Presentation is loading. Please wait.

Presentation is loading. Please wait.

Finding the Source of Ion Beams in the Solar Wind Hanna Kristensen Advisors: Justin Kasper and Mike Stevens.

Published byRaymond Goodman Modified over 8 years ago

Similar presentations

Presentation on theme: "Finding the Source of Ion Beams in the Solar Wind Hanna Kristensen Advisors: Justin Kasper and Mike Stevens."— Presentation transcript:

1 Finding the Source of Ion Beams in the Solar Wind Hanna Kristensen Advisors: Justin Kasper and Mike Stevens

2 Solar Wind Plasma frozen into magnetic field lines (by the Lorentz Force) The proton density, velocity, temperature vary – n~ a few cm -3 – v~ hundreds of km/s – w~ tens of km/s Usually not in thermodynamic equilibrium!

3 Maxwell distribution

4

5 Magnetic Reconnection

6 Reconnection Sites Gosling et al., 2005

7 Wind Faraday Cup Sitting at the first LaGrange point Spinning at 3 second period 2 Faraday cups (one tilted up and one down) SWE

8

9 Data Collection

10 March 25, 1998 15:45 16:00 16:15 16:30 16:45 B y [nT] B z [nT] B x [nT] v y [km/s] v z [km/s] v x [km/s] (red points signify a beam detected)

11 Density in the exhaust

12 Transformation Out-of-plane speed [km/s] Inflow speed [km/s] Outflow speed [km/s]

13 Fits Ion Flux Distribution for March 25, 1998; 16:21

14 YearDayAlfvén Speed (km/s) Differential Speed ΔV (km/s) Inflow Speed (km/s) 199523320.445138.17008.3030 34.455425.590010.4023 199732787.210969.169128.2312 36447.389536.794321.5697 199808419.500538.050020.1990 31837.130535.823532.2102 200027780.893129.610628.3373 200124418.593446.55088.7546 200204946.028621.865219.7115 200311940.715056.965715.6045 200609050.006733.60169.0000 200707033.00009.87347.3527

15 Relationship between inflow speed and Δv

16 Differential flow vs. Alfvén speed

17 Plasma Instabilities

18 Instability Evolution Configurations with ∆v››v A are unstable! Beam loses energy to Alfvénic fluctuations Waves become stronger Waves scramble the structure Growth rate is faster than the time it takes plasma to cross the exhaust Yoshiharu Omura and Koichi Shin Research Institute for Sustainable Humanosphere, Kyoto University

19 Conclusions Beams do develop in magnetic reconnection exhausts Their speed actually exceeds the inflow speed – Acceleration process? In some cases, an unstable beam-core configuration arises (Alfvén/Ion cyclotron mode)

20 Acknowledgements Dr. Michael Stevens and Dr. Justin Kasper NSF (grant number AGS-1263241) CFA Dr. Kathy Reeves and Dr. Trae Winter SSXG & Admins Fellow astronomy and solar interns

21 Questions What is the process that accelerates the beams faster than the inflow? How does the instability affect the evolution of reconnection exhausts

22 Much of the solar wind has Alfvénic beams of coronal origin This is the stuff we think reconnection might explain We actually found this stuff in some reconnection exhausts

Download ppt "Finding the Source of Ion Beams in the Solar Wind Hanna Kristensen Advisors: Justin Kasper and Mike Stevens."

Similar presentations

Multiple reconnections and explosive events and in MST and solar flares Gennady Fiksel CMSO workshop, Princeton, NJ, Oct 5-8, 2005.

Multiple reconnections and explosive events and in MST and solar flares Gennady Fiksel CMSO workshop, Princeton, NJ, Oct 5-8, 2005.
Anomalous Ion Heating Status and Research Plan

Anomalous Ion Heating Status and Research Plan
The Johns Hopkins University Applied Physics Laboratory SHINE 2005, July 11-15, 2005 Transient Shocks and Associated Energetic Particle Events Observed.

The Johns Hopkins University Applied Physics Laboratory SHINE 2005, July 11-15, 2005 Transient Shocks and Associated Energetic Particle Events Observed.
Session A Wrap Up. He Abundance J. Kasper Helium abundance variation over the solar cycle, latitude and with solar wind speed Slow solar wind appears.

Session A Wrap Up. He Abundance J. Kasper Helium abundance variation over the solar cycle, latitude and with solar wind speed Slow solar wind appears.
Momentum Transport During Reconnection Events in the MST Reversed Field Pinch Alexey Kuritsyn In collaboration with A.F. Almagri, D.L. Brower, W.X. Ding,

Momentum Transport During Reconnection Events in the MST Reversed Field Pinch Alexey Kuritsyn In collaboration with A.F. Almagri, D.L. Brower, W.X. Ding,
Ion Pickup One of the fundamental processes in space plasma physics.

