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Here are regions where different kinds of waves are thought Here are regions where different kinds of waves are thought

Here are regions where different kinds of waves are thought - PowerPoint Presentation

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Here are regions where different kinds of waves are thought - PPT Presentation

The Van Allen Probes provide the first simultaneous multipoint measurements of these waves over broad regions Powerful radio and plasma waves are central to the acceleration and loss of radiation ID: 606142

van waves magnetic allen waves van allen magnetic storms central chorus probes radiation measurements particles acceleration regions belt triggered

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Presentation Transcript

Slide1

Here are regions where different kinds of waves are thought to persist

The Van Allen Probes provide the first simultaneous multipoint measurements of these waves over broad regions

Powerful radio and plasma waves are central

to

the

acceleration and loss of radiation

belt particles

1Slide2

Focus on chorus waves that we see on the Van Allen Probes

The Van Allen Probes provide the first simultaneous multipoint measurements of these waves over broad regions

Particles can “surf” on waves and gain or loose tremendous amounts of energy

Powerful radio and plasma waves are central

to

the

acceleration and loss of radiation

belt particles

2Slide3

Resonant Wave Acceleration

3Slide4

Some of these waves are striking and beautiful to both the eye --- Power level triggered waveform capture – 16 bit data – very clear!!

ChorusWaves4Slide5

--- and to the earPower level triggered waveform capture – 16 bit data – very clear!!

ChorusWaves

5Slide6

Waves at the edge of the radiation belts can last at least 5

hours during geomagnetic storms. This may be central to explaining how multi-MeV electrons are energized in the course of less than a day.

Now, unique 2-spacecraft measurements reveal many-hour persistence of Intense Low Frequency Electric Fields

> 5-hours

Van Allen Probe-A

Van Allen Probe-B

600 04

08 12 16 20 00Universal TimeOctober 13, 2012Slide7

Van Allen Probes high-cadence sampling reveals strong correlation between chorus waves and magnetic storms

This correlation may be central to the association of strong particle acceleration with some magnetic storms. But, why not all magnetic storms?

DST Magnetic Storm Parameter

Magnetic Storms

7Slide8

SummaryThe electric field and magnetic field measurements on the Van Allen Probes are the best ever made in the radiation belts.Two spacecraft is letting us see how long important waves persist – we’ve couldn’t do this before

Magnetospheric activity clearly is correlated with key wave features such as chorus.These findings may be central to when, where, and how radiation belt particles are accelerated. This is just the beginning!!8