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We have used corresponding marker features in the intensity vs. time profile of termination shock particles coming from within the heliosheath and also 5-12 MeV electrons which are coming from beyond the heliopause that are both observed at…

空间物理 · 物理学 2014-09-29 W. R. Webber , D. S. Intriligator

Voyager spacecraft (V1 and V2) provide unique in situ measurements of perturbations propagating beyond the heliopause through the very local interstellar medium (VLISM), including the shocks and pressure fronts whose origin is debated. In…

The recovery of cosmic ray He nuclei of energy ~150-250 MeV/nuc in solar cycle #23 from 2004 to 2010 has been followed at the Earth using IMP and ACE data and at V2 between 74-92 AU and also at V1 beyond the heliospheric termination shock…

地球物理 · 物理学 2012-03-21 W. R. Webber , F. B. McDonald , P. R. Higbie , B. Heikkila

A heliospheric termination shock (HTS) surrounds our solar system at approximately 100 astronomical units from the Sun, where the expanding solar wind (SW) is compressed and heated before encountering the interstellar medium.…

太阳与恒星天体物理 · 物理学 2025-01-28 E. J. Zirnstein , R. Kumar , B. L. Shrestha , P. Swaczyna , M. A. Dayeh , J. Heerikhuisen , J. R. Szalay

We have determined the solar modulation potential, phi, vs. time that is observed at Voyager 1 and 2 from measurements of the H and He nuclei intensities at a common energy of 250 MeVnuc. The H nuclei have a rigidity 0.7 GV, the He nuclei…

空间物理 · 物理学 2017-06-12 W. R. Webber , E. C. Stone , A. C. Cummings , B. Heikkila , N. Lal

There was an expectation that the magnetic field direction would rotate dramatically across the heliopause (HP). This rotation was used as one of the criteria to determine if Voyager 1 (V1) had crossed the HP. Recently the Voyager team…

太阳与恒星天体物理 · 物理学 2015-06-17 Merav Opher , James F. Drake

The recovery of cosmic ray protons of energy ~150-250 MeV/nuc in solar cycle #23 from 2004 to 2010 has been followed at the Earth using IMP, ACE and balloon data and also at V2 between 74-92 AU and at V1 beyond the heliospheric termination…

地球物理 · 物理学 2011-11-11 W. R. Webber , F. B. McDonald , P. R. Higbie , B. Heikkila

In mid-2012, a GMIR observed by Voyager 2 crossed through the heliosheath and collided with the heliopause, generating a pressure pulse that propagated into the very local interstellar medium. The effects of the transmitted wave were seen…

空间物理 · 物理学 2019-10-03 Jamie S. Rankin , David J. McComas , John D. Richardson , Nathan A. Schwadron

An analytic model of the heliosheath (HS) between the termination shock (TS) and the heliopause (HP) is developed in the limit in which the interstellar flow and magnetic field are neglected. The heliosphere in this limit is axisymmetric…

太阳与恒星天体物理 · 物理学 2015-08-06 J. F. Drake , M. Swisdak , M. Opher

Voyager 1 has explored the solar wind-interstellar medium interaction region between the Terminal Shock and the Heliopause, following the intensity distribution of the shock accelerated anomalous component of cosmic rays in the MeV energy…

太阳与恒星天体物理 · 物理学 2015-06-16 J. J. Quenby , W. R. Webber

We have examined features in the structure of the heliosheath using the fine scale time variations of termination shock particles (TSP) between ~0.5 - 20 MeV and electrons between 2.5-14 MeV measured by the CRS instrument as the V2…

The shape of the solar wind bubble within the interstellar medium, the so-called heliosphere, has been explored over six decades. As the Sun moves through the surrounding partially-ionized medium, neutral hydrogen atoms penetrate the…

空间物理 · 物理学 2019-02-18 Merav Opher , Abraham Loeb , James Drake , Gabor Toth

The picture of the heliopause (HP) -- the boundary between the domains of the sun and the local interstellar medium (LISM) -- as a pristine interface with a large rotation in the magnetic field fails to describe recent Voyager 1 (V1)…

太阳与恒星天体物理 · 物理学 2015-06-16 M. Swisdak , J. F. Drake , M. Opher

Using data from the Voyager 1 and 2 CRS telescopes available on the web through the end of 2014 we have studied the intensity variations of termination shock H nuclei and anomalous cosmic ray H and He nuclei as a function of radial…

空间物理 · 物理学 2015-02-05 W. R. Webber , D. S. Intriligator

In 2012, Voyager 1 crossed the heliopause, becoming the first human-made object to exit the solar system. This milestone signifies the beginning of an important new era for local interstellar medium (LISM) exploration. We present…

星系天体物理 · 物理学 2018-06-22 Julia Zachary , Seth Redfield , Jeffrey L. Linsky , Brian E. Wood

There is currently a controversy as to whether Voyager 1 has already crossed the Termination Shock, the first boundary of the Heliosphere. The region between the Termination Shock and the Heliopause, the Helisheath, is one of the most…

天体物理学 · 物理学 2009-11-10 M. Opher , P. C. Liewer , M. Velli , T. I. Gombosi , W. Manchester , D. L. DeZeeuw , G. Toth , I. Sokolov

We report "ground truth", 28-3500 keV in-situ ion and 5.2-55 keV remotely sensed ENA measurements from Voyager 2/Low Energy Charged Particle (LECP) detector and Cassini/Ion and Neutral Camera (INCA), respectively, that assess the components…

空间物理 · 物理学 2019-08-21 K. Dialynas , S. M. Krimigis , R. B. Decker , D. G. Mitchell

Since crossing the heliopause on August 25, 2012, Voyager 1 observed reductions in galactic cosmic ray count rates caused by a time-varying depletion of particles with pitch angles near 90-deg, while intensities of particles with other…

空间物理 · 物理学 2019-05-30 J. S. Rankin , E. C. Stone , A. C. Cummings , D. J. McComas , N. Lal , B. C. Heikkila

The paper describes differences in the intensity as a function of radial distance of anomalous and galactic cosmic rays in the N-S heliosheaths as observed by the Voyager 1 and 2 spacecraft respectively. The anomalous cosmic ray (ACR)…

空间物理 · 物理学 2014-03-14 W. R. Webber , D. S. Intriligator

Since its formation 4.6 billion years ago, our solar system has most likely crossed numerous magnetized interstellar clouds and bubbles of different sizes and contents on its path through the Milky Way. Having a reference model for how the…

太阳与恒星天体物理 · 物理学 2012-10-03 Lotfi Ben-Jaffel , Romana Ratkiewicz
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