a) Measured electron density at 200 km from Sondrestrom ISR

b) OI 630.0 nm dayglow / twilight glow observations from Sondrestrom

First measurements of sunlit cusp in redline oxygen emissions from ground.
Detection of daytime arcs in HIRISE data.
Observation of cross polar arcs/theta aurora during daytime.
Pallamraju, D., J.Baumgardner, S.Chakrabarti and T. R. Pedersen, "Simultaneous ground-based observations of an auroral arc in daytime O I 630.0 nm emission and by incoherent scatter radar," J.Geophys. Res., 106,5543-5549, 2001.
Pallamraju, D., J.Baumgardnerand S.Chakrabarti, "HIRISE: A ground-based High Resolution Imaging Spectrograph using Echellegrating for measuring daytime airglow and auroral emissions," J.Atmos. Solar-Terr. Phys., 64 , 1581-1587, 2002.
Pallamraju, D.,S.Chakrabarti, J.Baumgardner, and T. R. Pedersen, "First observations of sunlit cusp in OI 630.0 nm emissions using ground-based HIRISE instrument from Sondrestromfjord," 34th Committee on Space Research (COSPAR) Scientific Assembly, Houston, TX, USA, 10-19 October, 2002.