea, I. W., Lester, M.
Radio tomography and the EISCAT and SuperDARN radars have been used to identify long-lived, high-altitude, cold plasma in the antisunward convective flow across the polar cap. The projection of the...
Lockwood, M., Davies, J. A., Moen, J., Van Eyken, A. P., Oksavik, K., Mccrea, I. W., ...
Using data from the EISCAT (European Incoherent Scatter) VHF and CUTLASS (Co-operative UK Twin-Located Auroral Sounding System) HF radars, we study the formation of ionospheric polar cap patches and...
Lockwood, M., Moen, J., Van Eyken, A. P., Davies, J. A., Oksavik, K., Mccrea, I. W.
Using data from the EISCAT (European Incoherent Scatter) VHF radar and DMSP (Defense Meteorological Satellite Program) spacecraft passes, we study the motion of the dayside open-closed field line...
Robinson, T. R., Yeoman, T. K., Dhillon, R. S., Lester, M., Thomas, E. C., Thornhill, J. D., ...
Results are presented from the first two active experimental campaigns undertaken by the new SPEAR (Space Plasma Exploration by Active Radar) high-power system that has recently become operational on...
The variation of parameters in time series data from the EISCAT UHF incoherent scatter radar has been used to estimate the uncertainties in measurements of electron concentration, electron and ion...
Imaging riometer observations of drifting absorption patches in the morning sector (2008)
Makarevitch, R. A., Honary, F., Mccrea, I. W., Howells, V. S. C.
Observations by a 7x7-beam imaging riometer in Kilpisjärvi, Finland (~66° MLAT) of the drifting cosmic noise absorption (CNA) structures in the morning sector near the zonal drift reversals are...
Moen, J., Lockwood, M., Oksavik, K., Carlson, H. C., Denig, W. F., Van Eyken, A. P., ...
A continuous band of high ion temperature, which persisted for about 8h and zigzagged north-south across more than five degrees in latitude in the dayside (07:00-15:00MLT) auroral ionosphere, was...
On solar protons and polar cap absorption: constraints on an empirical relationship (2008)
Kavanagh, A. J., Marple, S. R., Honary, F., Mccrea, I. W., Senior, A.
A large database of Solar Proton Events (SPE) from the period 1995 to 2001 is used to investigate the relationship between proton flux at geostationary orbit and Cosmic Noise Absorption (CNA) in the...
The statistical dependence of auroral absorption on geomagnetic and solar wind parameters (2008)
Kavanagh, A. J., Kosch, M. J., Honary, F., Senior, A., Marple, S. R., Woodfield, E. E., ...
Data from the Imaging Riometer for Ionospheric Studies (IRIS) at Kilpisjärvi, Finland, have been compiled to form statistics of auroral absorption based on seven years of observations. In a previous...
Kavanagh, A. J., Honary, F., Mccrea, I. W., Donovan, E., Woodfield, E. E., Manninen, J., ...
A period (08:10?14:40 MLT, 11 February 1997) of enhanced electron density in the D- and E-regions is investigated using EISCAT, IRIS and other complementary instruments. The precipitation is...
Automated detection of satellite contamination in incoherent scatter radar spectra (2008)
Porteous, J., Samson, A. M., Berrington, K. A., Mccrea, I. W.
Anomalous ion line spectra have been identified in many experiments. Such spectra are defined as deviations from the standard symmetric "double-humped" spectra derived from incoherent scatter radar...
Pryse, S. E., Smith, A. M., Kersley, L., Mccrea, I. W.
Observations by the EISCAT Svalbard radar are presented that show the response of the spatial structure of the ionosphere in the dayside cusp region to a rotational trend in the IMF clock angle. Over...
Solar and seasonal dependence of ion frictional heating (2008)
Davies, J. A., Lester, M., Mccrea, I. W.
Ion frictional heating constitutes one of the principal mechanisms whereby energy, originating in the solar wind, is deposited into the Earth's ionosphere and ultimately the neutral atmosphere....
A statistical study of ion frictional heating observed by EISCAT (2008)
Davies, J. A., Lester, M., Mccrea, I. W.
Results of a statistical survey of F-region ion frictional heating are presented, a survey which is based on over 4000 h of common programme observations taken by the European incoherent scatter...
Mitchell, C. N., Walker, I. K., Pryse, S. E., Kersley, I., Mccrea, I. W., Jones, T. B.
Experimental results are presented from ionospheric tomography, the EISCAT Svalbard radar and the CUTLASS HF radar. Tomographic measurements on 10 October 1996, showing a narrow, field-aligned...
New techniques for auroral irregularity studies with COSCAT (2008)
Eglitis, P., Mccrea, I. W., Robinson, T. R., Nygrén, T., Schlegel, K., Turunen, T., ...
The COSCAT system enables the detection of E-region auroral backscatter with the EISCAT remote receivers at magnetic aspect angles close to 90 °. This is achieved by utilising a low-power...
Errors due to random noise in velocity measurement using incoherent-scatter radar (2008)
Williams, P. J. S., Etemadi, A., Mccrea, I. W., Todd, H.
The random-noise errors involved in measuring the Doppler shift of an 'incoherent-scatter' spectrum are predicted theoretically for all values of Te/Ti from 1.0 to 3.0. After correction has been made...
A First Comparison of Irregularity and Ion Drift Velocity Measurements in the E-region. (2006)
Makarevich, R. A., Honary, F., Howells, V. S. C., Koustov, A. V., Milan, S. E., Davies, J. A., ...
Imaging Riometer Observations of Drifting Absorption Patches in the Morning Sector (2004)
Makarevitch, R. A., Honary, F., McCrea, I. W., Howells, V. S. C.
Novel Artificial Optical Annular Structures in the High Latitude Ionosphere over EISCAT (2004)
Kosch, M. J., Rietveld, M. T., Senior, A., McCrea, I. W., Kavanagh, A. J., Isham, B., ...
The EISCAT low-gain HF facility has been used repeatedly to produce artificially stimulated optical emissions in the F-layer ionosphere over northern Scandinavia. On 12 November 2001, the high-gain...
On Solar Protons and Polar Cap Absorption: Constraints on an Empirical Relationship. (2004)
Kavanagh, A. J., Marple, S. R., Honary, F., McCrea, I. W., Senior, A.
The Statistical Dependence of Auroral Absorption on Geomagnetic and Solar Wind Parameters (2004)
Kavanagh, A. J., Kosch, M. J., Honary, F., Senior, A., Marple, S. R., Woodfield, E. E., ...
High-latitude Artificial Aurora Using the EISCAT High-gain HF Facility (2002)
Kosch, M. J., Rietveld, M. T., Kavanagh, A. J., Jussila, J., Isham, B., Kaila, K., ...
The EISCAT high-frequency (HF) transmitter facility at Ramfjord, Norway, has been used to accelerate F-region electrons sufficiently to excite the oxygen atoms and nitrogen molecules, resulting in...