P. Serlemitsos

Goddard Space Flight Center

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E. A. Boldt

Goddard Space Flight Center

R. F. Mushotzky

Joint Space Science Institute

J. H. Swank

Goddard Space Flight Center

R. E. Rothschild

University of California, San Diego

Robert Petre

Weatherford (Switzerland)

Takashi Okajima

Goddard Space Flight Center

Yang Soong

Goddard Space Flight Center

T. R. Kallman

Goddard Space Flight Center

S. Holt

Abu Dhabi Health Services

K. Jahoda

Goddard Space Flight Center

Cooperative Institutions

Goddard Space Flight Center

Deleted Institution

University of Maryland, College Park

Massachusetts Institute of Technology

Institute of Space and Astronautical Science

Kavli Institute for Particle Astrophysics and Cosmology

Japan Aerospace Exploration Agency

University of Maryland, Baltimore County

Center for Astrophysics Harvard & Smithsonian

California Institute of Technology

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Low-energy electrons in the dark magnetosphere

Journal of Geophysical Research Atmospheres (1966)

P. Serlemitsos

A number of observations on satellite data are presented which pertain to low energy (∼100 key) electrons in the dark magnetosphere and which were obtained with a scintillation counter aboard Explorer 14. It is shown that the trapping region near the magnetic midnight meridian and at low magnetic latitudes extends on quiet days to distances in excess of 12 Re. The extent of this region and the morphology of electrons near its outer boundary are shown to have a pronounced dependence on geomagnetic activity. Electrons trapped in the distant geomagnetic field are shown to have a pitch-angle distribution whose maximum is along the field lines and which undergoes a 90° change through a region of near Isotropic electron fluxes, generally located at about 7 to 8 Re, near the equatorial plane. Evidence is presented to the effect that the distant field as deduced from the anisotropic features of trapped electrons is highly distorted, having an almost radial appearance and showing a tendency to align itself along the earth-sun direction. A case has been found in which trapped electrons in this region displayed a net flow away from the earth over a 3-minute interval. Finally, it is shown that electron fluxes outside the trapping region and specifically in the tail of the magnetosphere are essentially isotropic, that they appear in pulse-like events clustered around the geomagnetic equatorial plane (at least up to 16 Re), and that the frequency of their occurrence decreases with geocentric distance.

Pitch angle

Field line

Ring current

Geomagnetic pole

10.1029/jz071i001p00061

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Citations (47)

Multiwavelength Studies of HER X-1

S. D. Vrtilek J. Truêmper P. Kahabka W. Voges K. Dennerl

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White Paper on GEMS Study of Polarized X-rays from Neutron Stars

arXiv (Cornell University) (2013)

Pranab Ghosh Julian H. Krolik P. Serlemitsos A. K. Harding T. R. Kallman

We examine the expected X-ray polarization properties of neutron-star X-ray sources of various types, e.g., accretion and rotation powered pulsars, magnetars, and low-mass X-ray binaries. We summarize the model calculations leading to these expected properties. We describe how a comparison of these with their observed properties, as inferred from GEMS data, will probe the essential dynamical, electromagnetic, plasma, and emission processes in neutron-star binaries, discriminate between models of these processes, and constrain model parameters. An exciting goal is the first observational demonstration in this context of the existence of vacuum resonance, a fundamental quantum electrodynamical phenomenon first described in the 1930s.

White (mutation)

White paper

10.48550/arxiv.1301.5514

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Citations (6)

The Spectrum of Cyg X-1 From OSO-8; November 7 to November 24, 1975

Bulletin of the American Astronomical Society (1976)

P. Serlemitsos E. A. Boldt S. Holt R. E. Rothschild R. H. Becker

Broad spectrum

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4U 0115+634 in outburst

ATel (2004)

J. Tueller S. D. Barthelmy H. Krimm Takashi Okajima Scott M. Owens

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The Cosmic X-Ray Background: II. Fluctuations

E. A. Boldt A. R. Stottlemyer R. Schafer S. Holt R. Rothschild

X-ray background

Background radiation

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White Paper for Blazar Observations with a GEMS-like X-ray Polarimetry Mission

arXiv (Cornell University) (2013)

H. Krawczynski L. Angelini Matthew G. Baring W. H. Baumgartner K. Black

In this document, we describe the scientific potential of blazar observations with a X-ray polarimetry mission like GEMS (Gravity and Extreme Magnetism SMEX). We describe five blazar science investigations that such a mission would enable: (i) the structure and the role of magnetic fields in AGN jets, (ii) analysis of the polarization of the synchrotron X-ray emission from AGN jets, (iii) discrimination between synchrotron self-Compton and external Compton models for blazars with inverse Compton emission in the X-ray band, (iv) a precision study of the polarization properties of the X-ray emission from Cen-A, (v) tests of Lorentz Invariance based on X-ray polarimetric observations of blazars. We conclude with a discussion of a straw man observation program and recommended accompanying multiwavelength observations.

10.48550/arxiv.1303.7158

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Citations (6)

Solving the mystery of the X-ray periodicity in the Seyfert galaxy NGC6814

Nature (1993)

G. M. Madejski Chris Done T. J. Turner R. F. Mushotzky P. Serlemitsos

ROSAT

Black hole (networking)

10.1038/365626a0

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Citations (35)

Low-Energy Electrons and the Magnetosphere.