Phil and Harald ,
I assume that this email can reach both of you. if not, Nathan, could you forward to them?
I am following the discussion we had on using the secondary He to probe the outer heliosheath, a very interesting idea.
I repeat my comment that the observation shows only (possible) asymmetry of the sheath flow. This is a new (and single) piece of information. One should not use
it to resolve more than one unknown. Otherwise it is over-interpretation of observation, a common mistake in today’s data analyses. Any model that is used in the deriving the data cannot be used to confirmed the model unless there is independent validation
of the model. This was my comment of one can solve only one unknown from one equation.
With that said, I am following Phil’s idea. If there were no ISM magnetic field and the solar magnetic field, the flow around a body could be assumed as axial
symmetric. The asymmetry observed can be caused by one or both magnetic fields. As I mentioned during the discussion, the ISM field effect tends to enhance the flow around the nose in the two tangential directions perpendicular to the ISM field. therefore,
the asymmetry can be potentially used to infer the direction of the ISM field. in this case, one may not be able to infer the shape of the heliosphere. The solar magnetic field, on the other hand, tends to produce asymmetry relative to the dipole tilt, assuming
to be north-south. In which direction enhancement can be seen depends on the heliospheric model. If the heliosphere is fatter in the flank, enhancement should be seen in the azimuthal direction. if the heliosphere is skinny as shown in Merav’s simulation,
the enhancements should be in the latitudinal direction. The asymmetry can be compared with the these two field directions to determine which one is dominant. My feeling is that the ISM field most likely to be dominant.
Happy Holiday!
Paul
From: Nessc <nessc-bounces@lists.sr.unh.edu>
On Behalf Of Nathan Schwadron
Sent: Saturday, October 6, 2018 6:24 PM
To: NESSC NESSC <nessc@lists.sr.unh.edu>
Subject: [Nessc] NESSC meeting 27 on the outer heliosphere and the interstellar interaction
Announcing ..
NESSC meeting 27 on the outer heliosphere and the interstellar interaction
Monday November 19, 2018, 10 AM – 5 PM
U Mass Lowell, UCC Building, Room UCC-158
Parking is across in the Salem St. lot
Local Organizers:
Ofer Cohen <ofer_cohen at uml dot edu>
Paul Song <Paul_Song at uml dot edu>
NESSC Organizers:
Nathan Schwadron <nschwadron at unh dot edu>
Merav Opher <mopher at bu dot edu>
Web Organizer:
Ken Fairchild <Ken.Fairchild at unh dot edu>
Over the last decade, observations from the Voyager Satellites, the Interstellar Boundary Explorer, and Cassini/INCA have ushered in an era of discovery concerning the previously unknown properties of the global heliosphere and its interaction
with the local interstellar medium. Wide ranging observations including those of pickup ions, anomalous cosmic rays and suprathermal particles have significant implications for our understanding of global interstellar interactions.
This 27th meeting of the New England Space Science Consortium includes topics concerning the global heliosphere, the local interstellar medium, interstellar interactions, and related topics. As always, we invite all members of the New
England Space Science community to the meeting. And as in all meetings, we will include contributions from participants on wide-ranging topics.
Speakers Include:
Merav Opher (BU) - Global Heliosphere Simulations
Paul Song (UML) – Analytical Approach to Interstellar Boundary Structure
Adam Michaels (BU) – Simulations of the Global Heliosphere
Marc Kornbleuth (BU) – Simulations of the Global Heliosphere
Ofer Cohen (UML) – Modeling of the Heliosphere and Astrospheres
Fatemeh Rahmanifard (UNH) — Interstellar Neutral H from IBEX
Eberhard Moebius (UNH) — Interstellar Neutral Atoms from IBEX and IMAP
Marty Lee (UNH)— Analytical Model of Interstellar Neutral Atoms
Nathan Schwadron (UNH) — IBEX observations of the Ribbon and Globally Distributed Flux over 9 years
Harald Kucharek (UNH) – Secondary Neutral Atoms Observed by IBEX
Phil Isenberg (UNH) – Analytical Modeling of Secondary Neutral Atoms Observed by IBEX
CHeers
Nathan
Nathan Schwadron
Presidential Chair
Norman S. and Anna Marie Waite Professor
University of New Hampshire
Morse Hall - Room 350
8 College Road
Durham NH 03824
USA
(603) 862-3451