Ion Pickup One of the fundamental processes in space plasma physics.
1 Diagnostics of Solar Wind Processes Using the Total Perpendicular Pressure Lan Jian, C. T. Russell, and J. T. Gosling How does the magnetic structure.

1 Diagnostics of Solar Wind Processes Using the Total Perpendicular Pressure Lan Jian, C. T. Russell, and J. T. Gosling How does the magnetic structure.
Temporal Separation of AIA 131 Å and GOES 1-8 Å Peak Flux in Solar Flares Daniel Herman Reed College ‘15 Advisors: Dr. Kathy Reeves & Dr. Trae Winter 8/14/2014.

Temporal Separation of AIA 131 Å and GOES 1-8 Å Peak Flux in Solar Flares Daniel Herman Reed College ‘15 Advisors: Dr. Kathy Reeves & Dr. Trae Winter 8/14/2014.
Alfvén-cyclotron wave mode structure: linear and nonlinear behavior J. A. Araneda 1, H. Astudillo 1, and E. Marsch 2 1 Departamento de Física, Universidad.

Alfvén-cyclotron wave mode structure: linear and nonlinear behavior J. A. Araneda 1, H. Astudillo 1, and E. Marsch 2 1 Departamento de Física, Universidad.
Five Spacecraft Observations of Oppositely Directed Exhaust Jets from a Magnetic Reconnection X-line Extending > 4.3 x 10 6 km in the Solar Wind Gosling.

Five Spacecraft Observations of Oppositely Directed Exhaust Jets from a Magnetic Reconnection X-line Extending > 4.3 x 10 6 km in the Solar Wind Gosling.
Modeling the Neupert Effect in Flares: Connecting Theory and Observation Andrea Egan Advisors: Dr. Trae Winter and Dr. Kathy Reeves.

Modeling the Neupert Effect in Flares: Connecting Theory and Observation Andrea Egan Advisors: Dr. Trae Winter and Dr. Kathy Reeves.
Further Study of Ion Pickup. Turbulent Alfven waves and magnetic field lines Turbulent waves represent enhanced random fluctuations. Fluctuations vitiate.

Further Study of Ion Pickup. Turbulent Alfven waves and magnetic field lines Turbulent waves represent enhanced random fluctuations. Fluctuations vitiate.
Solar Flare Particle Heating via low-beta Reconnection Dietmar Krauss-Varban & Brian T. Welsch Space Sciences Laboratory UC Berkeley Reconnection Workshop.

Solar Flare Particle Heating via low-beta Reconnection Dietmar Krauss-Varban & Brian T. Welsch Space Sciences Laboratory UC Berkeley Reconnection Workshop.
12 00 12 00 0 2 3 4 1 Prob, % WinterSummer Probability of observing downward field-aligned electron energy flux >10 mW/m 2 in winter and summer hemispheres.

Prob, % WinterSummer Probability of observing downward field-aligned electron energy flux >10 mW/m 2 in winter and summer hemispheres.
Carlson et al. ‘01 Three Characteristic Acceleration Regions.

Carlson et al. ‘01 Three Characteristic Acceleration Regions.
Magnetic Reconnection in the Solar Wind Gosling, Phan, et al.

Magnetic Reconnection in the Solar Wind Gosling, Phan, et al.
Evidence of Thick Reconnection Layers in Solar Flares John Raymond Work with A. Ciaravella, Y.-K. Ko and J. Lin White Light and UV Observations Apparent.

Evidence of Thick Reconnection Layers in Solar Flares John Raymond Work with A. Ciaravella, Y.-K. Ko and J. Lin White Light and UV Observations Apparent.
Winds of cool supergiant stars driven by Alfvén waves

Winds of cool supergiant stars driven by Alfvén waves
In-situ Observations of Collisionless Reconnection in the Magnetosphere Tai Phan (UC Berkeley) 1.Basic signatures of reconnection 2.Topics: a.Bursty (explosive)

In-situ Observations of Collisionless Reconnection in the Magnetosphere Tai Phan (UC Berkeley) 1.Basic signatures of reconnection 2.Topics: a.Bursty (explosive)
Progenitors to Geoeffective Coronal Mass Ejections: Filaments and Sigmoids David McKenzie, Robert Leamon Karen Wilson, Zhona Tang, Anthony Running Wolf.

Progenitors to Geoeffective Coronal Mass Ejections: Filaments and Sigmoids David McKenzie, Robert Leamon Karen Wilson, Zhona Tang, Anthony Running Wolf.

Similar presentations

Ads by Google