Ingrid Mann - Academia.edu (original) (raw)

Papers by Ingrid Mann

The brightness of the solar F-corona along the ecliptic is calculated in the visual and near-infr... more The brightness of the solar F-corona along the ecliptic is calculated in the visual and near-infrared spectral range and the results are discussed with respect to future observations. It is shown that dust particles close to the Sun have a strong influence on the corona brightness, which enables their investigation by remote sensing experiments. Comparison of model calculations with the observations indicates that the zodiacal dust cloud remains mainly undisturbed up to the beginning of a dust-free zone that amounts to about 5 solar radii (R ⊙ ). Calculations of visual brightness and polarization indicate a change of particle properties for a solar distance smaller than 20R ⊙ , which has to be proven by future experiments

Atmospheric Chemistry and Physics, 2021

Abstract. We present a detailed investigation of the formation of an additional sodium density pe... more Abstract. We present a detailed investigation of the formation of an additional sodium density peak at altitudes of 79–85 km below the main peak of the sodium layer based on sodium lidar and airglow imager measurements made at Ramfjordmoen near Tromso, Norway, on the night of 19 December 2014. The airglow imager observations of OH emissions revealed four passing frontal systems that resembled mesospheric bores, which typically occur in ducting regions of the upper mesosphere. For about 1.5 h, the lower-altitude sodium peak had densities similar to that of the main peak of the layer around 90 km. The lower-altitude sodium peak weakened and disappeared soon after the fourth front had passed. The fourth front had weakened in intensity by the time it approached the region of lidar beams and disappeared soon afterwards. The column-integrated sodium densities increased gradually during the formation of the lower-altitude sodium peak. Temperatures measured with the lidar indicate that ther...

Proceedings of the International Astronomical Union, 2005

The Working Group was formed at the request of the Board of DivisionIII and approved by the IAU E... more The Working Group was formed at the request of the Board of DivisionIII and approved by the IAU Executive committee in March 2004. This was in recognition of the fact that discoveries in the Trans Neptunian region were repeatedly raising the question of “what is a planet”. The task of the WG was to investigate the options available and give indications of the level of support and opposition for each if more than one option was emerging.

Planetary and Space Science, 2007

... The submillimeter-wave subharmonic mixer utilizes integrated planar GaAs Schottky diodes in a... more ... The submillimeter-wave subharmonic mixer utilizes integrated planar GaAs Schottky diodes in a waveguide mount. Its local oscillator is a Gunn diode oscillator followed by a doubler with a planar diode varactor (Oswald et al., 1998). ...

Meteroids

Title: Radiation pressure on porous micrometeoroids. Authors: Kimura, H.; Mann, I. Publication: M... more Title: Radiation pressure on porous micrometeoroids. Authors: Kimura, H.; Mann, I. Publication: Meteroids 1998, editors: WJ Baggaley and V. Porubcan. ...

Astronomy and Astrophysics, 1993

We present the theoretical Doppler shifts of the scattered solar light due to the interplanetary ... more We present the theoretical Doppler shifts of the scattered solar light due to the interplanetary dust particles moving in elliptical orbits, taking into account both Doppler components δλ 1 due to the instantaneous rate of change of the light path between the Sun and the particle and δλ 2 between the particle and the Earth. It is found that our simple model for maximum shifts along the line of sight (LOS) leads to a favorable Doppler shifts-dependence on an elongation angle to explain the previous measurements (e.g. Fried 1978). An introduction of the δλ 1 component along with a decrease of the ratio of radiation pressure force to gravity on the particle with decreasing solar distance plays an important role in fitting the theoretical Doppler shifts to the measurements

Proceedings of the International Astronomical Union, 2015

After a little more than forty years of work related to the interplanetary plasma and the heliosp... more After a little more than forty years of work related to the interplanetary plasma and the heliosphere the IAU's Commission 49 was formally discontinued in 2015. The commission started its work when the first spacecraft were launched to measure the solar wind in–situ away from Earth orbit, both inward and outward from 1 AU. It now hands over its activities to a new commission during an era of space research when Voyager 1 measures in–situ the parameters of the local interstellar medium at the edge of the heliosphere. The commission will be succeeded by C.E3 with a similar area of responsibility but with more focused specific tasks that the community intends to address during the coming several years. This report includes a short description of the motivation for this commission and of the historical context. It then describes work from 2012 to 2015 during the present solar cycle 24 that has been the weakest in the space era so far. It gave rise to a large number of studies on sol...

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science, 1999

... Radiation pressure on dust aggregates in circumstellar disks. H. Kimura a , Corresponding Aut... more ... Radiation pressure on dust aggregates in circumstellar disks. H. Kimura a , Corresponding Author Contact Information and I. Mann a. ...

Astronomy and Astrophysics, 1993

Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science, 1999