A5021111018- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Atmospheric chemistry and aerosols
- Geophysics and Gravity Measurements
- Atmospheric aerosols and clouds
- Particle physics theoretical and experimental studies
- Geomagnetism and Paleomagnetism Studies
- Particle Detector Development and Performance
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- Spaceflight effects on biology
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Atmospheric and Environmental Gas Dynamics
- Superconducting Materials and Applications
- Infrared Target Detection Methodologies
- Rocket and propulsion systems research
- Occupational and environmental lung diseases
- Aerospace Engineering and Energy Systems
- Advanced Optical Sensing Technologies
- Scientific Research and Discoveries
Stockholm University
2015-2024
Bolin Centre for Climate Research
2024
Canadian Space Agency
2009-2010
KTH Royal Institute of Technology
2003
Meteoric material entering Earth's atmosphere ablates in the mesosphere and is then expected to recondense into tiny so‐called “smoke particles.” These particles are thought be of great importance for middle phenomena like noctilucent clouds, polar mesospheric summer echoes, metal layers, heterogeneous chemistry. Commonly used one‐dimensional (1‐D) meteoric smoke profiles refer average global conditions yield order a thousand nanometer sized per cubic centimeter at mesopause, independent...
This work describes the first remote observations of meteoric smoke particles (MSPs) from satellite, by Solar Occultation For Ice Experiment (SOFIE) onboard Aeronomy in Mesosphere (AIM) platform. The measurements show a layer MSPs roughly 35 to 85 km altitude, and indicate seasonal cycle with reduced MSP abundance during polar summer. agree favorably model results, confirm that transport global meridional circulation causes dramatic reduction These new represent major advance our ability...
Abstract. Meteoroids entering the Earth's atmosphere experience strong deceleration and ablate, whereupon resulting material is believed to re-condense nanometre-size "smoke particles". These particles are thought be of great importance for many middle phenomena, such as noctilucent clouds, polar mesospheric summer echoes, metal layers, heterogeneous chemistry. The properties distribution meteoric smoke depend on poorly known or highly variable factors amount, composition velocity incoming...
Abstract. MATS (Mesospheric Airglow/Aerosol Tomography and Spectroscopy) is a Swedish satellite mission designed to investigate atmospheric gravity waves. In order observe wave patterns observes structures in the O2 band airglow (light emitted by oxygen molecules Mesosphere Lower Thermosphere), as well noctilucent clouds which form around Mesopause. The main instrument telescope that continuously captures high-resolution images of limb. Using tomographic analysis acquired images, can...
Monitoring the Earth Energy Imbalance (EEI) is of prime importance for a predictive understanding climate change. Furthermore, monitoring EEI gives an early indication on how well mankind doing in implementing Paris Climate Agreement. defined as small difference between incoming energy receives from Sun and outgoing lost by to space. The cumulated system, particularly oceans, due their substantial heat capacity, results global temperature rise. Currently best estimates absolute value EEI,...
Abstract. The MATS (Mesosphere, Airglow/Aerosol, Tomography & Spectroscopy) satellite was launched in November 2022 and began collecting scientific measurements of the Mesosphere Lower Thermosphere (MLT) early 2023. utilises a multichannel limb-viewing instrument designed to gather images across six distinct spectral bands, each selected capture atmospheric airglow from O2 band emissions as well light scattered by noctilucent clouds (NLC). This article presents comparison between...
Rocket‐borne observations of meteoric smoke particles (MSPs) are presented from three campaigns at polar latitudes (69°N) in September 2006, and the summers 2007 2008. MSPs detected using a novel technique based on photoelectron emission after stimulation by UV photons emitted xenon flashlamp. Resulting currents shown to be proportional particle volume density. results match model predictions qualitatively altitudes 65 85 km while measurements higher contaminated photoelectrons NO O 2 ( 1 Δ...
Abstract. A reservoir of Nitric Oxide (NO) in the lower thermosphere efficiently cools atmosphere after periods enhanced geomagnetic activity. Transport from this to stratosphere within winter polar vortex allows NO deplete ozone levels and thereby affect middle atmospheric heat budget. As more climate models resolve mesosphere (MLT) region, need for an improved representation related processes increases. This work presents a detailed comparison Antarctic MLT region between observations made...
Abstract Nitric oxide (NO) is produced by energetic particle precipitation (EPP) in the mesosphere‐lower thermosphere (MLT) region, and during polar winter, NO can descend to stratospheric altitudes where it destroys ozone. In this paper, we study general scenario, as opposed a case study, of production due particles auroral region. We first investigate relationship between two geomagnetic indices. The analysis indicates that electrojet index more suitable proxy for EPP‐produced than...
