New scientific paper published
(The source regions of whistlers),
reflecting the work of David Koronczay and Janos Lichtenberger.
Whistlers are electromagnetic pulses generated by lightning strokes,
traveling along the geomagnetic field lines and returning to the
ground on the opposite hemisphere. Although the theory of propagation
has been known for long, and supported by lines of indirect evidence,
a part of the puzzle was still missing before this paper.
Earlier studies aimed at determining the geographic distribution
of lightning strokes that originated whistlers detected at a a given location
gave contradicting results. Our new result, based on a new
analysis method and a significantly larger dataset (including eighty
million whistlers and two billion localized lightning strokes),
demonstrates that generating lightning strokes are located
around the geomagnetic conjugate points of the respective
stations, in agreement with expectations from theory.
New scientific paper
VLF Transmitters as Tools for Monitoring the Plasmasphere) by researchers of
the ELTE Space Research Group. Our results contributes to the validation and
calibration of the algorithms in the AWDANet global whistler inversion network.
At the same time, the paper presents a new method for satellite-based plasma
9 October, 2018
Space Research Day at the Hungarian Academy of Sciences, organized by MANT.
Our research project carried out in the framework of an ESA PECS grant has finished. The
work included using in-situ satellite data to calibrate the whistler inversion based plasma density values in the AWDANet network.
We carried out phenological and meteorological studies for the Carpathian basin based on the NDVI3g database (Tucker
et al. 2014). We created an improved version, adjusted to MODIS data, and made it publicly available
For more details, see: Kern et al., 2016
19-24 September, 2016
Members of the ELTE Space Research Group took part in the
VII. VLF/ELF Remote Sensing of the Ionosphere and Magnetosphere
thematic conference in Hermanus, South Africa.
Our PhD student Lilla Juhasz PhD student spent 2 months at the bi-annual
Los Alamos Space Weather Summer School, under the supervision of Reinder Friedl, studying the
time depentent sensitivity of the HOPE instrument onboard the
Van Allen Probes satellite.
The results of the work are summarized in a report.
Expanding borders (Tudomány születik,
available in Hungarian) a follow-up title to A Science is Borne,
has been published, continuing
interviews with space researchers active in Hungary
in the 1970's and 1980's. The book
includes interview with Janos Lichtenberger, head of the
ELTE Space Research Group, and recounts the
work of the late Gyorgy Tarcsai and Laszlo Bognar.
was organized by the Hungarian Astronautical Society.
In the framework of an ESA PECS grant, our colleague Janos Lichtenberger installed a new station
at the Belgian Antarctic Princess Elisabeth base,
extending the AWDANet global network for plasmasphere monitoring.
Continuous recording and whistler detection has started at the station.
Photo gallery by our colleague Fabien Darrouzet: aeronomie.be
Anders Jorgensen, researcher at New Mexico Tech,
spent part of his sabbatical at our group. His research area includes the data assimilative modeling of
the plasmasphere. Our collaboration in this field started with the PLASMON
Koronczay et al.: Data assimilation with plasmaspheric density measurements from VLF whistlers: preliminary results. 12th International School/Symposium for Space Simulations. 2015, Prague, Czech Republic.
Final meeting of the PLASMON collaboration, held
at the House of Professors, ELTE and at Salgó Hotel
in Somoskőújfalu. The end of the project coincided with the official start of
the real time operation of the AWDANet network.
Interesting research published in
Geophysical Research Letters (doi:10.1002/2014GL060332, 2014).
Caire Antel South African student and our colleague from New Zealand, Craig Rodgers,
showed that some of the whistlers recorded by the AWDANet network (operated by
the ELTE Space Research Group), at its station in Dunedin, New Zealand, are
generated by volcanic lightning.
New book is published under the title A science is borne (Tudomány születik,
available in Hungarian)
about space research in Hungary between 1957 and 1980. The author
interviewed researchers active in the period, including dr. Csaba Ferencz, member
of ELTE Space Research Group.
Janos Lichtenberger and David Koronczay finished the repair of the AWDANet station
in Humain, Belgium. This receiver station showed some anomalies, some of which originated
from other electronic equipment adjacent to our receiver. It is assumed that nearby
industrial activity, such as mining, can be the source of further disruptions,
however, these could not be identified during several attempts.
Nevertheless, the updated station is now a functional part of the
network, extending it in Europe.
The head of our group, Janos Lichtenberger participated at the 6. VERSIM (VLF/ELF Remote Sensing of Ionospheres and Magnetospheres)
conference in Otago, New Zealand. Members of the ELTE Space Research Group
regularly participate at the bi-annual VERSIM workshop.