TY - JOUR
T1 - Nitrogen in solar energetic particles
T2 - Isotopically distinct from solar wind
AU - Mathew, K. J.
AU - Kerridge, J. F.
AU - Marti, K.
PY - 1999/12/1
Y1 - 1999/12/1
N2 - Stepwise etching of lunar soil ilmenite grains reveals that the 15N/14N ratio of implanted nitrogen decreases with increasing implantation depth within the ilmenite grains, i.e., with increasing energy of implantation. These results show that N derived from solar energetic particles, N(SEP), is enriched in the light isotope, 14N, relative to solar-wind nitrogen, N(SW). This is in striking contrast to the neon isotopic record: Ne(SEP) is depleted in the light isotope, 20Ne, relative to Ne(SW). These data suggest either distinct signatures in the respective solar source regions, or fractionation in the acceleration mechanism(s). However, the observed opposite fractionation trends for light N and Ne isotopes do not agree with model predictions.
AB - Stepwise etching of lunar soil ilmenite grains reveals that the 15N/14N ratio of implanted nitrogen decreases with increasing implantation depth within the ilmenite grains, i.e., with increasing energy of implantation. These results show that N derived from solar energetic particles, N(SEP), is enriched in the light isotope, 14N, relative to solar-wind nitrogen, N(SW). This is in striking contrast to the neon isotopic record: Ne(SEP) is depleted in the light isotope, 20Ne, relative to Ne(SW). These data suggest either distinct signatures in the respective solar source regions, or fractionation in the acceleration mechanism(s). However, the observed opposite fractionation trends for light N and Ne isotopes do not agree with model predictions.
UR - http://www.scopus.com/inward/record.url?scp=0033489802&partnerID=8YFLogxK
U2 - 10.1029/1998GL900181
DO - 10.1029/1998GL900181
M3 - Article
AN - SCOPUS:0033489802
SN - 0094-8276
VL - 25
SP - 4293
EP - 4296
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 23
ER -