Observations Of Temperature Gradient Instabilities In The Plasmapause Region Using The SuperDARN HF Wallops Radar And Millstone Hill CEDAR 2007 P. J. Erickson,

Slides:

Advertisements

Similar presentations

SuperDARN is a network of HF radars (8-20 MHz) used to study the convection in the Earth's ionosphere at altitudes between 90 and 400 km and at magnetic.

Advertisements

“Rates of occurrence of TIGER HF radar echo parameters sorted according to the K p index and the IMF - early results” M. L. Parkinson 1, J. C. Devlin 2,

Yun Zou and Nozomu Nishitani （ STEL, Nagoya University ） Yun Zou and Nozomu Nishitani （ STEL, Nagoya University ） Study of mid-latitude ionospheric convection.

Virginia Tech1 Overview of Changes and Developments in the SuperDARN Upper Atmosphere Facility Raymond A. Greenwald, J. Michael Ruohoniemi, Joseph.

Using a DPS as a Coherent Scatter HF Radar Lindsay Magnus Lee-Anne McKinnell Hermanus Magnetic Observatory Hermanus, South Africa.

J C Foster MIT Haystack Observatory Yosemite 2002 Plasma Tails & Ionospheric SED.

Extended observations of decameter scatter associated with the mid-latitude ionospheric trough E. R. Talaat 1, E. S. Miller 1, R. J. Barnes 1, J. M. Ruohoniemi.

PHYSICS AND ENGINEERING PHYSICS Mohsen Ghezelbash, H. Liu, A.V. Koustov and D. André F-region echo occurrence in the polar cap: A comparison of PolarDARN.

The North East CIDR Array (NECA): A Chain of Ionospheric Tomography Receivers for Studying the Equatorward Edge of the Auroral Oval and the Mid-latitude.

Auroral dynamics EISCAT Svalbard Radar: field-aligned beam  complicated spatial structure (

AJ Ribeiro Irregs.Short Meeting Title, Date A survey of plasma irregularities seen by the mid-latitude Blackstone SuperDARN radar.

Phase Coherence on Open Field Lines Associated with FLRs Abiyu Nedie, Frances Fenrich & Robert Rankin University of Alberta Edmonton, Alberta, Canada 2011.

1 Sounding rocket measurements of decameter structures in the cusp K. Oksavik 1, J. Moen 1,2, D. A. Lorentzen 1, F. Sigernes 1, T. Abe 3, Y. Saito 3, and.

HF Focusing due to Field Aligned Density Perturbations A. Vartanyan 1, G. M. Milikh 1, K. Papadopoulos 1, M. Parrot 2 1 Departments of Physics and Astronomy,

SuperDARN and reversed flow events in the cusp

SCHOOL OF PHYSICS Space Weather in the Equatorial Ionosphere Robert Stening School of Physics, University of New South Wales Acknowledge help from Dr J.

Comparative Aeronomy at Earth and Mars Paul Withers Boston University In collaboration with Michael Mendillo and BU colleagues, David.

Magnetospheric Morphology Prepared by Prajwal Kulkarni and Naoshin Haque Stanford University, Stanford, CA IHY Workshop on Advancing VLF through the Global.

Radar Remote Sensing Laboratory University of Washington Melissa Meyer, Andrew Morabito, Zac Berkowitz, John Sahr University of Washington Electrical Engineering.

On the importance of IMF |B Y | on polar cap patch formation Qinghe Zhang 1, Beichen Zhang 1, Ruiyuan Liu 1, M. W. Dunlop 2, M. Lockwood 2, 3, J. Moen.

SuperDARN real time products for Space Weather Ermanno Amata INAF Istituto di Fisica dello Spazio Interplanetario Roma ESWW5, Bruxelles, 20 November 2008.

V. M. Sorokin, V.M. Chmyrev, A. K. Yaschenko and M. Hayakawa Strong DC electric field formation in the ionosphere over typhoon and earthquake regions V.

Geospace Variability through the Solar Cycle John Foster MIT Haystack Observatory.

Review Doppler Radar (Fig. 3.1) A simplified block diagram 10/29-11/11/2013METR

the Ionosphere as a Plasma

The TIDDBIT HF Doppler Radar G. Crowley and F. Rodrigues

Formation of Artificial Ionospheric Ducts Gennady Milikh, Dennis Papadopoulos University of Maryland, Joe Huba, Glenn Joyce Joe Huba, Glenn Joyce Naval.

Incoherent Scattering

CLIMATE CHANGE INDICATORS: UPPER ATMOSPHERE.  Global Temperatures  GHG emissions  Heat waves  Drought  Precipitation  Flooding  Cyclones  Sea.

