N. Dresing - Academia.edu (original) (raw)

Papers by N. Dresing

Research paper thumbnail of The June 1st 2008 CME in the Interplanetary Medium

In this work we present a combined study/analysis of the counterpart of the CME of June 1st of 20... more In this work we present a combined study/analysis of the counterpart of the CME of June 1st of 2008 in the interplanetary medium. This event has been largely studied because of its peculiar initiation and its possible forecasting consequences for space weather. We show an in situ analysis of the CME in the interplanetary medium in order to shed some

Research paper thumbnail of THE SOLAR ENERGETIC PARTICLE EVENT ON 2013 APRIL 11: AN INVESTIGATION OF ITS SOLAR ORIGIN AND LONGITUDINAL SPREAD

The Astrophysical Journal, 2014

ABSTRACT

Research paper thumbnail of Multi-point observations of CIR-associated energetic particles during the 2008 solar minimum

... 3 where STB observed clear ICME sig-natures preceding the CIR [15] but, contrary to theAu-gus... more ... 3 where STB observed clear ICME sig-natures preceding the CIR [15] but, contrary to theAu-gust case, the ion increase was significantly lower when compared to STA. ... CIR-ICME interactions are frequently found at 1 AU. In some cases (eg Aug. ...

Research paper thumbnail of Compiling a STEREO SEP event list: 2007-2011

ABSTRACT The STEREO (Solar TErrestrial RElations Observatory) mission employs two nearly identica... more ABSTRACT The STEREO (Solar TErrestrial RElations Observatory) mission employs two nearly identical space-based observatories - one ahead of Earth in its orbit (STEREO-A: STA), the other trailing behind (STEREO-B: STB) aiming at providing the first-ever stereoscopic measurements of the Sun. STEREO recordings provide an unprecedented opportunity to identify the evolution of Solar Energetic Particles (SEPs) at different observing points in the heliosphere, which is expected to provide new insight on the physics of solar particle genesis, propagation and acceleration as well as on the properties of the interplanetary magnetic field that control these acceleration and propagation processes. In this work, two instruments onboard STEREO have been used in order to identify all SEP events observed within the rising phase of solar cycle 24 from 2007 to 2011, namely: the Low Energy Telescope (LET) and the Solar Electron Proton Telescope (SEPT). A scan over STEREO/LET protons within the energy range 6-10 MeV has been performed for each of the two STEREO spacecraft. We have tracked all enhancements that have been observed above the background level of this particular channel and cross checked with available lists on STEREO/ICMEs, SIRs and shocks as well as with the reported events in literature. Furthermore, parallel scanning of the STEREO/SEPT electrons in order to pinpoint the presence (or not) of an electron event has been performed in the energy range of 55-85 keV, for all of the aforementioned proton events, included in our lists. We provide the onset of all events for both protons and electrons, time-shifting analysis for near relativistic electrons which lead to the inferred solar release time and the relevant solar associations from radio spectrographs to GOES Soft X-rays and coronal mass ejections spotted by both SOHO/LASCO and STEREO Coronographs.

Research paper thumbnail of Anisotropies of wide-spread solar energetic electron events observed with STEREO and ACE

Research paper thumbnail of SEPServer Solar Energetic Particle event Catalogues at 1 AU based on STEREO recordings: selected solar cycle 24 SEP event analysis

Research paper thumbnail of Statistical survey of widely spread solar electron events observed with STEREO and ACE with special attention to anisotropies

Research paper thumbnail of SEPServer catalogues of solar energetic particle events at 1 AU based on STEREO recordings: 2007–2012

Astronomy & Astrophysics, 2014

The Solar Terrestrial Relations Observatory (STEREO) recordings provide an unprecedented opportun... more The Solar Terrestrial Relations Observatory (STEREO) recordings provide an unprecedented opportunity to study the evolution of solar energetic particle (SEP) events from different observation points in the heliosphere, allowing one to identify the effects of the properties of the interplanetary magnetic field (IMF) and solar wind structures on the interplanetary transport and acceleration of SEPs. Two catalogues based on STEREO recordings, have been compiled as a part of the SEPServer project, a three-year collaborative effort of eleven European partners funded under the Seventh Framework Programme of the European Union (FP7/SPACE). In particular, two instruments on board STEREO have been used to identify all SEP events observed within the descending phase of solar cycle 23 and the rising phase of solar cycle 24 from 2007 to 2012, namely: the Low Energy Telescope (LET) and the Solar Electron Proton Telescope (SEPT). A scan of STEREO/LET protons within the energy range 6-10 MeV has been performed for each of the two STEREO spacecraft. We have tracked all enhancements that have been observed above the background level of this particular channel and cross-checked with available lists of interplanetary coronal mass ejections (ICMEs), stream interaction regions (SIRs), and shocks, as well as with the reported events in literature. Furthermore, parallel scanning of the STEREO near relativistic electrons has been performed in order to pinpoint the presence (or absence) of an electron event in the energy range of 55-85 keV, for all of the aforementioned proton events included in our lists. We provide the onset and peak time as well as the peak value of all events for both protons and electrons, the relevant solar associations in terms of electromagnetic emissions, soft and hard X-rays (SXRs and HXRs). Finally, a subset of events with clear recordings at both STEREO spacecraft is presented together with the parent solar events of these multispacecraft SEP events.

