interplanetary idp impact signature dust particle (idp...
TRANSCRIPT
Interplanetary Dust Particle (IDP) Signatures in Parker Solar Probe Data:
WHAT DOES IT MEAN!?
IDP Impact Signature
★ Asteroid and Comet remnants
★ High Velocity ( >20km/s )
★ Keplerian Orbit around Sun
★ Charged Particles
What is Interplanetary Dust (IDP)?
Radius Mass
IPD (identified in our data)
1 micron~1 * 10^(-
14)kg
Grain of Sand
60 micron~6 * 10^(-7)kg
Meteor Showers!
PerseidsCurrently activeActive from July 17th to August 26th, 2019 LOOK North after Midnight
Orionids Next period of activity: October 2nd, 2019 to November 7th, 2019
Leonids Next period of activity: November 6th, 2019 to November 30th, 2019
Thanks to www.amsmeteors.org:
We Can also Observe IPD through Spacecraft Data! ★Voyager
★Cassini★STEREO★MAVEN★WIND★MMS★ParkerSolarProbe
Why Parker Solar Probe is SO SPECIAL ?● Before PSP launched in August 2018 Dust within 0.3 AU of
the Sun had Never been Measured In-Situ!● Models for Dust Distribution at this Distance Vary by Orders
of Magnitude
1 AU = 215 Solar Radii
PSP will get as close as 9 Solar Radii
Data is collected near perihelion and retrieved when Earth’s position is right for a data dump
Closer to the SUN than EVER BEFORE!
Parker Solar Probe
FIELDS➔ 1 of 4 Instruments on Solar Probe➔ Designed to survey magnetic and electric fields➔ Not made to detect IDP!➔ Antennas measure change in electric
potential
Charged IDP particles HIT
the spacecraft, forming a
plasma cloudat contact point
IDP Impact Signature on 3 of the 4 channels
Impact Sequence
V4
V3
V2
V1
Electric Field Antennas
Electric Field Antennas
V5
• 10 Days of Data: 3/31/19 - 4/9/19
• 60 second Scan Windows
• Scan Windows are Shifted by Half
3/31 4/1 4/2 4/3 4/4 4/5 4/6 4/7 4/94/8
WINDOW
WINDOW 2
WINDOW 1 WINDOW 3
WINDOW 4
WINDOW 5
Finding Dust Spikes in the Data
See How the Algorithm Works on Waveform Data:
No Dust Impacts Only 1 spike identified with the algorithm Dust Impacts on ALL 4 Antennas
The Model
4/9/2019
3/31/2019
Data Dates: 03/31/2019:04/09/2019
End Goal:
Use the DATA
To Determine the Direction of the Dust
So We Can Test The Model
● Antenna closest to the impact site sees the highest amplitude at Impact Time
● Antenna closest to the impact site sees the highest amplitude at Impact Time
● Higher velocity impacts produce higher spikes
● Antenna closest to the impact site sees the highest amplitude at Impact Time
● Higher velocity impacts produce higher spikes● Comparing amplitudes on each antenna providescluesaboutthedirectionofdust:
● Antenna closest to the impact site sees the highest amplitude at Impact Time
● Higher velocity impacts produce higher spikes● Comparing amplitudes on each antenna providescluesaboutthedirectionofdust:○ when the spacecraft moves toward dust, impacts are bigger and more
frequent, when the spacecraft moves in the same direction as the dust, impacts are smaller and less frequent.
Bigger Spike Amplitude
Smaller Spike Amplitude
The Model: What we expect to see in the data
The Model Predicts the Highest Amplitudes on: • Ram-Side Antennas (V1_V4) near
Perihelion • Tail-Side Antenna (V5) near Last Day.• Includes Jupiter Family Comets and
Asteroids and Other Dust on near-circular Orbits
4/9/2019
3/31/2019
Data Dates: 03/31/2019:04/09/2019
Highest Amplitudes1) On Ram-Side Antennas (V1_V4) near
Perihelion (0.17)2) On Tail-Side Antenna (V5) near Last Day
(0.3)
The Data Mostly Supports the Model
**Size of Impact “Poof” Indicates Velocity of Impact
Conclusion:
• The Model for Jupiter family Comet and Asteroid Dust within
0.3 AU of the Sun is Supported by the Data in MOST Positions
Conclusion:
• The Model for Jupiter family Comet and Asteroid Dust within
0.3 AU of the Sun is Supported by the Data in MOST Positions
• The High Amplitudes on V5 at 0.2 pre-Perihelion might be due
to Dust Hitting the Sun Shield and Shifting the Electric
Potential of the Spacecraft
Conclusion:
• The Model for Jupiter family Comet and Asteroid Dust within
0.3 AU of the Sun is Supported by the Data in MOST Positions
• The High Amplitudes on V5 at 0.2 Pre-Perihelion might be due
to Dust Hitting the Sun Shield and Shifting the Electric
Potential of the Spacecraft
• Or…. There may be an unexplained Dust flux Hitting the
Spacecraft from the Tail at that location
ThanksTo:DavidMalaspina,DavidMalaspina,UniversityofColorado,Boulder
JameySzalay,PrincetonUniversityPetrPokorny,CatholicUniversity
StuartBale,BerkeleyJohnBonnell,Berkeley
ThierryDudok deWit,CNRS,UniversityofNewOrleansKeithGoetz,UniversityofMinnesota
PeterHarvey,BerkeleyRobertMacDowall,NASAMarcPulupa,Berkeley
ImageCredits:NASA:parkersolarprobe.jhuapl.edu