EISCAT Svalbard Radar studies of meso-scale plasma flow channels in the polar cusp ionosphere Y. Dåbakk et al.

Large electric fields near the nightside plasmapause observed by the Polar spacecraft K.-H. Kim 1, F. Mozer 2, and D.-H. Lee 1 1 Department of Astronomy.

Distributed Radar Networks Ray Greenwald JHU/APL.

T. Ogawa 1, T. Adachi 2, and N. Nishitani 3 1) NICT, Japan 2) Stanford Univ., USA 3) STE Lab., Nagoya Univ., Japan Medium-Scale Traveling Ionospheric Disturbances.

The Linear and Non-linear Evolution Mechanism of Mesoscale Vortex Disturbances in Winter Over Western Japan Sea Yasumitsu MAEJIMA and Keita IGA (Ocean.

Ionospheric Research at USU R.W. Schunk, L. Scherliess, J.J. Sojka, D.C. Thompson & L. Zhu Center for Atmospheric & Space Sciences Utah State University.

Nonlinear Optics in Plasmas. What is relativistic self-guiding? Ponderomotive self-channeling resulting from expulsion of electrons on axis Relativistic.

Ionospheric Current and Aurora CSI 662 / ASTR 769 Lect. 12 Spring 2007 April 24, 2007 References: Prolss: Chap , P (main) Tascione: Chap.

HT-7 ASIPP The Influence of Neutral Particles on Edge Turbulence and Confinement in the HT-7 Tokamak Mei Song, B. N. Wan, G. S. Xu, B. L. Ling, C. F. Li.

University of Saskatchewan PHYSICS AND ENGINEERING PHYSICS Spectral widths of F-region PolarDARN echoes, a statistical assessment A.V. Koustov, S. Toderian.

CEDAR 2008 Workshop Observations at the Plasmaspheric Boundary Layer with the Mid-latitude SuperDARN radars Mike Ruohoniemi, Ray Greenwald, and Jo Baker.

Review Doppler Radar (Fig. 3.1) A simplified block diagram 10/29-11/11/2013METR

Comparison of the electron density profiles measured with the Incoherent Scatter Radar, Digisonde DPS-4 and Chirp-Ionosonde Ratovsky K.G., Shpynev* B.G.,

All-sky camera of the ALFA project: common points and interests with the Wide Field Astronomical Observations E. Séran & M. Godefroy CETP, St-Maur June.

Ionospheric HF radars Pasha Ponomarenko. Outline Conventional radars vs ionospheric radars Collective scatter processes Aspect angle effects HF propagation.

HAARP-induced Ionospheric Ducts Gennady Milikh, University of Maryland in collaboration with: Dennis Papadopoulos, Chia-Lee Chang, BAE systems Evgeny Mishin,

Overview of Results from the Radio Plasma Imager (RPI) on IMAGE James L. Green Space Science Data Operations Office Goddard Space Flight Center LEP Seminar.

Integrity  Service  Excellence Physics of the Geospace Response to Powerful HF Radio Waves HAARP-Resonance Workshop, 8-9 November 2011 Evgeny Mishin.

WG3 “Ionospheric Storms” Summary Report

Ionospheric Science, Models and Databases at Haystack Observatory

New Science Opportunities with a Mid-Latitude SuperDARN Radar Raymond A. Greenwald Johns Hopkins University Applied Physics Laboratory.

Mike Ruohoniemi 2012VT SuperDARN Remote Sensing of the Ionosphere and Earth’s Surface with HF Radar J. Michael Ruohoniemi and Joseph Baker.

Characteristics and source of the electron density irregularities in the Earth’s ionosphere Hyosub Kil Johns Hopkins University / Applied Physics Laboratory.

Effects of January 2010 stratospheric sudden warming in the low-latitude ionosphere L. Goncharenko, A. Coster, W. Rideout, MIT Haystack Observatory, USA.

Statistical Characterization of sub-auroral polarization stream using using large scale observations by mid- latitude SuperDARN radars B. S. R. Kunduri.

Postmidnight ionospheric trough in summer and link to solar wind: how, when and why? Mirela Voiculescu (1), T. Nygrén (2), A. Aikio(2), H. Vanhamäki (2)

By Saneeju m salu. Radio waves are one form of electromagnetic radiation RADIO WAVES.

Radiation Belt Storm Probes Mission and the Ionosphere-Thermosphere RPSP SWG Meeting June 2009.

VT SuperDARN Group Joseph Baker Ground-Based Observations of the Plasmapause Boundary Layer (PBL) Region with.