Research paper thumbnail of CIRCUMSOLAR ENERGETIC PARTICLE DISTRIBUTION ON 2011 NOVEMBER 3

The Astrophysical Journal, 2015

ABSTRACT Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observ... more ABSTRACT Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observed an energetic particle flux enhancement. Based on the analysis of in situ plasma and particle observations, their correlation with remote sensing observations, and an interplanetary transport model, we conclude that the particle increases observed at multiple locations had a common single-source active region and the energetic particles filled a very broad region around the Sun. The active region was located at the solar backside (as seen from Earth) and was the source of a large flare, a fast and wide coronal mass ejection, and an EIT wave, accompanied by type II and type III radio emission. In contrast to previous solar energetic particle events showing broad longitudinal spread, this event showed clear particle anisotropies at three widely separated observation points at 1 AU, suggesting direct particle injection close to the magnetic footpoint of each spacecraft, lasting for several hours. We discuss these observations and the possible scenarios explaining the extremely broad particle spread for this event.

Research paper thumbnail of Multi-point observations of Co-rotating Interaction Regions

… 2010, held 2-7 May …, 2010

During the recent solar minimum, Co-rotating Interaction Regions (CIRs) and their associated recu... more During the recent solar minimum, Co-rotating Interaction Regions (CIRs) and their associated recurrent ion increases have been regularly observed in the inner heliosphere. The multi-point observations provided by STEREO and near-Earth spacecraft revealed ...

Research paper thumbnail of The June 1st 2008 CME in the Interplanetary Medium

In this work we present a combined study/analysis of the counterpart of the CME of June 1st of 20... more In this work we present a combined study/analysis of the counterpart of the CME of June 1st of 2008 in the interplanetary medium. This event has been largely studied because of its peculiar initiation and its possible forecasting consequences for space weather. We show an in situ analysis of the CME in the interplanetary medium in order to shed some

Research paper thumbnail of THE SOLAR ENERGETIC PARTICLE EVENT ON 2013 APRIL 11: AN INVESTIGATION OF ITS SOLAR ORIGIN AND LONGITUDINAL SPREAD

The Astrophysical Journal, 2014

ABSTRACT

Research paper thumbnail of Multi-point observations of CIR-associated energetic particles during the 2008 solar minimum

... 3 where STB observed clear ICME sig-natures preceding the CIR [15] but, contrary to theAu-gus... more ... 3 where STB observed clear ICME sig-natures preceding the CIR [15] but, contrary to theAu-gust case, the ion increase was significantly lower when compared to STA. ... CIR-ICME interactions are frequently found at 1 AU. In some cases (eg Aug. ...

Research paper thumbnail of Compiling a STEREO SEP event list: 2007-2011

ABSTRACT The STEREO (Solar TErrestrial RElations Observatory) mission employs two nearly identica... more ABSTRACT The STEREO (Solar TErrestrial RElations Observatory) mission employs two nearly identical space-based observatories - one ahead of Earth in its orbit (STEREO-A: STA), the other trailing behind (STEREO-B: STB) aiming at providing the first-ever stereoscopic measurements of the Sun. STEREO recordings provide an unprecedented opportunity to identify the evolution of Solar Energetic Particles (SEPs) at different observing points in the heliosphere, which is expected to provide new insight on the physics of solar particle genesis, propagation and acceleration as well as on the properties of the interplanetary magnetic field that control these acceleration and propagation processes. In this work, two instruments onboard STEREO have been used in order to identify all SEP events observed within the rising phase of solar cycle 24 from 2007 to 2011, namely: the Low Energy Telescope (LET) and the Solar Electron Proton Telescope (SEPT). A scan over STEREO/LET protons within the energy range 6-10 MeV has been performed for each of the two STEREO spacecraft. We have tracked all enhancements that have been observed above the background level of this particular channel and cross checked with available lists on STEREO/ICMEs, SIRs and shocks as well as with the reported events in literature. Furthermore, parallel scanning of the STEREO/SEPT electrons in order to pinpoint the presence (or not) of an electron event has been performed in the energy range of 55-85 keV, for all of the aforementioned proton events, included in our lists. We provide the onset of all events for both protons and electrons, time-shifting analysis for near relativistic electrons which lead to the inferred solar release time and the relevant solar associations from radio spectrographs to GOES Soft X-rays and coronal mass ejections spotted by both SOHO/LASCO and STEREO Coronographs.