Abstract. Global three-dimensional data are a key to understanding gravity waves in the mesosphere and lower thermosphere. MATS (Mesospheric Airglow/Aerosol Tomography Spectroscopy) is new Swedish satellite mission that addresses this need. It applies space-borne limb imaging combination with tomographic spectroscopic analysis obtain wave on relevant spatial scales. Primary measurement targets O2 atmospheric band dayglow nightglow near infrared, sunlight scattered from noctilucent clouds...
Abstract. MASS (Mesospheric Aerosol Sampling Spectrometer) is a multichannel mass spectrometer for charged aerosol particles, which was flown from the Andøya Rocket Range, Norway, through NLC and PMSE on 3 August 2007 6 2007. The eight-channel analyzers provided first time simultaneous measurements of charge density residing particles in four ranges, corresponding to ice with radii <0.5 nm (including ions), 0.5–1 nm, 1–2 >3 (approximately). Positive negative were recorded separate...
Abstract Nitric oxide (NO) produced in the polar middle and upper atmosphere by energetic particle precipitation depletes ozone mesosphere and, following vertical transport winter vortex, stratosphere. Medium‐energy electron (MEE) ionization 30–1,000 keV electrons during geomagnetic storms may have a significant role mesospheric NO production. However, questions remain about relative importance of direct production MEE at altitudes ~60–90 km versus indirect originating from auroral above 90...
Abstract. A reservoir of nitric oxide (NO) in the lower thermosphere efficiently cools atmosphere after periods enhanced geomagnetic activity. Transport from this to stratosphere within winter polar vortex allows NO deplete ozone levels and thereby affect middle atmospheric heat budget. As more climate models resolve mesosphere (MLT) region, need for an improved representation NO-related processes increases. This work presents a detailed comparison Antarctic MLT region between observations...
The mesospheric polar vortex (MPV) plays a critical role in coupling the atmosphere-ionosphere system, so its accurate simulation is imperative for robust predictions of thermosphere and ionosphere. While stratospheric widely understood characterized, much less well-known observed, short-coming that must be addressed to improve predictability winter MPV facilitates top-down via communication high energy particle precipitation effects from down stratosphere, though details this mechanism are...
Abstract Noctilucent clouds are thin ice that appear around the summer polar mesopause. Recently, Cloud Imaging and Particle Size instrument on AIM satellite discovered nearly circular free regions within clouds—denoted as “ice voids.” The origin of these voids is not known. Their existence has so far only been reported by Size, which can give very limited information time scales involved. On 4 July 2010, such an void was registered our ground‐based camera taking images with 30‐s interval....
Abstract. We present in situ observations of mesospheric ice particles with a new particle detector which combines classical Faraday cup the active photoionization and subsequent detection photoelectrons. Our charged free electrons within decaying PMSE-layer reveal that presence is necessary but not sufficient condition for PMSE. That is, additional requirements like sufficiently large electron density – we here estimate to be on order ~100 cm−3 small scale structures (commonly assumed...
Abstract In April 2010, a coronal mass ejection and corotating interaction region on the Sun resulted in an energetic electron precipitation event Earth's atmosphere. We investigate direct indirect nitric oxide (NO) response to precipitation. By combining fluxes from Total Energy Detector Medium Proton Electron National Oceanic Atmospheric Administration's Polar‐orbiting Operational Environmental Satellites, we obtain continuous energy spectrum covering 1–750 keV. This corresponds electrons...
Abstract. In this study the properties of polar mesospheric clouds (PMCs) and background atmosphere in which they exist are studied using measurements from two instruments, OSIRIS SMR, on board Odin satellite. The data comes a set tomographic conducted by satellite during 2010 2011. expected ice mass density cloud frequency for conditions thermodynamic equilibrium, calculated temperature water vapour as measured compared to OSIRIS. We find that assuming equilibrium reproduces seasonal,...
Abstract Nitric oxide (NO) observations from the Solar Occultation for Ice Experiment and Student Oxide Explorer satellite instruments are investigated to determine relative importance of drivers short‐term NO variability. We study variations deseasonalized anomalies by removing a climatology, which explains between approximately 70% 90% total budget, relate them variability in geomagnetic activity solar radiation. Throughout lower thermosphere is dominant process at high latitudes, while...