Impact of midnight thermosphere dynamics on the equatorial ionospheric vertical drifts Tzu-Wei Fang 1,2 R. Akmaev 2, R. Stoneback 3, T. Fuller-Rowell 1,2,

Recent progress in our understanding of E region irregularities

pre-reversal enhancement of the evening vertical plasma drifts

Ionospheric Science and Space Weather

Space weather challenges of the polar cap ionosphere

Evidence for Dayside Interhemispheric Field-Aligned Currents During Strong IMF By Conditions Seen by SuperDARN Radars Joseph B.H. Baker, Bharat Kunduri.

Ionospheric fluctuations structure during strong geomagnetic storm by incoherent scatter radar and GPS data Yu.V. CHERNIAK(1), I.I. SHAGIMURATOV(1), A.

CEDAR 2013 Workshop International space weather and climate observations along the 120E/60W meridional circle and its surrounding areas Space weather observations.

Incoherent versus coherent scatter radars (ISR’s vs CSR’s)

Penetration Jet DMSP F April MLT

On Strong Coupling between the Harang Reversal Evolution and Substorm Dynamics: A Synthesis of SuperDARN, DMSP and IMAGE Observations Shasha Zou1, Larry.

Three Regions of Auroral Acceleration

Presentation transcript:

Observations Of Temperature Gradient Instabilities In The Plasmapause Region Using The SuperDARN HF Wallops Radar And Millstone Hill CEDAR 2007 P. J. Erickson, F. D. Lind P. J. Erickson, F. D. Lind Atmospheric Sciences Group Atmospheric Sciences Group MIT Haystack Observatory MIT Haystack Observatory R. A. Greenwald, K. Oksavik Johns Hopkins University / APL R. A. Greenwald, K. Oksavik Johns Hopkins University / APL

Example of an Instability Process F-region gradient-drift instability High Density Low Density High Density Low Density  B0B0 E0E0 V 0 = (E 0 xB 0 )/ B E1E1 E1E1 E1E

The Phenomena: Persistent Low-Velocity Wallops Echoes Very frequent (e.g. Feb 2006: 19 out of 27 observation days) Long duration (7+ hours per night) Low Doppler shift (30-90 m/s) Very small spectral width Low activity (Kp 0-2) Sub-auroral region (54-60 inv lat) Cause?

Examples of Ionospheric Scatter From Plasmasphere Boundary Layer Jan 21, 2006 Beam 4 Jan 22, 2006 Beam 4 Jan 23, 2006 Beam 4 Sept 11, 2005 Beam 1

Potential Mechanism: Temperature Gradient Instability Growth in regions of strong density and temperature gradients Temperature gradient drives drift into density gradient Seen in the vicinity of SAR arcs at L=3.2 Originally observed with OGO-6, OV1-17 electric field detectors at > 400 km May seed other instabilities (Gradient drift) responsible for HF backscatter Hudson and Kelley (1976) Te Ne

Millstone/Wallops Experiment to Identify Source of Subauroral Irregularities MHO: 34 az, (18/28/48 el) + zenith focused on km Wallops: 16 beam Doppler velocity scan. Millstone Hill is along beam indicated by the arrow.

Te Zenith 54 inv Te 48 el 55.5 inv Te 28 el 57.0 inv Te 18 el 58.2 inv Log(Ne) Zenith 54 inv Log(Ne) 48 el 55.5 inv Log(Ne) 28 el 57.0 inv Log(Ne) 18 el 58.2 inv Millstone Hill Plasma Parameters In F Region: 2300 – 0430 UTC

SuperDARN Wallops HF Backscatter + MHO Gradients 2200 – 0500 UTC – 2340: Ground refracted scatter 2340 – 0140: GDI or trough wall or zonal gradient (seen before). TGI not active yet onwards: TGI conditions present as Te gradient changes sign. Scatter weakens at higher beams as density decreases. TX frequency adjusted at 0410 UT – enhances scatter (refraction change)

Temperature Gradient Cause: Trapped Electrons + Postsunset Cooling (NOAA-17)

Gradient Drift Is Not Primary Mechanism: Millstone Plasma Velocities Agree with Wallops Irregularity Doppler Speeds (* = Millstone Hill, red line = Wallops)

Summary Low Doppler irregularities frequently observed near plasmapause by SD Wallops Joint ISR – SD experiment identifies temperature gradient instability as primary driver (although GDI may contribute through cascade) Postsunset low latitude cooling and high latitude trapped electron heating contribute to formation of temperature gradient Possible Wallops monitor of plasmapause boundary?