Search Results - "Parkinson, M. L."

Complexity in the scaling of velocity fluctuations in the high-latitude F-region ionosphere by PARKINSON, M. L

“…The temporal scaling properties of F-region velocity fluctuations, δvlos, were characterised over 17 octaves of temporal scale from τ=1 s to <1 day using a new…”
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Dynamical critical scaling of electric field fluctuations in the greater cusp and magnetotail implied by HF radar observations of F-region Doppler velocity by PARKINSON, M. L

“…Akasofu's solar wind ε parameter describes the coupling of solar wind energy to the magnetosphere and ionosphere. Analysis of fluctuations in ε using model…”
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On the temporal evolution of midlatitude F region disturbance drifts by Kumar, V. V., Parkinson, M. L., Dyson, P. L.

“…Superposed Epoch Analysis (SEA) is used to examine a 5‐year (1999 to 2003) database of Digisonde drift measurements made at Bundoora (145.1°E, 37.7°S…”
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The effects of thunderstorm-generated atmospheric gravity waves on mid-latitude F-region drifts by Kumar, V.V., Parkinson, M.L., Dyson, P.L., Burns, G.B.

“…Superposed epoch analysis (SEA) was used to examine ionospheric drift velocities measured by a digital ionosonde located at the mid-latitude station Bundoora…”
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Studies of medium scale travelling ionospheric disturbances using TIGER SuperDARN radar sea echo observations by HE, L.-S, DYSON, P. L, PARKINSON, M. L, WAN, W

“…Seasonal and diurnal variations in the direction of propagation of medium-scale travelling ionospheric disturbances (MSTIDs) have been investigated by…”
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Solar and geomagnetic activity effects on mid-latitude F-region electric fields by KUMAR, V. V, PARKINSON, M. L, DYSON, P. L, POLGLASE, R

“…Diurnal patterns of average F-region ionospheric drift (electric field) and their dependence on solar and geomagnetic activity have been defined using digital…”
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Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams by PARKINSON, M. L, PINNOCK, M, WILD, J. A, LESTER, M, YEOMAN, T. K, MILAN, S. E, YE, H, DEVLIN, J. C, FREY, H. U, KIKUCHI, T

“…Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L4), the energetic ions drift…”
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Complexity in the high latitude HF radar spectral width boundary region by PARKINSON, M. L, HANNAH, K. M, DYSON, P. L

“…SuperDARN radars are sensitive to the collective Doppler characteristics of decametre-scale irregularities in the high latitude ionosphere. The radars…”
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Towards a synthesis of substorm electrodynamics : HF radar and auroral observations by GROCOTT, A, LESTER, M, PARKINSON, M. L, YEOMAN, T. K, DYSON, P. L, DEVLIN, J. C, FREY, H. U

“…At 08:35 UT on 21 November 2004, the onset of an interval of substorm activity was captured in the southern hemisphere by the Far UltraViolet (FUV) instrument…”
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Solar cycle changes in the geo-effectiveness of small-scale solar wind turbulence measured by Wind and ACE at 1 AU by PARKINSON, M. L, HEALEY, R. C, DYSON, P. L

“…Multi-scale structure of the solar wind in the ecliptic at 1 AU undergoes significant evolution with the phase of the solar cycle. Wind spacecraft measurements…”
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Thunderstorm-associated responses in the vertical motion of the mid-latitude F-region ionosphere by Kumar, V.V., Parkinson, M.L., Dyson, P.L., Burns, G.B.

“…Mid-latitude Digisonde Doppler velocities, auroral electrojet (AE) indices and cloud-to-ground (CG) lightning strokes during August 2003–2004 were used to…”
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On the lifetime and extent of an auroral westward flow channel (AWFC) observed during a magnetospheric substorm by PARKINSON, M. L, PINNOCK, M, YE, H, HAIRSTON, M. R, DEVLIN, J. C, DYSON, P. L, MORRIS, R. J, PONOMARENKO, P

“…A -190-nT negative bay in the geomagnetic X component measured at Macquarie Island ( -65° L) showed that an ionospheric substorm occurred during 09:58 to 11:10…”
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Magnetic local time, substorm, and particle precipitation-related variations in the behaviour of SuperDARN doppler spectral widths by PARKINSON, M. L, CHISHAM, G, PINNOCK, M, DYSON, P. L, DEVLIN, J. C

“…Super Dual Auroral Radar Network (DARN) radars often detect a distinct transition in line-of-sight Doppler velocity spread, or spectral width, from <50ms–1 at…”
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On the occurrence and motion of decametre-scale irregularities in the sub-auroral, auroral, and polar cap ionosphere by PARKINSON, M. L, DEVLIN, J. C, YE, H, WATERS, C. L, DYSON, P. L, BREED, A. M, MORRIS, R. J

“…The statistical occurrence of decametre-scale ionospheric irregularities, average line-of-sight (LOS) Doppler velocity, and Doppler spectral width in the…”
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An auroral westward flow channel (AWFC) and its relationship to field-aligned current, ring current, and plasmapause location determined using multiple spacecraft observations by PARKINSON, M. L, WILD, J. A, WATERS, C. L, LESTER, M, LUCEK, E. A, DECREAU, P. M. E

“…An auroral westward flow channel (AWFC) is a latitudinally narrow channel of unstable F-region plasma with intense westward drift in the dusk-to-midnight…”
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Behavior of the ionosphere and thermosphere at a southern midlatitude station during magnetic storms in early March 1995 by Richards, P. G., Dyson, P. L., Davies, T. P., Parkinson, M. L., Reeves, A. J.

“…During the first six days of March 1995, measurements of the ionospheric electron density were made near Melbourne, Australia, with a digisonde and…”
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Thermospheric neutral winds at southern mid-latitudes: A comparison of optical and ionosonde hmF2 methods by Dyson, P. L., Davies, T. P., Parkinson, M. L., Reeves, A. J., Richards, P. G., Fairchild, C. E.

“…During the first 6 days of March 1995, measurements of the ionospheric electron density were made with a digisonde, and thermospheric winds were measured with…”
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Signatures of the midnight open-closed magnetic field line boundary during balanced dayside and nightside reconnection by PARKINSON, M. L, DYSON, P. L, PINNOCK, M, DEVLIN, J. C, HAIRSTON, M. R, YIZENGAW, E, WILKINSON, P. J

“…The geomagnetic conditions were moderately disturbed (Kp = 2) during magnetic midnight on 10 December 1999, when the Tasman International Geospace Environment…”
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Seasonal and magnetic activity variations of ionospheric electric fields above the southern mid-latitude station, Bundoora, Australia by PARKINSON, M. L, POLGLASE, R, FEJER, B. G, SCHERLIESS, L, DYSON, P. L, UJMAIA, S. M

“…We investigate the seasonal, local solar time, and geomagnetic activity variations of the average Doppler velocity measured by an HF digital ionosonde deployed…”
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Variations in the spectral index of the galactic radio continuum emission in the northern hemisphere by Lawson, K. D., Mayer, C. J., Osborne, J. L., Parkinson, M. L.

“…A study is made of the radio continuum emission of the Galaxy in the North Celestial Hemisphere. The variation of spectral index over a range of frequencies…”
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