TY  - GEN
A1  - Park, J.
A1  - Lühr, H.
A1  - Stolle, Claudia
A1  - Malhotra, G.
A1  - Baker, J. B. H.
A1  - Buchert, Stephan
A1  - Gill, R.
T1  - Estimating along-track plasma drift speed from electron density measurements by the three Swarm satellites
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - Plasma convection in the high-latitude ionosphere provides important information about magnetosphere-ionosphere-thermosphere coupling. In this study we estimate the along-track component of plasma convection within and around the polar cap, using electron density profiles measured by the three Swarm satellites. The velocity values estimated from the two different satellite pairs agree with each other. In both hemispheres the estimated velocity is generally anti-sunward, especially for higher speeds. The obtained velocity is in qualitative agreement with Super Dual Auroral Radar Network data. Our method can supplement currently available instruments for ionospheric plasma velocity measurements, especially in cases where these traditional instruments suffer from their inherent limitations. Also, the method can be generalized to other satellite constellations carrying electron density probes.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 503 
KW  - ionosphere
KW  - plasma convection
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-408417
SN  - 1866-8372
IS  - 503
ER  - 
TY  - JOUR
A1  - Park, J.
A1  - Luehr, H.
A1  - Stolle, Claudia
A1  - Malhotra, G.
A1  - Baker, J. B. H.
A1  - Buchert, Stephan
A1  - Gill, R.
T1  - Estimating along-track plasma drift speed from electron density measurements by the three Swarm satellites
JF  - Annales geophysicae
N2  - Plasma convection in the high-latitude ionosphere provides important information about magnetosphere-ionosphere-thermosphere coupling. In this study we estimate the along-track component of plasma convection within and around the polar cap, using electron density profiles measured by the three Swarm satellites. The velocity values estimated from the two different satellite pairs agree with each other. In both hemispheres the estimated velocity is generally anti-sunward, especially for higher speeds. The obtained velocity is in qualitative agreement with Super Dual Auroral Radar Network data. Our method can supplement currently available instruments for ionospheric plasma velocity measurements, especially in cases where these traditional instruments suffer from their inherent limitations. Also, the method can be generalized to other satellite constellations carrying electron density probes.
KW  - Ionosphere
KW  - Plasma convection
Y1  - 2015
U6  - https://doi.org/10.5194/angeo-33-829-2015
SN  - 0992-7689
SN  - 1432-0576
VL  - 33
IS  - 7
SP  - 829
EP  - 835
PB  - Copernicus
CY  - Göttingen
ER  - 
TY  - JOUR
A1  - Schmidt, Robert W.
A1  - Kundic, T.
A1  - Pen, U.-L.
A1  - Wambsganß, Joachim
A1  - Bergeron, L. E.
A1  - Colley, W.
A1  - Corson, C.
A1  - Hastings, N. G.
A1  - Hoyes, T.
A1  - Long, D. C.
A1  - Loomis, K. A.
A1  - Malhotra, S.
A1  - Rhoads, J. E.
A1  - Stanek, K. Z.
T1  - Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998
N2  - We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (ga 100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Wozniak et al. cite{Wozniak00}). Based on observations obtained with the Apache Point Observatory 3.5-meter telescope, which is owned and operated by the Astrophysical Research Consortium.
Y1  - 2002
ER  -