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 Mars' peak electron density data used to make semi-empirical global model 12  Mars ionosphere model extends from 1964 through 2019 13  Mars ionospheric model available for upcoming NASA MAVEN mission 14 15 16 17 18 19 2 Abstract 20 Observations of the ionosphere of Mars have now reached a sufficient number to 21 begin discussions on how best to create(More)
  • Michael Mendillo, Johan Warell, Sanjay S Limaye, Jeerey Baumgardner, Ann Sprague, Jody K Wilson
  • 2001
We describe and compare two methods of short-exposure, high-deÿnition ground-based imaging of the planet Mercury. Two teams have recorded images of Mercury on diierent dates, from diierent locations, and with diierent observational and data reduction techniques. Both groups have achieved spatial resolutions of ¡ 250 km, and the same albedo features and(More)
—Solar-terrestrial interactions produce a rich variety of optical emissions in the Earth's upper atmosphere (100–1000 km). While ground based brightness measurements (i.e., column integrated photon density) provide an important diagnostic of these processes, the more interesting physics is in the associated volume emission rate distribution (i.e., photon(More)
[1] Ionospheric physics deals with the basic structure and variability of plasma within the upper atmospheres of the Earth and planets. Comparative studies foster both exploration and synthesis within diverse settings. In this paper we examine observations of the ionospheric profiles on Mars obtained on 9–27 March 1999 by the radio science experiment(More)
Optical diagnostic techniques have been applied to studies of equatorial aeronomy for nearly half a century. The use of scanning photometers and two-dimensional imagers to observe the spatial patterns associated with low-latitude emissions has been an increasingly used approach during the last few decades. In this paper we review the rationale for the use(More)
[1] Major geomagnetic storms produce dramatic gradients in the ionosphere's total electron content (TEC) that cause errors in GPS-dependent navigation systems, such as those used by the U. S. Coast Guard and the Federal Aviation Administration. Here we describe the first use of GPS signals to detect large-scale gradients in TEC very similar to those found(More)
  • Michael Mendillo, Clara Narvaez, Majd Matta, Marissa Vogt, Paul Mahaffy, Mehdi Benna +1 other
  • 2015
The Neutral Gas and Ion Mass Spectrometer (NGIMS) on the Mars Atmosphere and Volatile EvolutioN (MAVEN) satellite measured the distribution of thermal ions (2–150 amu) at ionospheric heights (~130–400 km) under midday conditions during the " Deep-Dip " orbit campaign from 17 to 22 April 2015. Assuming charge neutrality, we use the sum of NGIMS ions as a(More)
  • Arecibo, Jorge Chau, Jicamarca Cornell, Donald Farley, Larisa Cornell, Frank Goncharenko +39 others
  • 2009
Cornell University is an equal-opportunity, affirmative-action educator and employer. Acknowledgements The construction and operation of the upper atmospheric facilities have been tremendous engineering achievements, but the many contributions these facilities have made to the progress of science and technology could not have been realized without the(More)