Research paper thumbnail of Anisotropies of wide-spread solar energetic electron events observed with STEREO and ACE

Research paper thumbnail of SEPServer Solar Energetic Particle event Catalogues at 1 AU based on STEREO recordings: selected solar cycle 24 SEP event analysis

Research paper thumbnail of Statistical survey of widely spread solar electron events observed with STEREO and ACE with special attention to anisotropies

Research paper thumbnail of SEPServer catalogues of solar energetic particle events at 1 AU based on STEREO recordings: 2007–2012

Astronomy & Astrophysics, 2014

The Solar Terrestrial Relations Observatory (STEREO) recordings provide an unprecedented opportun... more The Solar Terrestrial Relations Observatory (STEREO) recordings provide an unprecedented opportunity to study the evolution of solar energetic particle (SEP) events from different observation points in the heliosphere, allowing one to identify the effects of the properties of the interplanetary magnetic field (IMF) and solar wind structures on the interplanetary transport and acceleration of SEPs. Two catalogues based on STEREO recordings, have been compiled as a part of the SEPServer project, a three-year collaborative effort of eleven European partners funded under the Seventh Framework Programme of the European Union (FP7/SPACE). In particular, two instruments on board STEREO have been used to identify all SEP events observed within the descending phase of solar cycle 23 and the rising phase of solar cycle 24 from 2007 to 2012, namely: the Low Energy Telescope (LET) and the Solar Electron Proton Telescope (SEPT). A scan of STEREO/LET protons within the energy range 6-10 MeV has been performed for each of the two STEREO spacecraft. We have tracked all enhancements that have been observed above the background level of this particular channel and cross-checked with available lists of interplanetary coronal mass ejections (ICMEs), stream interaction regions (SIRs), and shocks, as well as with the reported events in literature. Furthermore, parallel scanning of the STEREO near relativistic electrons has been performed in order to pinpoint the presence (or absence) of an electron event in the energy range of 55-85 keV, for all of the aforementioned proton events included in our lists. We provide the onset and peak time as well as the peak value of all events for both protons and electrons, the relevant solar associations in terms of electromagnetic emissions, soft and hard X-rays (SXRs and HXRs). Finally, a subset of events with clear recordings at both STEREO spacecraft is presented together with the parent solar events of these multispacecraft SEP events.

Research paper thumbnail of CIRCUMSOLAR ENERGETIC PARTICLE DISTRIBUTION ON 2011 NOVEMBER 3

The Astrophysical Journal, 2015

ABSTRACT Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observ... more ABSTRACT Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observed an energetic particle flux enhancement. Based on the analysis of in situ plasma and particle observations, their correlation with remote sensing observations, and an interplanetary transport model, we conclude that the particle increases observed at multiple locations had a common single-source active region and the energetic particles filled a very broad region around the Sun. The active region was located at the solar backside (as seen from Earth) and was the source of a large flare, a fast and wide coronal mass ejection, and an EIT wave, accompanied by type II and type III radio emission. In contrast to previous solar energetic particle events showing broad longitudinal spread, this event showed clear particle anisotropies at three widely separated observation points at 1 AU, suggesting direct particle injection close to the magnetic footpoint of each spacecraft, lasting for several hours. We discuss these observations and the possible scenarios explaining the extremely broad particle spread for this event.

Research paper thumbnail of Multi-point observations of Co-rotating Interaction Regions

… 2010, held 2-7 May …, 2010

During the recent solar minimum, Co-rotating Interaction Regions (CIRs) and their associated recu... more During the recent solar minimum, Co-rotating Interaction Regions (CIRs) and their associated recurrent ion increases have been regularly observed in the inner heliosphere. The multi-point observations provided by STEREO and near-Earth spacecraft revealed ...